CN114970796B - Graphene film RFID label capable of being heated along with microwave oven and preparation method thereof - Google Patents

Graphene film RFID label capable of being heated along with microwave oven and preparation method thereof Download PDF

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Publication number
CN114970796B
CN114970796B CN202210923648.0A CN202210923648A CN114970796B CN 114970796 B CN114970796 B CN 114970796B CN 202210923648 A CN202210923648 A CN 202210923648A CN 114970796 B CN114970796 B CN 114970796B
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graphene film
antenna
chip
graphene
rfid tag
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CN114970796A (en
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何大平
张博涵
刘雪玉
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Sanya Hanene Graphene Technology Research Institute Co ltd
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Sanya Hanene Graphene Technology Research Institute Co ltd
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    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
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    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
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    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
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    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
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    • G06K19/07758—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
    • G06K19/0776—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag the adhering arrangement being a layer of adhesive, so that the record carrier can function as a sticker
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
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    • G06K19/07775—Antenna details the antenna being on-chip
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2519/00—Labels, badges
    • B32B2519/02—RFID tags
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2204/00—Structure or properties of graphene
    • C01B2204/20—Graphene characterized by its properties
    • C01B2204/22—Electronic properties
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2204/00—Structure or properties of graphene
    • C01B2204/20—Graphene characterized by its properties
    • C01B2204/24—Thermal properties
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P20/10—Process efficiency

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Abstract

The invention provides a graphene film RFID label capable of being heated along with a microwave oven and a preparation method thereof. The self-assembled graphene film with high conductivity, high thermal conductivity and high ignition point is adopted to replace conventional metals such as copper and aluminum to serve as an antenna material, and an RFID tag antenna form meeting the application requirements of different frequency bands is designed and manufactured; selecting a high molecular polymer as a base material, covering a layer of high-temperature-resistant protective glue above the chip after the chip is bound with the antenna port, and adhering the prepared label to the outer surface or the inner side of the article package to carry a series of data information of the article and provide intelligent package for the article; the accumulation of charges on the metal antenna conductor is dispersed or inhibited without introducing an additional structure, the cost of the tag is reduced, the safety performance is improved, other cooking modes of the tag along with articles in a microwave oven for heating, unfreezing and the like are realized, and the related operation process of the microwave oven is further controlled.

Description

Graphene film RFID label capable of being heated along with microwave oven and preparation method thereof
Technical Field
The invention relates to the technical field of radio frequency identification, in particular to a graphene film RFID tag capable of being heated along with a microwave oven and a preparation method thereof.
Background
The RFID technology belongs to the sensing layer of the Internet of things, and is an automatic identification technology for rapidly, efficiently and accurately acquiring and processing the entity information of an article in a non-contact manner in real time without establishing mechanical or optical contact between an identification system and a specific target. At present, RFID tags are widely applied to the fields of logistics monitoring, warehousing and checking, access control management, smart home, unmanned retail, medical health and the like, and are combined with the core technologies of the Internet of things such as sensor technology and positioning technology, so that the real mutual connection of everything is realized. Along with the continuous popularization of the application of the RFID technology, the application field of the RFID label is gradually enlarged, and the intelligent package of the article is very important in the aspects of strengthening the safety supervision of the article, improving the quality of the article, facilitating the use of the article and the like. However, the commercial tag made of metal material cannot be heated in the microwave oven together with the article, because the microwave cannot penetrate through the tag antenna metal conductor, the charge accumulation on the antenna surface exceeds the bearing limit under the action of the strong electromagnetic field of the microwave oven, and particularly, the electric arc discharge can be generated at the binding part of the antenna and the chip, the narrow part, the bent part or the dense part of the antenna conductor, so that the deflagration can occur, the tag and the article can be damaged, and the serious safety problem can be caused.
Currently, the RFID tag suitable for the microwave oven has the following design methods: 1. the tag antenna is covered by a material with high dielectric coefficient, and the capacitance is increased, so that the antenna conductor can contain more charges; 2. providing a sacrificial conductor or shield conductor structure to disperse charge accumulation; 3. and a microwave reflection or heat sink connecting structure is arranged at the label chip to reflect or absorb heat. These methods are based on conventional metal antennas, require additional structures to disperse or inhibit charge accumulation, have complex manufacturing processes and high processing costs, and are not suitable for mass production and large-scale application.
