CN108872318B - Self-powered respiration sensor based on bionic nasal cavity structure and preparation method thereof - Google Patents
Self-powered respiration sensor based on bionic nasal cavity structure and preparation method thereof Download PDFInfo
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Abstract
A self-powered respiration sensor based on a bionic nasal cavity structure and a preparation method thereof belong to the technical field of sensors. The surface of the inner wall of the insulating cylinder is covered with an electrode layer, friction electrification units which are arranged along the normal direction in the inner wall surface of the insulating cylinder like nose hair are arranged on the electrode layer in order to form a power generation array, wherein the friction electrification units comprise flexible friction layers, conductive layers and sensitive film layers, and under the drive of respiratory airflow, adjacent friction electrification units form contact-separation circulation, so that induction charges are generated, and electric signals are output to an external detection circuit through the electrode layer. Compared with the traditional sensor, the invention ensures the miniaturization of the device, obviously enhances the output electric signal by increasing the friction contact area, is beneficial to improving the detection precision, has novel and simple structural design, low cost, portability and portability, is easy to obtain materials and convenient to process, does not need to be in a special environment, has strong compatibility and is not limited by application occasions.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a self-powered respiration sensor based on a bionic nasal cavity structure and a preparation method thereof.
Background
The existing research shows that the types and the contents of substances in human breath are related to the physical condition of a human body, so that a new disease diagnosis mode, namely breath diagnosis is developed, namely, the change of the corresponding tissue cell metabolism is reflected by detecting the change of the components of the exhaled air of the human body, and the health condition of the human body is further represented. Compared with the traditional diagnosis method, the breath diagnosis is gradually paid more attention by more and more researchers and is rapidly developed by virtue of the advantages of rapidness and convenience, for example: examination of gastric Helicobacter Pylori (HP) breath tests are widely used; the clinical diagnosis of asthma takes the content of nitrogen oxide in the exhaled breath condensate as an important detection index; in addition, diabetes detection and early diagnosis of lung cancer, breath detection have been the focus of research.
The breath detection is used as the basis of breath diagnosis, and aims to accurately measure the components and the content of substances in exhaled air of a person, determine the cost of characteristic gas related to pathological changes according to the components and the content, and establish a disease diagnosis model through statistics, mode recognition and other modes. Therefore, it is of great significance to develop a sensor (i.e. a respiration sensor) for detecting gas substances in human respiration, and the research and development of the respiration sensor has a wide market development prospect in the field of respiration diagnosis.
The gas sensor is an element for responding to gas to be measured, and the gas sensor is a core element for converting a chemical signal into an electrical signal, however, a circuit system matched with the gas sensor is usually required for measuring the change of resistance or capacitance, and an external power supply is required for supplying energy to the gas sensor, so that the gas sensor needs many auxiliary elements, the whole structure is complex, the gas sensor is difficult to carry, the energy consumption is high, and the working requirement of the gas sensor cannot be met for a long time. The self-energy supply technology works by collecting energy supply in the external environment, and the gas sensor based on the self-energy supply technology is researched to solve the problem that the device is supplied with power independently for a long time. Nowadays, the exploration of energy harvesting technology and new energy sources is leading direction in research fields in various disciplines. Although the conventional power technology has been developed for nearly two hundred years, the human search for new energy and new energy collection methods, such as photoelectric effect, piezoelectric effect, pyroelectric effect, electrochemical reaction, and electrostatic induction, has never been stopped. In order to solve the problems of short service life, high power consumption, need of external power supply and the like of the traditional gas sensor, researchers have introduced self-powered technology into the research of the gas sensor and developed self-powered gas sensors based on photoelectric effect or photovoltaic effect, however, such devices have the defects of small output, complex manufacture, high cost, difficulty in large-scale integration and the like, and the practicability and commercialization of the breathing sensor are restricted.
