Three-dimensional carbon-based pressure sensor making method

A pressure sensor, carbon-based technology, used in sensors, medical science, diagnostic recording/measurement, etc., can solve the problems of high process requirements, large environmental pollution, poor portability, etc., and achieve good biocompatibility, high sensitivity, and structure. simple effect

Pending Publication Date: 2016-07-20

南京清辉新能源有限公司

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AI-Extracted Technical Summary

Problems solved by technology

However, gold nanowire pressure sensors still have disadvantages such as high price, complex structure, and high process requirements.

[0007] In short, the disadvantages of existin...

Abstract

The invention discloses a three-dimensional carbon-based pressure sensor making method, and relates to the technical field of pressure sensors.The method comprises the steps that foam metal nickel is put into a chemical vapor deposition furnace, methane and hydrogen are introduced for a reaction, and graphene is obtained; foam metal nickel which obtains graphene in the first step is soaked in a mixed aqueous solution of ferric nitrate and hydrochloric acid, foam metal nickel is removed, and foamed graphene is obtained; foamed graphene is washed with water, and drying is conducted; carbon-based fibers are arranged on the top and bottom of foamed graphene respectively to serve as a flexible electrode material; polydimethylsiloxane is poured on foamed graphene and carbon-based fiber flexible electrodes, curing is conducted, and a pressure sensor device is obtained.The pressure sensor has good biocompatibility with a human body and can be closely attached to the skin of the human body to collect physiological signals quantificationally in real time.

Application Domain

Diagnostic recording/measuringSensors

Technology Topic

Cvd grapheneBiocompatibility Testing +14

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Examples

Experimental program(3)

Example Embodiment

[0027] The schematic flow chart of the present invention is as follows figure 1 As shown, the specific steps of the preparation method of the three-dimensional carbon-based pressure sensor include:

[0028] Step 1, placing the nickel foam in a chemical vapor deposition furnace, feeding methane and hydrogen to react, and preparing graphene;

[0029] Step 2, soak the metallic nickel foam prepared with graphene obtained in step 1 in the mixed aqueous solution of ferric nitrate and hydrochloric acid, remove the metallic nickel foam, and obtain foamed graphene;

[0030] Step 3, washing the graphene foam with water, then drying;

[0031] Step 4. Place carbon-based fibers on the top and bottom of the foamed graphene as a flexible electrode material;

[0032] Step 5: Pouring polydimethylsiloxane on the foamed graphene and the carbon-based fiber flexible electrode to solidify into a pressure sensor device.

[0033] The prepared pressure sensor was subjected to extrusion-recovery aging experiments through a self-built stepping machine. After 50,000 cycles of testing, the current flowing through the device becomes very stable, which can accurately reflect the relationship between the external mechanical force on the device and the device current.

[0034] The aged pressure sensor was used for two tests:

[0035] (i) Monitor weak external vibration: monitor different vibration states, such as the regular vibration of a mobile phone. According to the vibration of the mobile phone, the pressure sensor will draw a curve of the current value of the device over time. Different vibration frequencies of the mobile phone will correspond to the curves of different currents of the device over time.

[0036] (ii) Monitoring various physiological signals, such as pulse beat, sound vibration, etc.: Use pressure sensors to monitor the pulse beat state of the human body when awake and sleeping, and realize the collection of physiological signals. In addition, if the sensor is attached to the throat of the human body, the voice of speech can be monitored in real time.

Example Embodiment

[0038] Implementation Case 1: Testing of Physiological Signals

[0039] Attach the prepared pressure sensor to the wrist pulse, connect the source meter,

[0040] (i) Monitor the pulse beat when awake and the pulse beat when sleeping.

[0041] (ii) Fit the pressure sensor near the throat, read it from 1 to 10, and the digital source meter records the curve of the current flowing through the device as a function of time, such as figure 2 shown. Pick out three numbers 1, 3, and 5, read each number three times, compare the original curve from 1 to 10, and find that their current waveforms are consistent. This shows that our pressure sensor is very sensitive to detect the weak vibration pressure generated when speaking.

Example Embodiment

[0042] Implementation case two

[0043] Put the pressure sensor on the iPhone 6 and turn the iPhone 6 into vibration mode. When dialing the mobile phone, the pressure sensor detects the vibration waveform of the mobile phone in different vibration modes, and obtains stable current-time diagrams of different waveforms, such as image 3 shown.

[0044]The preparation method of the invention is simple and feasible, the raw materials are cheap, and the preparation process is simple. First, the pressure sensor is prepared by preparing a novel carbon-based material foamed graphene, and the material preparation method is mature, cheap and easy to operate. After that, the prepared foamed graphene is combined with the flexible carbon fiber electrode, and then the polydimethylsiloxane PDMS is poured, and the pressure sensing device is prepared by curing.

[0045] It can be seen from the above-mentioned specific embodiment that the present invention is sensitive to low pressure:

[0046] 1. The pressure sensor of the present invention can feed back the difference in the beating pattern of the pulse during rest and when awake.

PUM

Property	Measurement	Unit
Thickness	1.0 ~ 12.0	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple structure
low cost

Three-dimensional carbon-based pressure sensor making method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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