Based on the defects of the conventional metal material for manufacturing the RFID tag suitable for being heated by the microwave oven, a novel conductive, high-temperature-resistant and high-ignition-point material is needed to be used for improvement.
Disclosure of Invention
In view of the above, the present invention provides a graphene film RFID tag capable of being heated with a microwave oven and a method for manufacturing the same, so as to solve or at least partially solve the technical problems in the prior art.
In a first aspect, the present invention provides a graphene film RFID tag heatable with a microwave oven, comprising:
the graphene film antenna is positioned on the substrate, and the chip is bound with the graphene film antenna;
the graphene film antenna is obtained by processing a graphene film;
the preparation method of the graphene film comprises the following steps:
coating the graphene oxide slurry on a substrate, and drying to obtain a graphene oxide film;
annealing the graphene oxide film at 1000 to 1500 ℃ for 1 to 3h and then at 2500 to 3000 ℃ for 0.5 to 1h under an inert atmosphere to obtain a pretreated graphene film;
and statically calendaring the preprocessed graphene film for 0.5 to 2h under the pressure of 100 to 300MPa to obtain the graphene film.
Preferably, the graphene film RFID tag heatable with a microwave oven is prepared by the following steps: mixing and stirring 4-16 parts by weight of graphene oxide in 84-96 parts by weight of water for dispersion, adding 0.1-1 part by weight of doping agent after the viscosity of the mixture rises to 10 Pa.s, continuing stirring, further stirring for dispersion after the viscosity of the doping agent is reduced to below 1 Pa.s, adding an alkaline substance after dispersion is finished, adjusting the pH value of the mixture to be more than 7, and stirring until the viscosity rises to more than 30 Pa.s to obtain graphene oxide slurry;
wherein the dopant comprises at least one of a halogen salt and a metal oxide;
the halogen salt comprises at least one of fluorine salt, chlorine salt, bromine salt and iodine salt;
the metal oxide includes at least one of titanium dioxide, calcium oxide, and iron oxide.
Preferably, the graphene film RFID tag capable of being heated with a microwave oven has the following performance parameters: the thickness is 20 to 100 mu m, and the conductivity is 10 5 ~10 6 S/m, thermal conductivity of 900-1500W/(m.K), ignition point of 850 deg.C or higher, and electron moving speed of 10 or higher 6 S/m。
Preferably, the graphene film RFID tag capable of being heated along with the microwave oven further comprises a surface material, wherein a high-temperature-resistant adhesive is coated on the bottom surface of the surface material so as to enable the surface material to be attached to the base material and cover the graphene film antenna and the chip.
Preferably, the graphene film RFID tag heatable with a microwave oven, the base material and the surface material are made of a high molecular polymer film material.
Preferably, the graphene film RFID tag heatable with a microwave oven includes one of PET, PP, PE, and PI.
Preferably, in the graphene film RFID tag capable of being heated with a microwave oven, the dielectric constant of the high polymer film material is 2~5 within 1000 MHz.
In a second aspect, the invention further provides a preparation method of the graphene film RFID tag capable of being heated with a microwave oven, which includes the following steps:
an antenna structure matched with the complex impedance conjugate of the chip is designed by using electromagnetic simulation software;
processing the graphene film into a graphene film antenna according to the designed antenna structure;
binding the graphene film antenna with the chip, then coating high-temperature-resistant glue on the chip, drying and curing, and then attaching the graphene film antenna and the chip to a substrate.
Preferably, in the preparation method of the graphene film RFID tag capable of being heated along with the microwave oven, the high-temperature-resistant glue is coated on the chip, and then the chip is dried at 80 to 100 ℃ for 1 to 2h and then cured.
Preferably, in the preparation method of the graphene film RFID tag heatable with a microwave oven, if the graphene film RFID tag further includes a surface material, the preparation method of the graphene film RFID tag further includes attaching the surface material to the base material, and the surface material covers the graphene film antenna and the chip.
