CN114563114A - Preparation method of flexible touch sensor for pulse diagnosis - Google Patents
Preparation method of flexible touch sensor for pulse diagnosis Download PDFInfo
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- CN114563114A CN114563114A CN202011363961.0A CN202011363961A CN114563114A CN 114563114 A CN114563114 A CN 114563114A CN 202011363961 A CN202011363961 A CN 202011363961A CN 114563114 A CN114563114 A CN 114563114A
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- gold
- sensitive element
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000003745 diagnosis Methods 0.000 title claims abstract description 9
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 27
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 15
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 15
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 15
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims description 15
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 12
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 6
- ZGYICYBLPGRURT-UHFFFAOYSA-N tri(propan-2-yl)silicon Chemical compound CC(C)[Si](C(C)C)C(C)C ZGYICYBLPGRURT-UHFFFAOYSA-N 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 2
- 238000002791 soaking Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 229920001971 elastomer Polymers 0.000 description 8
- 239000000806 elastomer Substances 0.000 description 8
- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000003814 drug Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
Abstract
The invention discloses a preparation method of a flexible touch sensor for pulse diagnosis. Firstly, gold nanowires are prepared in a wet chemical mode, then a sensitive element is prepared on the basis of the gold nanowires, and finally the required flexible pressure sensor is obtained. The preparation method is simple in preparation process and high in sensitivity.
Description
Technical Field
The invention relates to a preparation method of a flexible touch sensor for pulse diagnosis.
Background
The pulse carries rich health condition information of human body, the traditional Chinese medicine pulse feeling diagnosis detects local and overall information of pulse conditions by means of sensors such as touch, pressure sense and vibration sense of finger tips of doctors, the modern pulse theory usually decomposes the pulse condition information sensed by the finger tips into eight dimensional characteristics such as pulse position, pulse force, pulse rate, pulse width, pulse length, fluency, tensity and the like, and the 28 common pulses of the traditional Chinese medicine are identified by analyzing the eight dimensional information. Therefore, how to effectively obtain real and comprehensive high-quality pulse condition information is one of the most basic, most critical and irretrievable problems in pulse diagnosis objective research.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a flexible touch sensor for pulse diagnosis.
The method specifically comprises the following steps:
step (1), wet chemical preparation of gold nanowires:
44mg of chloroauric acid was dissolved in 40ml of hexane, and 1.5ml of OA (oleylamine) was added, 2.1ml of TIPS (triisopropylsilane) was added after complete dissolution, and the reaction vessel was sealed with a Parafilm sealer and reacted at room temperature for 2 days to obtain an AuNWs solution.
Adding 2 volumes of ethanol into the AuNWs solution, and centrifuging (setting the centrifuge at 4500rad for 15min) to obtain a precipitate; adding 3ml of hexane into the precipitate, washing the wall of the test tube until the nano-gold is completely dissolved, adding 6ml of ethanol, and centrifuging (setting the centrifuge at 4500rad for 15min) to obtain the precipitate; the precipitate was rinsed into the tube with 1ml of hexane until the nanogold was completely dissolved, and 6. mu.l of chloroform was added to the concentrated 2ml of AuNWs solution, stored in a brown bottle and sealed with a Parafilm sealer.
Step (2), preparing a sensitive element based on gold nanowires
Putting a paper towel (8mm by 8mm) into the gold nanowire solution obtained in the step (1), taking out after waiting for 2 seconds, immersing after airing, and repeating the process for 5-10 times to prepare the flexible pressure sensitive element of the gold nanowire; and tested, and if the resistance value does not reach the predetermined setting, the above steps are repeated until the resistance value reaches the predetermined setting (between about 50 and 100 ohms).
The design of the interdigital on the PDMS membrane is mainly completed by means of photolithography. PDMS was prepared by mixing a prepolymer gel (Sylgard 184Silicone Elastomer Base) and a cross-linking agent (Sylgard 184Silicone Elastomer CuringAgent) in a weight ratio of 10: 1, the Young modulus of the pressure sensitive element is close to that of the pressure sensitive element, so that the pressure sensitive element and the pressure sensitive element can be better in tensile fit.
