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Preparation method of portable self-powered hydrogel strain sensor

A strain sensor and hydrogel technology, applied in the field of sensors, can solve problems such as unfavorable portability of equipment, and achieve the effects of easy miniaturization design, simple and easy preparation method, and increased portability

Active Publication Date: 2020-01-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of a portable self-powered hydrogel strain sensor based on the principle of primary batteries, aiming at the disadvantages that most of the hydrogel sensors reported so far need to be driven by an external power supply, which is not conducive to the portability of the equipment.

Method used

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  • Preparation method of portable self-powered hydrogel strain sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of hydrogel

[0023] Dissolve gelatin and tannic acid in deionized water at 80°C at a mass ratio of 0.7:1, stir for two hours, and cool the resulting precipitate to form the target hydrogel;

[0024] (2) Construction of primary battery

[0025] Attach the zinc sheet as the negative electrode material of the galvanic battery and the copper sheet as the positive electrode material of the galvanic battery on both ends of the hydrogel to form the galvanic battery;

[0026] (3) Preparation of self-powered strain sensors;

[0027] Connect the 100Ω fixed value resistor to the positive and negative electrodes of the primary battery, the two ends of the fixed value resistor are the signal output points, and the output signal is a voltage signal, which can realize the preparation of self-powered strain sensors.

Embodiment 2

[0029] (1) Preparation of hydrogel

[0030] Dissolve gelatin and tannic acid in deionized water at 80°C at a mass ratio of 0.9:1, stir for two hours, and cool the obtained precipitate to form the target hydrogel;

[0031] (2) Construction of primary battery

[0032] Attach the zinc sheet as the negative electrode material of the galvanic battery and the copper sheet as the positive electrode material of the galvanic battery on both ends of the hydrogel to form the galvanic battery;

[0033] (3) Preparation of self-powered strain sensors;

[0034] Connect the 1kΩ fixed value resistor to the positive and negative electrodes of the primary battery, the two ends of the fixed value resistor are the signal output points, and the output signal is a voltage signal, which can realize the preparation of self-powered strain sensors.

Embodiment 3

[0036] (1) Preparation of hydrogel

[0037] Dissolve gelatin and tannic acid in deionized water at 80°C at a mass ratio of 0.7:1, stir for two hours, and cool the resulting precipitate to form the target hydrogel;

[0038] (2) Construction of primary battery

[0039] Attach the zinc sheet as the negative electrode material of the primary battery and the air electrode as the positive electrode material of the primary battery to the two ends of the hydrogel to form the primary battery;

[0040] (3) Preparation of self-powered strain sensors;

[0041] Connect the 100Ω fixed value resistor to the positive and negative electrodes of the primary battery, the two ends of the fixed value resistor are the signal output points, and the output signal is a voltage signal, which can realize the preparation of self-powered strain sensors.

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Abstract

The invention discloses a preparation method of a portable self-powered hydrogel strain sensor. The preparation method mainly comprises the following steps: selecting flexible hydrogel with excellenttensile property as an electrolyte, respectively assembling metal zinc sheets at two ends of the flexible hydrogel as negative electrodes, and assembling metal copper sheets as positive electrodes, soas to construct a flexible hydrogel battery; and then connecting a constant value resistor between the positive electrode and the negative electrode of the battery as a signal output end, so as to construct the strain sensor. By virtue of conversion from chemical energy to electric energy between the positive electrode and the negative electrode of the battery, voltage signals, namely detection signals of the sensor, can be detected at two ends of the constant value resistor. When a hydrogel material as a main substrate deforms under the action of external force, the change can cause change of an internal resistance value, so that the voltage at the output end is changed. Therefore, the change of the external force can be monitored by detecting the voltage signals. Meanwhile, due to the self-powered effect of the hydrogel battery, the strain sensor does not need an external power supply, can be prepared in a miniaturized manner and has good portability.

Description

Technical field [0001] The invention relates to a method for preparing a strain sensor, and belongs to the field of sensors. In particular, it relates to a design and preparation method of a self-powered strain sensor that does not require an external power source, is portable, and is based on the principle of a galvanic battery. Background technique [0002] The hydrogel-based strain sensor can convert the shape change of the hydrogel caused by small mechanical stimuli (such as pressure and tension) into a measurable electrical signal. At the same time, because the hydrogel has good stretchability and flexibility, The characteristics of biocompatibility and self-repairing properties make hydrogel-based strain sensors good in preparing electronic devices related to human health, such as pulse detectors, soft robots, super capacitors and artificial skin. Potential application prospects have received more and more attention. So far, the hydrogel-based strain sensors that have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16C08J3/075C08L89/00C08K5/1545
CPCC08J3/075C08J2389/00C08K5/1545G01B7/18
Inventor 李立东唐馥王杰
Owner UNIV OF SCI & TECH BEIJING
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