Compared with the prior art, the graphene film RFID label capable of being heated along with the microwave oven has the following beneficial effects:
according to the graphene film RFID tag capable of being heated along with the microwave oven, the self-assembled graphene film with high conductivity, high thermal conductivity and high ignition point is adopted to replace conventional metals such as copper and aluminum to serve as an antenna material, and an RFID tag antenna form meeting application requirements of different frequency bands is designed and manufactured; selecting a high molecular polymer as a base material, covering a layer of high-temperature-resistant protective glue above the chip after the chip is bound with the antenna port, and adhering the prepared label to the outer surface or the inner side of the article package to carry a series of data information of the article and provide intelligent package for the article; no extra structure is required to be introduced to disperse or inhibit the accumulation of charges on the metal antenna conductor, so that the cost of the tag is reduced, the safety performance is improved, other cooking modes of the tag along with articles in a microwave oven for heating, unfreezing and the like are realized, and the related operation process of the microwave oven is further controlled; the RFID tag can simplify the tag manufacturing process, reduce the cost and realize mass production and large-scale application while improving the use safety of the tag in a microwave oven.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a graphene film RFID tag that can be heated with a microwave oven according to the present invention;
fig. 2 is a schematic structural diagram of a graphene film antenna according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a graphene film antenna according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a graphene film antenna according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a graphene film antenna according to another embodiment of the present invention;
FIG. 6 is a schematic view of a microwave heatable graphene film RFID tag of the present invention interacting with a reader with an attached item and controlling a microwave oven;
fig. 7 is a graph comparing a microwave heatable graphene film RFID tag prepared in example 1 of the present invention with an attached article with a conventional RFID tag after heating in a microwave oven.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides a graphene film RFID tag capable of being heated with a microwave oven, as shown in FIG. 1, including:
a substrate 1;
a chip 2 located on the substrate 1;
a graphene film antenna 3 bound to the chip 2;
the graphene film antenna is obtained by processing a graphene film;
the preparation method of the graphene film comprises the following steps:
coating the graphene oxide slurry on a substrate, and drying to obtain a graphene oxide film;
annealing the graphene oxide film at 1000-1500 ℃ for 1-3h and then at 2500-3000 ℃ for 0.5-1h under an inert atmosphere to obtain a pretreated graphene film;
and statically calendaring the preprocessed graphene film for 0.5 to 2h under the pressure of 100 to 300MPa to obtain the graphene film.
It should be noted that, in the graphene film RFID tag capable of being heated with a microwave oven, a self-assembled graphene film with high conductivity, high thermal conductivity and high ignition point is used as an antenna material instead of conventional metals such as copper and aluminum, and an RFID tag antenna form meeting application requirements of different frequency bands is designed and manufactured; selecting a high molecular polymer as a base material, covering a layer of high-temperature-resistant protective glue above the chip after the chip is bound with the antenna port, and adhering the prepared label to the outer surface or the inner side of the article package to carry a series of data information of the article and provide intelligent package for the article; no extra structure is required to be introduced to disperse or inhibit the accumulation of charges on the metal antenna conductor, so that the cost of the tag is reduced, the safety performance is improved, other cooking modes of the tag along with articles in a microwave oven for heating, unfreezing and the like are realized, and the related operation process of the microwave oven is further controlled; the RFID tag can simplify the tag manufacturing process, reduce the cost and realize mass production and large-scale application while improving the use safety of the tag in a microwave oven.
Specifically, in the embodiment, in the preparation method of graphene, the graphene oxide slurry is stirred, dispersed, coated on the substrate, and dried to obtain the graphene oxide film; carrying out gradient heating thermal reduction treatment on the graphene oxide film under an inert atmosphere, specifically, annealing at 1000-1500 ℃ for 1-3h and then at 2500-3000 ℃ for 0.5-1h to obtain a fluffy pretreated graphene film; and statically rolling the pretreated graphene film for 0.5 to 2h under the pressure of 100 to 300MPa to obtain the graphene film suitable for antenna processing.
Specifically, the inert atmosphere may be argon, helium, nitrogen, or the like.
In some embodiments, the graphene oxide slurry is prepared by: mixing and stirring 4-16 parts by weight of graphene oxide in 84-96 parts by weight of water for dispersion, adding 0.1-1 part by weight of doping agent after the viscosity of the mixture rises to 10 Pa.s, continuing stirring, further stirring for dispersion after the viscosity of the doping agent is reduced to below 1 Pa.s, adding an alkaline substance after dispersion is finished, adjusting the pH value of the mixture to be more than 7, and stirring until the viscosity rises to more than 30 Pa.s to obtain graphene oxide slurry;
wherein the dopant comprises at least one of a halide salt and a metal oxide;
the halogen salt comprises at least one of fluorine salt, chlorine salt, bromine salt and iodine salt;
the metal oxide includes at least one of titanium dioxide, calcium oxide, and iron oxide.