Mechanical energy is one of the most common energy forms in the nature, has the characteristics of wide distribution, large scale, cleanness, environmental protection, direct collection and the like, and gradually becomes a hotspot in the field of energy and material research in recent years. Triboelectrification is a very common phenomenon in daily life, and refers to a process of charge transfer by physical contact between objects. The static electricity is generated by transferring triboelectric charges during triboelectric charging, and the formation of triboelectric charges during triboelectric charging depends on the difference in triboelectric polarities of the contact materials. Although triboelectrification, a common phenomenon that is recognized by humans for nearly a thousand years, its mechanism of formation has not yet been fully studied. One explanation that is now accepted by the scientific community is that when two materials with different triboelectric polarities are contacted, a chemical bond is formed at a partial position of the contact, and the formation of the chemical bond can transfer charges from one material to the other material to balance the electrochemical potentials of the two materials, wherein the transferred charges can be electrons, ions or molecules; when the two materials are separated, some bond atoms of the contact surface can retain redundant electrons, and other bond atoms can reject redundant electrons, so that triboelectric charges are formed on the surface of the contact surface. The triboelectric nano generator prepared by the coupling effect of friction electrification and electrostatic induction can directly convert mechanical energy in the environment into an electric signal to be output, has the advantages of strong output signal, simple structure, low cost, high integration level and the like, and provides a new development direction for the research of a self-powered gas sensor.
Disclosure of Invention
In view of the prior art requirements, the invention provides a novel self-powered sensor for detecting respiratory gas, which adopts a bionic nasal cavity structure, combines a sensitive material and a friction material, takes respiratory gas flow as an energy source, and finally realizes autonomous and stable detection of the concentration of a target substance in the exhaled gas flow.
In order to achieve the purpose, the invention provides the following technical scheme:
on one hand, the invention provides a self-powered respiration sensor based on a bionic nasal cavity structure, which is characterized in that: the device comprises an insulating cylinder for breathing air to pass through, wherein an electrode layer is arranged on the surface of the inner wall of the insulating cylinder; the electrode layer is provided with a power generation array which is uniformly distributed along the inner circumference of the insulating cylinder; the power generation array comprises the components of independent friction electrification units, wherein each friction electrification unit comprises a flexible friction layer, a sensitive film layer arranged on the surface of one side of the flexible friction layer and a conductive layer arranged on the surface of the other side of the flexible friction layer; the triboelectrification unit is arranged along the normal direction in the inner wall surface of the insulating cylinder, so that the conductive layer is in contact with the electrode layer on the inner wall of the insulating cylinder; any one of the friction electrification units is arranged opposite to the adjacent friction electrification unit along the gas circulation path direction, when no air flow passes through the insulating cylinder, the adjacent friction electrification units are not in contact with each other, when the air flow passes through the insulating cylinder, the conductive layers and the flexible friction layers in the two adjacent friction electrification units form contact-separation circulation, so that induction charges are generated, and an electrical signal is output to an external detection circuit through the electrode layers.
Further, in the present invention, a difference in a rubbing electrode order exists between a material of the flexible rubbing layer and a material of the conductive layer.
Further, the triboelectric charging unit is a strip-shaped triboelectric charging unit.
Further, the sensitive film layer in the invention adopts the target gasVolume sensitive organic polymers, metal oxides and inorganic materials; as a preferred mode, the organic polymers include, but are not limited to: any one or more of ethylene oxide (PEO), Polyethyleneimine (PEI), sodium polystyrene sulfonate (PSS), polypyrrole (Ppy), Polyaniline (PANI), Polyimide (PI) and Chitosan (CS); preferably, the metal oxides include, but are not limited to: fe2O3、ZnO2、SnO2、TiO2And WO3Any one or more of; preferably, the inorganic material includes, but is not limited to: any one or more of Graphene Oxide (GO) and reduced graphene oxide (rGO).
Further, the material of the flexible friction layer in the present invention is a flexible polymer, including but not limited to: any one of teflon (PTFE), polyethylene terephthalate (PET), and Polyimide (PI).