And (3) the flexible pressure sensor sequentially comprises a PDMS film, a sensitive element based on the gold nanowire, a Pi layer and the PDMS film from top to bottom. The sensing element based on gold nano-wire comprises paper and gold nano-wire
PDMS was prepared by mixing a prepolymer gel (Sylgard 184Silicone Elastomer Base) and a cross-linking agent (Sylgard 184Silicone Elastomer CuringAgent) in a weight ratio of 10: 1, and the Young modulus of the pressure sensitive element is close to that of the pressure sensitive element, so that better tensile fit between the pressure sensitive element and the pressure sensitive element is obtained.
The design of the interdigital is formed on the PDMS film by means of photoetching.
The preparation method is simple in preparation process and high in sensitivity.
Drawings
Fig. 1 is a PDMS interdigitated structure.
Fig. 2 is a structural view of the pressure sensitive element.
Detailed Description
The invention is further analyzed with reference to the following specific examples.
A preparation method of the flexible touch sensor for pulse diagnosis specifically comprises the following steps:
step (1), wet chemical preparation of gold nanowires:
44mg of chloroauric acid was dissolved in 40ml of hexane, and 1.5ml of OA (oleylamine) was added, 2.1ml of TIPS (triisopropylsilane) was added after complete dissolution, and the reaction vessel was sealed with a Parafilm sealer and reacted at room temperature for 2 days to obtain an AuNWs solution.
Adding 2 volumes of ethanol into the AuNWs solution, and centrifuging (setting a centrifuge at 4500rad for 15min) to obtain a precipitate; adding 3ml of hexane into the precipitate, washing the wall of the test tube until the nano-gold is completely dissolved, adding 6ml of ethanol, and centrifuging (setting the centrifuge at 4500rad for 15min) to obtain the precipitate; the precipitate was rinsed into the tube with 1ml of hexane until the nanogold was completely dissolved, and 6. mu.l of chloroform was added to the concentrated 2ml of AuNWs solution, stored in a brown bottle and sealed with a Parafilm sealer.
Step (2), preparing a sensitive element based on gold nanowires
Putting a paper towel (8mm by 8mm) into the gold nanowire solution obtained in the step (1), taking out after waiting for 2 seconds, immersing after airing, and repeating the process for 5-10 times to prepare the flexible pressure sensitive element of the gold nanowire; and tested, and if the resistance value does not reach the predetermined setting, the above steps are repeated until the resistance value reaches the predetermined setting (between about 50 and 100 ohms).
The design of the interdigitated fingers on the PDMS film as in fig. 1 is mainly done by means of photolithography. PDMS was prepared by mixing a prepolymer gel (Sylgard 184Silicone Elastomer Base) and a cross-linking agent (Sylgard 184Silicone Elastomer CuringAgent) in a weight ratio of 10: 1, and the Young modulus of the pressure sensitive element is close to that of the pressure sensitive element, so that better tensile fit between the pressure sensitive element and the pressure sensitive element is obtained.
And (3) sequentially comprising a PDMS film, a sensing element based on the gold nanowire, a Pi layer and the PDMS film from top to bottom as shown in the figure 2. The sensing element based on gold nano-wire comprises paper and gold nano-wire
PDMS was prepared by mixing a prepolymer gel (Sylgard 184Silicone Elastomer Base) and a cross-linking agent (Sylgard 184Silicone Elastomer CuringAgent) in a weight ratio of 10: 1, the Young modulus of the pressure sensitive element is close to that of the pressure sensitive element, so that the pressure sensitive element and the pressure sensitive element can be better in tensile fit.
And forming an interdigital design on the PDMS film by means of photoetching.
Because the interface of the pressure sensor is a gold-plated film, the final characteristics of the sensor can be influenced by the adhesion between the interface and a substrate material and the adhesion between the interface and a lead, the packaging of the interface is a key technology, and a flexible metal patch is adopted to use industrial conductive adhesive to adhere and solidify a metal lead on a flexible electrode in one step, so that errors caused by the change of the contact resistance of the lead are reduced. Finally, a special die is designed, and a manufacturing mode is solidified to ensure the consistency of the sensor.