In some embodiments, the graphene film has the following suitable performance parameters for RFID tag antenna processing and microwave heating applications: the thickness is 20 to 100 mu m, and the conductivity is 10 5 ~10 6 S/m, thermal conductivity of 900-1500W/(m.K), ignition point of 850 deg.C or higher, and electron moving speed of 10 or higher 6 S/m。
Specifically, the graphene antenna 3 is formed by processing a graphene film by laser etching or a die cutting machine; the chip 2 adopts the existing chip, such as Injejie Impinj Monza R6 chip, and can write a series of data information such as price and preservation period information, production and logistics inventory information, raw material and allergen information, microwave oven operation instructions and cautionary matters of the attached articles.
In some embodiments, the microwave heatable graphene film RFID tag of the present application further comprises a facestock 4, the facestock 4 being attached to the substrate 1 and covering the graphene film antenna 3 and the chip 2.
In some embodiments, the substrate 1 and the face stock 4 are both made of a polymeric film material.
In some embodiments, the high molecular weight polymer film material comprises one of PET (i.e., polyethylene terephthalate), PP (i.e., polypropylene), PE (i.e., polyethylene), PI (i.e., polyimide); the dielectric constant of the high molecular polymer film material is 2~5 within 1000 MHz.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the graphene film RFID label capable of being heated along with the microwave oven, which comprises the following steps:
s1, designing an antenna structure matched with complex impedance conjugate of a chip by using electromagnetic simulation software;
s2, processing the graphene film into a graphene film antenna according to the designed antenna structure;
and S3, binding the graphene film antenna with the chip, coating high-temperature-resistant glue on the chip, drying, curing, and attaching the graphene film antenna and the chip to the substrate.
In the above embodiment, the graphene film antenna is bound to the chip by using a conventional binding process in the prior art, so that the pin of the chip is electrically connected to the graphene film antenna; and then coating a high-temperature-resistant adhesive on the chip, drying and curing, attaching the graphene film antenna and the chip to a substrate, and referring to fig. 1 again, coating the high-temperature-resistant adhesive on the chip to form a structure shown as 34. Specifically, a high temperature resistant adhesive can be coated on the substrate to attach the graphene film antenna and the chip to the substrate, and specifically, the high temperature resistant adhesive can be british standard high temperature adhesive. The working frequency of the graphene film antenna comprises but is not limited to an HF frequency band of 13.56MHz and a UHF frequency band of 800 to 1000 MHz.
In some embodiments, the high temperature resistant glue is coated on the chip and then dried for 1 to 2h at 80 to 100 ℃ and then cured; specifically, the high-temperature-resistant glue can be Hassuncast 735 heat-conducting epoxy resin high-temperature-resistant glue.
In some embodiments, attaching the graphene film antenna and the chip to the substrate further comprises: attaching a surface material to the substrate, wherein the surface material covers the graphene film antenna and the chip; specifically, referring to fig. 1 again, a high temperature resistant adhesive 5 may be coated on a bottom surface of the plane material, and then the plane material is attached to the substrate, so that the plane material plays a role in protecting the graphene antenna and the chip. Specifically, the high temperature resistant adhesive 5 can be H-2201 high temperature resistant epoxy adhesive, deyi DY-E802 high temperature resistant adhesive, and the like.
The following further describes a method for producing a graphene film and a method for producing an RFID tag according to the present application with specific examples. This section further illustrates the present invention with reference to specific examples, which should not be construed as limiting the invention. The technical means employed in the examples are conventional means well known to those skilled in the art, unless otherwise specified. Reagents, methods and apparatus employed in the present invention are conventional in the art unless otherwise indicated.