Further, the material of the conductive layer in the present invention is any one or more of aluminum, nickel, copper, silver, gold, and indium tin oxide.
Furthermore, the conductive layer on the frictional electrification unit can be used for depositing a conductive material on the surface of the flexible friction layer or directly pasting a conductive film, and as a preferred mode, the thickness of the conductive layer ranges from 100 nm to 200 nm; preferably, the thickness of the electrode layer is 50 to 70 μm.
Furthermore, the electrode layer on the surface of the inner wall of the insulating cylinder can be directly attached with a copper foil or an aluminum foil on the surface; preferably, the thickness of the copper foil or aluminum foil is 50 to 150 μm.
Further, the insulating cylinder is made of any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and organic glass.
On the other hand, the invention provides a preparation method of a self-powered respiration sensor based on a bionic nasal cavity structure, which is characterized by comprising the following steps:
step A: manufacturing a friction electrification unit; selecting a flexible insulating polymer as a material of a flexible friction layer, then manufacturing a sensitive thin film layer on one surface of the flexible friction layer, manufacturing a conductive layer on the other surface of the flexible friction layer to form a friction electrification unit, and repeating the operation to obtain a plurality of friction electrification units with the same size;
and B: and C, manufacturing an electrode layer on the surface of the inner wall of the insulating cylinder, arranging the friction electrification units obtained in the step A along the normal direction in the inner wall surface of the insulating cylinder, enabling the conductive layer to be in contact with the electrode layer, uniformly distributing the friction electrification units along the inner circumference of the insulating cylinder to form a power generation array, enabling any friction electrification unit to be arranged opposite to the friction electrification unit adjacent to the friction electrification unit along the gas circulation path direction, enabling the adjacent friction electrification units not to be in contact with each other when no current flows through the insulating cylinder, and enabling the conductive layer and the flexible friction layer in the two adjacent friction electrification units to form a contact-separation cycle when current flows through the insulating cylinder, so that mechanical energy is converted into electric energy, and the electric signal change of the sensitive film is output through an external detection circuit.
Further, in the present invention, a difference in a rubbing electrode order exists between a material of the flexible rubbing layer and a material of the conductive layer.
Further, the triboelectric charging unit is a strip-shaped triboelectric charging unit.
Furthermore, the sensitive thin film layer adopts organic polymers, metal oxides and inorganic materials which are sensitive to target gases; as a preferred mode, the organic polymers include, but are not limited to: any one or more of ethylene oxide (PEO), Polyethyleneimine (PEI), sodium polystyrene sulfonate (PSS), polypyrrole (Ppy), Polyaniline (PANI), Polyimide (PI) and Chitosan (CS); preferably, the metal oxides include, but are not limited to: fe2O3、ZnO2、SnO2、TiO2And WO3Any one or more of; preferably, the inorganic material includes, but is not limited to: any one or more of Graphene Oxide (GO) and reduced graphene oxide (rGO).
Further, the material of the flexible friction layer in the present invention is a flexible polymer, including but not limited to: any one of teflon (PTFE), polyethylene terephthalate (PET), and Polyimide (PI).
Further, the material of the conductive layer in the present invention is any one or more of aluminum, nickel, copper, silver, gold, and indium tin oxide.
Furthermore, the conductive layer on the frictional electrification unit can be used for depositing a conductive material on the surface of the flexible friction layer or directly pasting a conductive film, and as a preferred mode, the thickness of the conductive layer ranges from 100 nm to 200 nm; preferably, the thickness of the electrode layer is 50 to 70 μm.
Furthermore, the electrode layer on the surface of the inner wall of the insulating cylinder can be directly attached with a copper foil or an aluminum foil on the surface; preferably, the thickness of the copper foil or aluminum foil is 50 to 150 μm.
Further, the insulating cylinder is made of any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and organic glass.