The manufactured sensor is tested for performance by a pressure tester. The pressure gauge is connected with the Z axis of the variable step. The change in capacitance of the sensor is measured by a capacitance meter. The sensor is associated with the variable stage and corresponds to the precise x-y table mounted on the stage. The dynamometer moves downwards along the Z axis of the moving platform, and when the dynamometer contacts the bulge of the sensor, the sensor is compressed to cause deformation of the medium layer. The bumps provide a point of contact for the force gauge and create a uniform pressure against the media layer. This allows to obtain a relationship between the force and the capacitance value.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.
Claims (1)
1. A preparation method of a flexible touch sensor for pulse diagnosis is characterized by comprising the following steps:
step (1), wet chemical preparation of gold nanowires:
dissolving 44mg of chloroauric acid in 40ml of hexane, adding 1.5ml of OA (oleylamine), adding 2.1ml of TIPS (triisopropylsilane) after complete dissolution, sealing the reaction vessel and reacting at room temperature for 2 days to obtain an AuNWs solution;
adding 2 volumes of ethanol into the AuNWs solution, and centrifuging to obtain a precipitate; adding 3ml of hexane into the precipitate, washing the wall of the test tube until the nano-gold is completely dissolved, adding 6ml of ethanol, and centrifuging to obtain the precipitate; adding 1ml of hexane into the precipitate to wash the test tube until the nano-gold is completely dissolved, adding 6 mu l of chloroform into the concentrated 2ml of AuNWs solution, preserving in a brown bottle and sealing;
step (2), preparing a sensitive element based on gold nanowires
Putting a paper towel into the gold nanowire solution obtained in the step (1), taking out after waiting for 2 seconds, soaking after airing, and repeating the process for 5-10 times to prepare a flexible pressure sensitive element of the gold nanowire;
the flexible pressure sensor sequentially comprises a PDMS film, a sensitive element based on the gold nanowire, a Pi layer and the PDMS film from top to bottom; the sensitive element based on the gold nanowires comprises paper and the gold nanowires.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363961.0A CN114563114A (en) | 2020-11-27 | 2020-11-27 | Preparation method of flexible touch sensor for pulse diagnosis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363961.0A CN114563114A (en) | 2020-11-27 | 2020-11-27 | Preparation method of flexible touch sensor for pulse diagnosis |
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| Publication Number | Publication Date |
|---|---|
| CN114563114A true CN114563114A (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011363961.0A Pending CN114563114A (en) | 2020-11-27 | 2020-11-27 | Preparation method of flexible touch sensor for pulse diagnosis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116835523A (en) * | 2023-08-31 | 2023-10-03 | 常州天策电子科技有限公司 | Preparation method of thin film pressure sensor based on nanowire array and pressure sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2900196A1 (en) * | 2014-08-13 | 2016-02-13 | The Royal Institution For The Advancement Of Learning / Mcgill University | Nanowire enabled paper based haptic interfaces |
| WO2017091151A1 (en) * | 2015-11-25 | 2017-06-01 | Nanyang Technological University | Pressure sensing electronic device, methods of forming and operating the same |
| CN107287684A (en) * | 2017-05-31 | 2017-10-24 | 华南理工大学 | A kind of high highly sensitive quick sensing fiber of flexible force of stretching and preparation method thereof |
-
2020
- 2020-11-27 CN CN202011363961.0A patent/CN114563114A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2900196A1 (en) * | 2014-08-13 | 2016-02-13 | The Royal Institution For The Advancement Of Learning / Mcgill University | Nanowire enabled paper based haptic interfaces |
| WO2017091151A1 (en) * | 2015-11-25 | 2017-06-01 | Nanyang Technological University | Pressure sensing electronic device, methods of forming and operating the same |
| CN107287684A (en) * | 2017-05-31 | 2017-10-24 | 华南理工大学 | A kind of high highly sensitive quick sensing fiber of flexible force of stretching and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| SHU GONG, ET AL.: "A wearable and highly sensitive pressure sensor with ultrathin gold nanowires", NATURE COMMUNICATIONS, 4 February 2014 (2014-02-04), pages 1 - 8 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116835523A (en) * | 2023-08-31 | 2023-10-03 | 常州天策电子科技有限公司 | Preparation method of thin film pressure sensor based on nanowire array and pressure sensor |
| CN116835523B (en) * | 2023-08-31 | 2023-11-28 | 常州天策电子科技有限公司 | Preparation method of thin film pressure sensor based on nanowire array and pressure sensor |
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