Example 1
The embodiment of the application provides a preparation method of a graphene film RFID label capable of being heated along with a microwave oven, which comprises the following steps:
s1, designing an antenna structure matched with complex impedance conjugate of a chip by using electromagnetic simulation software;
s2, processing the graphene film into a graphene film antenna according to the designed antenna structure;
s3, binding the graphene film antenna with the chip, coating Hasuncast 735 heat-conducting epoxy resin high-temperature-resistant glue on the chip, drying, curing, and then attaching the graphene film antenna and the chip to the substrate;
s4, attaching a surface material to the base material, wherein the surface material covers the graphene film antenna and the chip;
the structure of the graphene film antenna is shown in fig. 2, the chip is an Impinj Monza R6 chip, and the surface material and the base material are both PET materials;
the preparation method of the graphene film comprises the following steps:
coating the graphene oxide slurry on a substrate, and drying to obtain a graphene oxide film;
annealing the graphene oxide film at 1200 ℃ for 2h and then at 2800 ℃ for 1h in an argon atmosphere to obtain a pretreated graphene film;
then carrying out static calendering treatment on the pretreated graphene film for 1h under the pressure of 300MPa to obtain the graphene film;
the preparation method of the graphene oxide slurry comprises the following steps: adding 10 parts by weight of graphene oxide into 90 parts by weight of deionized water, mixing, stirring and dispersing, adding 0.8 part by weight of doping agent after the viscosity of the mixture rises to 10 pas, continuing stirring, adding ammonia water after the doping agent is uniformly dispersed and the viscosity is reduced to below 1 pas, further stirring and dispersing, adding ammonia water after the dispersion is finished, adjusting the pH value of the mixture to 11, and stirring until the viscosity rises to above 30 pas to obtain graphene oxide slurry; wherein the dopant is ferric oxide;
the graphene film prepared by the method has a thickness of 25 μm and a conductivity of 1.5 × 10 6 S/m, thermal conductivity 1300W/(m.K), ignition point 900 deg.C, and electron moving speed 3 × 10 6 m/s。
The structure of the graphene film antenna is shown in fig. 2, the chip is an Impinj Monza R6 chip, and the surface material and the base material are both PET materials. The graphene film antenna is a deformation of a conventional ultrahigh frequency dipole antenna, the working frequency range is 860-960 MHz, and the central frequency is 920 MHz. And the size of the graphene film antenna is effectively reduced by adopting a bent line technology and a terminal loading technology. The graphene film antenna 3 specifically comprises a plurality of bending sections 30, a middle square ring 31 and a tail end loading section 32, wherein the square ring 31 is of a T-shaped impedance matching structure, so that the conjugate matching of the input impedance of the antenna and the complex impedance of the Impinj R6 chip is conveniently adjusted, and the maximum energy transmission from the antenna to the chip is realized; the overall size of the graphene film antenna 3 is 60 mm × 25 mm (i.e., length and width), the line width of the bending section 30 is 1.5 mm, the line width of the end loading section is 5 mm, and the size of the square ring 31 is 10 mm × 9 mm (i.e., length and width). Specifically, fig. 2 shows a schematic diagram of coating the chip 2 with the high temperature resistant glue 35.
The RFID tag obtained in example 1 was attached to an article and then heated in a microwave oven; meanwhile, an RFID label with conventional aluminum as an antenna is adhered to an article and then is placed in a microwave oven for heating, and comparison is carried out; in the presence of heat
After 15 seconds, the RFID label taking the aluminum as the antenna is subjected to deflagration at the bent part of the antenna, the label is damaged, and the RFID label using the graphene film antenna in the application can still keep the original shape even after being heated for 5 minutes, so that the label can be normally used. The schematic view after heating is shown in fig. 7. As is apparent from fig. 7, deflagration occurs at the bent portion of the antenna of the RFID tag in which aluminum is the antenna.
Example 2
The preparation method of the graphene film RFID tag capable of being heated with the microwave oven provided by the embodiment of the application is the same as that of the embodiment 1, and the difference is that the structure of the graphene film antenna is shown in FIG. 3. The graphene film antenna is based on the graphene film antenna in embodiment 1, a resistor 33 is loaded near an antenna port, and the size of the resistor 33 is 6 mm × 5 mm (namely, the length and the width); the resistor 33 is loaded near the port of the graphene antenna 3, so that charges can be shunted to the loading resistor 33, and the charge accumulation at the port of the graphene film antenna is dispersed.
The graphene film RFID label capable of being heated along with a microwave oven, which is prepared by the method, is heated in the microwave oven for 5 minutes and then is kept as it is, and the label is normally used.
Example 3
The preparation method of the graphene film RFID tag capable of being heated with the microwave oven provided by the embodiment of the application is the same as that of the embodiment 1, and the difference is that the structure of the graphene film antenna is shown in FIG. 4. On the basis of the graphene film antenna in embodiment 2, the corner cutting treatment is performed at the bending and top corners of the antenna, so that all the right corners of the antenna are in arc transition, the edge is smoother, and the phenomenon that the tips of the antenna conductor discharge to generate deflagration is further avoided.
