CN108627267A - A kind of temperature sensor based on nano silver wire network - Google Patents
A kind of temperature sensor based on nano silver wire network Download PDFInfo
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- CN108627267A CN108627267A CN201810441492.6A CN201810441492A CN108627267A CN 108627267 A CN108627267 A CN 108627267A CN 201810441492 A CN201810441492 A CN 201810441492A CN 108627267 A CN108627267 A CN 108627267A
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- nano silver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/186—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer using microstructures
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A kind of temperature sensor based on nano silver wire network belongs to sensor field.Nano silver wire is prepared using existing polyol process, and is configured to nano silver wire ethanol solution.It prepares nano silver wire network on an insulating substrate using spin-coating method, the resistance of network is controlled by changing nano silver wire solution concentration and dosage.Dielectric substrate can prevent influence of the substrate to nano silver wire network resistor.Thin polymer film covering silver nano gauze network is finally used, nano silver wire is protected and its resistance is made no longer to be influenced by humidity, it is in a linear relationship with temperature, to achieve the purpose that measuring temperature.In the temperature sensor proposed in the present invention, when the environmental temperature is changed, the overlap joint of nano silver wire changes, and leads to contact resistance variation, then can ambient temperature signal be converted to electric signal.The present invention is at low cost, and manufacture craft is simple, is easy to industrialization, is suitable for face formula thermometric, there is high market value and industrialization potential.
Description
Technical field
The invention belongs to sensor fields, and in particular to a kind of face formula sensor for detecting temperature.
Background technology
In existing disclosed technology, temperature sensor mainly has two class of thermocouple and thermistor.Thermocouple is that temperature is surveyed
Most common temperature sensor in amount.Its key benefit is wide temperature range and adapts to various atmospheric environments, and solid, valence
It is low, without power supply.Thermocouple is made of the two different metal lines (metal A and metal B) connected at one end, when thermocouple one end
When heated, just there is potential difference in thermocouple circuit.Temperature can be calculated with the potential difference of measurement.But, it is between voltage and temperature
Non-linear relation, it is therefore desirable to the relationship of corresponding test equipment software processing voltage-temperature, finally to obtain thermocouple temperature.
Therefore thermocouple is not appropriate for high-precision measurement and application.Thermistor has preferable precision, but it is expensive, can thermometric
Range is spent again smaller than thermocouple.And existing temperature sensor is point measurement.
Nano wire by researcher due to dimensional effect, quantum effect, specific surface effect, being paid attention to.Numerous
In metal nanometer line, nano silver wire (Ag NWs) except with metallic silver itself mechanical performance, in addition to electrical and thermal conductivity performance, also have
Many unique properties such as good biocompatibility, antibiotic property, catalytic, make it in conducting resinl, transparent electrode, display, doctor
The fields such as antibacterial, Industrial Catalysis are treated to be widely used.Nano silver wire can be closed by polyol process simple and effective simultaneously
At nano silver wire network can be prepared by such as spray coating method, spin-coating method, drop-coating, bar method.Applicants have found that：Ring
The change of border temperature, humidity can cause the change of bonding state between nano silver wire, and contact resistance is caused to change network resistor in turn
It changes, and it is recoverable that this resistance, which changes at 100 DEG C or less,.But nano silver wire easy tos produce vulcanization etc. in air
Be corroded phenomenon, and electrical property is gradually destroyed.The resistance of nano silver wire network is linearly closed with temperature after the covering of cement-based powder material film
System determines environment temperature by the electric signal of electrical devices acquisition, measures purpose to reach temperature, and polymer film can have
Effect prevents nano silver wire to be corroded, the final stabilization for realizing sensor, reusable.
For this purpose, applicant prepares nano silver wire using existing polyol process, and it is configured to nano silver wire ethanol solution.It adopts
It prepares nano silver wire network on an insulating substrate with spin-coating method, network is controlled by changing nano silver wire solution concentration and dosage
Resistance.Dielectric substrate can prevent influence of the substrate to nano silver wire network resistor.Finally use thin polymer film covering silver nano
Gauze network protects nano silver wire and its resistance is made no longer to be influenced by humidity, in a linear relationship with temperature, is surveyed to reach
The purpose of amount temperature.
Invention content
The purpose of the present invention is to propose to a kind of temperature sensors based on nano silver wire network.
Another object of the present invention is to propose the preparation method of the temperature sensor based on nano silver wire network.