The principle of the invention is as follows:
compared with the prior art, the invention has the beneficial effects that:
compared with the traditional sensor, the invention directly adopts the respiratory airflow as an energy supply source, drives the sensor to spontaneously detect the concentration of target gas, deposits sensitive materials on the friction electrification unit, combines the gas-sensitive chemical mechanism with the friction electrification principle, and forms an array in the test cavity by the bionic nasal cavity structure and the flexible friction electrification unit to form an integrated self-powered sensor, thereby ensuring the miniaturization of the device.
Drawings
Fig. 1 is a schematic structural diagram of a self-powered gas sensor according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a triboelectric unit in a self-powered gas sensor according to an embodiment of the present invention.
Fig. 3 is a flow chart of a process for manufacturing a self-powered gas sensor according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the operation of a self-powered gas sensor according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a sensing mechanism of a self-powered gas sensor according to an embodiment of the present invention.
Fig. 6 is a graph of the voltage output of a self-powered gas sensor for different concentrations of ammonia gas provided by an embodiment of the present invention.
In the figure: 1 is an insulating cylinder, 2 is a metal film, 3 is a flexible friction layer, 4 is a conductive layer, 5 is a gas sensitive film layer, and 6 is a Keithley6514 electrometer.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings and detailed description of specific embodiments, in order that those skilled in the art can understand the principle of operation and the function that can be achieved:
fig. 1 is a simulation view of the overall structure of a self-powered gas sensor according to an embodiment of the present invention, as shown in fig. 1(b), and fig. 1(a) is a simulation view of a cross section taken along a radial direction in fig. 1 (b). The self-powered gas sensor comprises an insulating cylinder 1 for breathing gas to pass through, and the insulating cylinder 1 as a test cavity needs to have certain hardness; a metal film 2 is arranged on the surface of the inner wall of the insulating cylinder 1 and serves as an electrode layer; the metal film 2 is provided with a power generation array which is uniformly distributed along the inner circumference of the insulating cylinder; the power generation array comprises mutually independent friction electrification units, wherein the friction electrification units are shown in fig. 2, and the strip-shaped friction electrification units are adopted in the embodiment and comprise strip-shaped flexible friction layers 3, sensitive film layers 5 arranged on the surfaces of one sides of the strip-shaped flexible friction layers 3 and conductive layers 4 arranged on the surfaces of the other sides of the strip-shaped flexible friction layers 3; the triboelectrification unit is arranged along the normal direction in the inner wall surface of the insulating cylinder 1, so that the conductive layer 4 is well contacted with the metal film 2 on the inner wall of the insulating cylinder 1, and is connected with an external detection circuit through an electrode on the inner wall of the insulating cylinder, namely a lead wire led out from the metal film 2; any one of the frictional electrification units is arranged opposite to the frictional electrification unit adjacent to the frictional electrification unit along the gas circulation path direction, when no air flow passes through the insulating cylinder 1, the adjacent frictional electrification units are not contacted with each other, when the air flow passes through the insulating cylinder 1, the conductive layers 4 and the flexible friction layers 3 in the two adjacent frictional electrification units form a contact-separation cycle to generate induction charges, and an electrical signal is output to an external detection circuit through the metal film 2.
In this embodiment, there is a difference in the electrode sequence between the material of the flexible friction layer 3 and the material of the conductive layer 4 in the triboelectric cell. In this embodiment, the sensitive thin film layer 5 is made of an organic polymer, a metal oxide, and an inorganic material that are sensitive to a target gas;
as a preferred embodiment, the organic polymers include, but are not limited to: any one or more of ethylene oxide (PEO), Polyethyleneimine (PEI), sodium polystyrene sulfonate (PSS), polypyrrole (Ppy), Polyaniline (PANI), Polyimide (PI) and Chitosan (CS);
as a preferred embodiment, the metal oxides include, but are not limited to: fe2O3、ZnO2、SnO2、TiO2And WO3Any one or more of;
as a preferred embodiment, the inorganic materials include, but are not limited to: any one or more of Graphene Oxide (GO) and reduced graphene oxide (rGO).