The graphene film RFID label capable of being heated along with a microwave oven, which is prepared by the method, is heated in the microwave oven for 5 minutes and then is kept as it is, and the label is normally used.
Example 4
The preparation method of the graphene film RFID tag capable of being heated with the microwave oven provided by the embodiment of the application is the same as that of the embodiment 1, and the difference is that the structure of the graphene film antenna is shown in FIG. 5. The graphene film antenna is a conventional high-frequency coil antenna, the working frequency is 13.56MHz, the number of coil turns is 5, the coil distance is 2mm, and the line width is 1mm. Related personnel can read the information of the articles carried by the label by using a mobile phone with an NFC function, and the interaction of persons packaged intelligently is further improved. As shown in fig. 6, the frame diagram is a frame diagram in which the tag interacts with the reader/writer 6 along with the attached article 8 and controls the microwave oven 7, the reader/writer reads article information data written in the tag chip in advance, and can first determine whether the article can be heated in the microwave oven, and then send a specific operation mode for the article to the microwave oven, thereby realizing the automatic operation of the microwave oven.
The graphene film RFID label capable of being heated along with a microwave oven, which is prepared by the method, is heated in the microwave oven for 5 minutes and then is kept as it is, and the label is normally used.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A graphene film RFID tag heatable with a microwave oven, comprising: substrate, graphite alkene membrane antenna and chip, graphite alkene membrane antenna is located on the substrate, the chip with the chip
Binding the graphene film antenna;
the graphene film antenna is obtained by processing a graphene film;
the preparation method of the graphene film comprises the following steps:
coating the graphene oxide slurry on a substrate, and drying to obtain a graphene oxide film;
annealing the graphene oxide film at 1200 ℃ for 2h and then at 2800 ℃ for 1h under an inert atmosphere to obtain a pretreated graphene film;
then carrying out static calendering treatment on the pretreated graphene film for 1h under the pressure of 300MPa to obtain the graphene film;
the preparation method of the graphene oxide slurry comprises the following steps: mixing and stirring 10 parts by weight of graphene oxide in 90 parts by weight of water for dispersion, adding 0.8 part by weight of dopant after the viscosity of the mixture is increased to 10 pas, continuously stirring, further stirring for dispersion after the dopant is uniformly dispersed and the viscosity is reduced to below 1 pas, adding ammonia water after the dispersion is finished, adjusting the pH value of the mixture to 11, and stirring until the viscosity is increased to above 30 pas to obtain graphene oxide slurry;
wherein the dopant is iron oxide;
the graphene film had a thickness of 25 μm and an electrical conductivity of 1.5X 10 6 S/m, thermal conductivity 1300W/(m.K), and ignition point 900 ℃.
2. The microwave heatable graphene film RFID tag of claim 1, further comprising a facestock, wherein a high temperature adhesive is coated on a bottom surface of the facestock to adhere the facestock to the substrate and cover the graphene film antenna and the chip.
3. The microwave heatable graphene film RFID tag of claim 1, wherein the material of the substrate and the facestock is a high molecular polymer film material.
4. The microwave heatable graphene film RFID tag according to claim 3, wherein the polymeric film material comprises one of PET, PP, PE, PI.
5. The microwave heatable graphene film RFID tag of claim 3, wherein the high molecular polymer film material has a dielectric constant of 2~5 within 1000 MHz.
6. A method of making a microwave heatable graphene film RFID tag according to any one of claims 1~5, comprising the steps of:
an antenna structure matched with the complex impedance conjugate of the chip is designed by using electromagnetic simulation software;
processing the graphene film into a graphene film antenna according to the designed antenna structure;
binding the graphene film antenna with the chip, then coating high-temperature-resistant glue on the chip, drying and curing, and then attaching the graphene film antenna and the chip to a substrate.
7. The method for preparing the graphene film RFID tag capable of being heated with the microwave oven according to claim 6, wherein the high temperature resistant glue is coated on the chip, and then the chip is dried at 80 to 100 ℃ for 1 to 2h and then cured.
8. The method of claim 6, wherein if the graphene film RFID tag further comprises a facestock, the method further comprises adhering a facestock to the substrate, the facestock covering the graphene film antenna and the chip.
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