Realize that the technical solution of above-mentioned purpose of the present invention is：
A kind of temperature sensor based on nano silver wire network includes substrate, nano silver wire, electricity from bottom to up in structure
Pole, polymeric layer, the electrode are gold electrode, and electrode is placed in silver nanowire film both ends.The sensitivity of the temperature sensor of the present invention
Element is nano silver wire network, and the change of environment temperature and humidity can cause the change of bonding state between nano silver wire, cause to contact
Resistance changes；After the covering of cement-based powder material film, resistance is no longer influenced by humidity, in a linear relationship with temperature, is obtained by electrical devices
The electric signal obtained carrys out temperature, and purpose is measured to reach temperature.
A kind of preparation method of the face formula temperature sensor based on nano silver wire network, including step：
(1) nano silver wire is prepared using improved polyol process；
(2) nano silver wire network is prepared on an insulating substrate using spin-coating method, it is dense by controlling nano silver wire ethanol solution
Degree, dosage control the resistance of network；
(3) it utilizes sputtering method to sputter gold electrode at nano silver wire network both ends, electrode and extraneous electricity measuring Instrument is connected
It connects, test sensor resistance variation；
(4) in nano silver wire network applied atop one layer of polymeric film as protective layer.
Wherein, in step (2), the nano silver wire solution concentration is 10~500mg/L, spin coating 0.5~2ml nano silver wires
Ethanol solution.The resistance of network is controlled by controlling nano silver wire ethanol solution concentration, dosage.
Polymer film described in step (4) is dimethyl silicone polymer or epoxy resin, and preparation is all the prior art.It is poly-
Compound film controls its thickness within 1~2mm.
Compared with prior art, the present invention has the following advantages that and effect：
In the temperature sensor proposed in the present invention, when the environmental temperature is changed, the overlap joint of nano silver wire changes, and leads
Contact resistance variation is caused, then ambient temperature signal can be converted to electric signal.
Compared with prior art, temperature sensor provided by the invention has at low cost, and manufacture craft is simple, is easy to industry
Change, be suitable for face formula thermometric, there is high market value and industrialization potential.
Description of the drawings
Fig. 1 is the basic structure schematic diagram of the present invention；
Fig. 2 is preparation method flow chart of the present invention；
Fig. 3 is the temperature resistance characteristic curve of the present invention.
Fig. 4 is resistance temperature sensor temperature return curve of the present invention.
Fig. 5 is the temperature resistance characteristic curve of the present invention.
Specific implementation mode
The present invention is now illustrated with following embodiment, but is not limited to the scope of the present invention.
PDMS membrane preparation method：By polydimethylsiloxane liquid and curing agent (DOW CORNING
SYLGARD184 silicon rubber bi-components external member) in mass ratio 10：1 pours into culture dish, is stood after stirring evenly, by spin coating or
Drop coating is covered on nano silver wire network, makes its solidification within 20~30 minutes in 80~90 degree of baking ovens.
Epoxy resin membrane preparation method：Epoxy resin is coated in after being mixed with curing agent on nano silver wire network, is placed on
Make its solidification within 20~30 minutes in 80~90 degree of baking ovens.
Embodiment 1
Nano silver wire is prepared first with existing polyol process, configures 300mg/L nano silver wire ethanol solutions.
Then, above-mentioned nano silver wire solution rotating is coated on SiO using sol evenning machine2/ Si pieces surface.Spin coating 1ml concentration
For 300mg/L nano silver wire ethanol solutions.Spin speed is 500 revs/min of low speed, 10 seconds time；1000 revs/min at a high speed, the time
10 seconds.By the SiO after spin coating2/ Si pieces, which are placed in dustfree environment, to be spontaneously dried, and nano silver wire network is finally obtained.
By sputtering method gold electrode, sputtering time 100S are sputtered at nano silver wire network both ends.
Finally, in one layer of PDMS membrane of nano silver wire network applied atop as protective layer.By poly dimethyl
Siloxanes by polydimethylsiloxane liquid and curing agent (DOW CORNING SYLGARD184 silicon rubber bi-components external member) in mass ratio
10：1 after mixing, is stood after stirring evenly, and is covered on nano silver wire network by spin coating, 30 minutes in 90 degree of baking ovens
Make its solidification.
So far temperature sensor making finishes, which is 1.5 millimeters, about 2.25 square centimeters of area.