As a specific embodiment, the material of the flexible friction layer 3 is a flexible polymer, including but not limited to: any one of teflon (PTFE), polyethylene terephthalate (PET), and Polyimide (PI).
As a specific embodiment, the material of the conductive layer 4 may be any one or more of aluminum, nickel, copper, silver, gold, and indium tin oxide.
As a specific embodiment, the conductive layer 4 on the frictional electrification unit can be formed by depositing a conductive material on the surface of the flexible friction layer or directly pasting a conductive film, and as a preferred embodiment, the thickness of the conductive layer 4 is in the range of 100-200 nm; in a preferred embodiment, the thickness of the electrode layer is 50 to 70 μm.
As a specific embodiment, the electrode layer on the inner wall surface of the insulating cylinder 1 may be a plated metal film 2, or may be a copper foil or an aluminum foil directly attached to the surface thereof; in a preferred embodiment, the copper foil or aluminum foil has a thickness of 50 to 150 μm.
As a specific embodiment, the material of the insulating cylinder 1 is any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and organic glass.
Fig. 3 is a flow chart of a manufacturing process of the self-powered gas sensor according to the present embodiment, which includes the following steps:
step (a): as shown in fig. 3(a), polystyrene is selected as the material of the insulating cylinder 1, the length of the insulating cylinder is 10cm, the thickness of the wall of the insulating cylinder is 1mm, and the inner diameter is 4 cm;
step (b): as shown in fig. 3(b), a metal film 2 is manufactured on the inner wall surface of an insulating cylinder 1, and the thickness of the metal film 2 is 50-150 μm;
step (c): as shown in fig. 3(c), polyethylene terephthalate is selected as the material of the flexible friction layer 3, wherein the thickness of the flexible friction layer 3 is 100 to 200 μm;
step (d): as shown in fig. 3(d), a metal film or a bonded metal electrode is deposited on one surface of the flexible friction layer 3 as a conductive layer 4, wherein the thickness of the metal film is 100 to 200nm, and the thickness of the metal electrode is 50 to 70 μm;
a step (e): as shown in fig. 3(e), depositing a gas-sensitive material on the other side of the flexible friction layer 3 processed in step (d) to form a sensitive thin film layer 5; in the embodiment, a large-area friction layer material is selected to be manufactured into a whole block according to the steps (d) and (e) and then cut into a plurality of strip-shaped friction electrification units, wherein the length of each strip-shaped friction electrification unit is about 10mm, the width of each strip-shaped friction electrification unit is about 2mm, and the steps (c) to (e) can be repeated to manufacture friction electrification units with proper sizes one by one;
step (f): the obtained multiple triboelectrification units are arranged along the normal direction in the inner wall surface of the insulating cylinder, so that the conductive layer is in contact with the electrode layer, the triboelectrification units are uniformly distributed along the inner circumference of the insulating cylinder to form a power generation array, the distance (4 mm in the embodiment) between every two adjacent triboelectrification units in the array is smaller than the length of the triboelectrification unit, so that any triboelectrification unit is arranged opposite to the triboelectrification unit adjacent to the triboelectrification unit along the gas flow path direction, the adjacent triboelectrification units are not in contact with each other when no gas flow passes through the insulating cylinder, and when gas flow passes through the insulating cylinder, the conductive layer and the flexible friction layer in every two adjacent triboelectrification units can form a contact-separation cycle, so that mechanical energy is converted into electric energy and the electric signal change of the sensitive film is output through an external detection circuit.
The working principle of the self-powered sensor provided by the invention is described in detail with reference to the attached figure 4:
the invention imitates the nasal cavity structure of living body, adopt the insulating cylinder 1 that can circulate the gas as the cavity, form the metal film 2 covering the whole surface as the electrode layer on the surface of inner wall of the insulating cylinder 1, there are large-area, friction that distribute neatly evenly on the metal film 2 and give up the electric unit, thus form the electricity generation array; in the frictional electrification unit, a flexible polymer is used as a material of a friction layer, a sensitive film layer 5 aiming at a gas substance to be detected is formed on one side surface of the flexible friction layer 3, and a conductive layer 4 is formed on the other side surface of the friction layer; the friction electrification units are arranged along the normal direction in the inner wall surface of the insulating cylinder, so that the conductive layer 4 is in good contact with the metal film 2, like nasal hair growing in a nasal cavity, when no gas flows through the insulating cylinder 1, the adjacent friction electrification units are kept in parallel and are not in contact with each other, when the gas flows through the insulating cylinder 1, the friction electrification units are bent by adopting a flexible material and are in contact with the adjacent friction electrification units, so that the conductive layer 4 on the friction electrification units is in contact with the adjacent flexible friction layers 3 with the sensitive film layer 5, due to the electrostatic shielding effect, the conductive layer 4 and the flexible friction layers 3 on the adjacent friction electrification units are provided with charges with the same quantity and the opposite charges, when the air flow passing through the insulating cylinder 1 is reduced, and due to the fact that the friction electrification units adopt the flexible material and have elasticity, the conductive layer 4 is separated from the adjacent flexible friction layers, the electron inflow positive charge of the conductive layer 4 is continuously reduced along with the increasing of the separation distance, when the friction electrification unit is recovered to be in an upright state, the positive charge on the conductive layer 4 is minimum, when the airflow continuously passes through the insulation cylinder 1, the adjacent friction electrification units are close to each other again and are finally attached together, and the positive charge on the conductive layer 1 is gradually increased in the process; the respiratory airflow is adopted to drive the adjacent friction electrification units to form the contact-separation cycle, the contact-separation cycle mode enables alternating electrical signals to be formed in the detection circuit, the flexible friction electrification units are provided with the sensitive thin film layers 5, when target gas in the insulation cylinder 1 is adsorbed on the surfaces of the sensitive thin film layers 5, the electric charge amount on the surfaces of the flexible friction layers 3 can be changed, induced charges on the conductive layers correspondingly change, and then the output electrical signals change, so that the concentration of the target gas in the respiratory airflow can be detected.
FIG. 5 shows a specific example of metal oxide (e.g., zinc oxide) vs. NH3The response mechanism is taken as an example, and shows the sensitivity mechanism of the self-powered gas sensor of the invention: when the sensitive material is in the air atmosphere, the sensitive material adsorbs oxygen, and the oxygen and the surface electrons of the sensitive material are combined to form O- 2(the reaction formula is specifically O2(gas)+e-→O- 2(ads)) when there is NH3After the gas is introduced, NH3O with the surface of the sensitive material- 2Reaction (the reaction formula is specifically 4 NH)3+3O- 2(ads)→2N2+6H2O+3e-) Surface O of sensitive material- 2The charge density on the contact surface is reduced, and therefore the generator electrical output is reduced.
When the target gas with a certain concentration is adsorbed on the surface of the sensitive film layer 5, the surface charge quantity of the friction layer is changed, and the generation (V) of the output electric signal of the sensor is further changedOC＝σd/0) Thereby detecting the concentration of the target gas in the respiratory gas.
Fig. 6 is a graph of the voltage output of the self-powered gas sensor provided by the present invention for different concentrations of ammonia. As can be seen from fig. 6: and ammonia gas with different concentrations is introduced, and the output voltage of the sensor is reduced along with the increase of the ammonia gas concentration.