Connecting test circuit controls the temperature of sample with constant temperature humidity chamber, is tested with 2400 digital sourcemeter of Keithley
IV curves calculate resistance value.
Fig. 3 indicates the temperature resistance characteristic curve of 1 temperature sensor of the embodiment of the present invention, reflects the temperature sensing utensil
There are preferable linear relationship and larger test scope.
Fig. 4 indicates the resistance temperature response curve of 1 temperature sensor of the embodiment of the present invention, reflects the temperature sensing utensil
There are preferable response and reversibility.
Embodiment 2
Nano silver wire is prepared first with improved polyol process, configures 400mg/L nano silver wire ethanol solutions.
Then, above-mentioned nano silver wire solution rotating is coated on SiO using sol evenning machine2/ Si pieces surface.Spin coating 1.5ml is dense
Degree is 400mg/L nano silver wire ethanol solutions.Spin speed is 500 revs/min of low speed, 10 seconds time；1000 revs/min at a high speed, when
Between 10 seconds.By the SiO after spin coating2/ Si pieces, which are placed in dustfree environment, to be spontaneously dried, and nano silver wire network is finally obtained.
By sputtering method gold electrode, sputtering time 100S are sputtered at nano silver wire network both ends.
Finally, in one layer of epoxide resin polymer film of nano silver wire network applied atop as protective layer.By epoxy resin
After mixing, drop coating is covered on nano silver wire network, makes its solidification within 30 minutes in 90 degree of baking ovens for the parts AB.
So far temperature sensor making finishes, which is 2 millimeters, about 2.25 square centimeters of area.
Fig. 5 is the temperature resistance characteristic curve of 2 temperature sensor of the embodiment of the present invention.
Above embodiment be only the preferred embodiment of the present invention is described, not to the scope of the present invention into
Row limits, under the premise of not departing from design spirit of the present invention, technical side of this field ordinary engineering and technical personnel to the present invention
The all variations and modifications that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of temperature sensor based on nano silver wire network, which is characterized in that including：
1) using nano silver wire network as temperature-sensitive material；
2) electrode is sputtered at nano silver wire network both ends by ion sputtering instrument and is made；
3) nano silver wire network applied atop one layer of polymeric film is as protective layer；
4) electrode on both sides is connect with extraneous electricity measuring Instrument, test sensor resistance variation；
Nano silver wire is synthesized by polyol process, and nano silver wire network is prepared by spin-coating method, is received by controlling spin coating proceeding change silver
The resistance of nanowire network；Cement-based powder material thin film coated, network resistor change with temperature linearity, are no longer influenced by humidity, resistance with
Temperature change can restore, while thin polymer film prevents nano silver wire to be corroded.
2. the temperature sensor according to claim 1 based on nano silver wire network, which is characterized in that the polymer
Film is selected from PDMS films or epoxy resin.
3. the method for preparing nano silver wire lattice temperature sensor as claimed in claim 1 or 2, it is characterised in that step is such as
Under：
(1) nano silver wire is prepared using existing polyol process；
(2) nano silver wire network is prepared on an insulating substrate using spin-coating method, by controlling nano silver wire ethanol solution concentration, using
It measures to control the resistance of network；
(3) it utilizes sputtering method in nano silver wire network both ends sputtering electrode, electrode is connect with extraneous electricity measuring Instrument, is tested
Sensor resistance changes；
(4) in nano silver wire network applied atop one layer of polymeric film as protective layer；
Wherein, in step (2), the nano silver wire solution concentration is 10~500mg/L, using sol evenning machine by above-mentioned nano silver wire
Solution rotating is coated on insulated substrate surface, finally obtains nano silver wire network.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632140A (en) * | 2018-12-26 | 2019-04-16 | 天津大学 | A kind of temperature sensor and temperature-detecting device |
| CN110143564A (en) * | 2019-04-02 | 2019-08-20 | 上海交通大学 | The connection structure and preparation method of temperature sensor, electrode and temperature-sensitive membrane |
| CN112487628A (en) * | 2020-11-24 | 2021-03-12 | 北京邮电大学 | Single-silver nanowire structure design method based on chiral TDBC coating |
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| CN112487628A (en) * | 2020-11-24 | 2021-03-12 | 北京邮电大学 | Single-silver nanowire structure design method based on chiral TDBC coating |
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Application publication date: 20181009 |
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