While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a self-powered respiration sensor based on bionical nasal cavity structure which characterized in that: the device comprises an insulating cylinder for breathing air to pass through, wherein an electrode layer is arranged on the surface of the inner wall of the insulating cylinder; the electrode layer is provided with a power generation array which is uniformly distributed along the inner circumference of the insulating cylinder; the power generation array comprises the components of independent friction electrification units, wherein each friction electrification unit comprises a flexible friction layer, a sensitive film layer arranged on the surface of one side of the flexible friction layer and a conductive layer arranged on the surface of the other side of the flexible friction layer; the triboelectrification unit is arranged along the normal direction in the inner wall surface of the insulating cylinder, so that the conductive layer is in contact with the electrode layer on the inner wall of the insulating cylinder; any one of the friction electrification units is arranged opposite to the adjacent friction electrification unit along the gas circulation path direction, when no air flow passes through the insulating cylinder, the adjacent friction electrification units are not in contact with each other, when the air flow passes through the insulating cylinder, the conductive layers and the flexible friction layers in the two adjacent friction electrification units form contact-separation circulation, so that induction charges are generated, and an electrical signal is output to an external detection circuit through the electrode layers.
2. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: and a friction electrode sequence difference exists between the material of the flexible friction layer and the material of the conductive layer.
3. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: the triboelectrification unit is a strip-shaped triboelectrification unit.
4. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: the sensitive thin film layer is made of organic polymer, metal oxide or inorganic material sensitive to target gas.
5. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: the material of the flexible friction layer is flexible polymer, and comprises: any one of teflon (PTFE), polyethylene terephthalate (PET), and Polyimide (PI).
6. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: the conducting layer is made of any one or more of aluminum, nickel, copper, silver, gold and indium tin oxide.
7. The self-powered respiration sensor based on a biomimetic nasal cavity structure according to claim 1, wherein: the insulating cylinder is made of any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and organic glass.
8. A preparation method of a self-powered respiration sensor based on a bionic nasal cavity structure is characterized by comprising the following steps:
step A: manufacturing a friction electrification unit; selecting a flexible insulating polymer as a material of a flexible friction layer, then manufacturing a sensitive thin film layer on one surface of the flexible friction layer, manufacturing a conductive layer on the other surface of the flexible friction layer to form a friction electrification unit, and repeating the operation to obtain a plurality of friction electrification units with the same size;
and B: and C, manufacturing an electrode layer on the surface of the inner wall of the insulating cylinder, arranging the friction electrification units obtained in the step A along the normal direction in the inner wall surface of the insulating cylinder, enabling the conductive layer to be in contact with the electrode layer, uniformly distributing the friction electrification units along the inner circumference of the insulating cylinder to form a power generation array, enabling any friction electrification unit to be arranged opposite to the friction electrification unit adjacent to the friction electrification unit along the gas circulation path direction, enabling the adjacent friction electrification units not to be in contact with each other when no current flows through the insulating cylinder, and enabling the conductive layer and the flexible friction layer in the two adjacent friction electrification units to form a contact-separation cycle when current flows through the insulating cylinder, so that mechanical energy is converted into electric energy, and the electric signal change of the sensitive film is output through an external detection circuit.
9. The method for preparing a self-powered respiration sensor based on a bionic nasal cavity structure according to claim 8, wherein the method comprises the following steps: and a friction electrode sequence difference exists between the material of the flexible friction layer and the material of the conductive layer.
10. The method for preparing a self-powered respiration sensor based on a bionic nasal cavity structure according to claim 8, wherein the method comprises the following steps: the sensitive thin film layer is made of organic polymer, metal oxide or inorganic material sensitive to target gas.
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| CN109540999B (en) * | 2018-11-29 | 2021-08-24 | 电子科技大学 | Wireless passive self-powered atmospheric environment sensor array and preparation method thereof |
| CN110715957A (en) * | 2019-09-10 | 2020-01-21 | 中国科学院宁波材料技术与工程研究所 | Polystyrene sulfonic acid doped polyaniline composite flexible membrane based high-efficiency ammonia gas sensor and preparation method thereof |
| CN113397483B (en) * | 2021-05-20 | 2022-07-12 | 上海交通大学 | Flexible respiration sensor and preparation method thereof |
| CN113679123B (en) * | 2021-08-23 | 2023-05-05 | 电子科技大学 | Self-driven breathing monitoring intelligent mask and preparation method thereof |
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