Liquid metal patterning technology-based strain sensor and virtual keyboard thereof

A strain sensor and liquid metal technology, which is applied in the transmission of sensing components, instruments, graphic reading and other directions using electric/magnetic devices, which can solve the problems of limiting equipment flexibility, deviation, and complex sensors, and achieve the effect of simple and efficient input.

Active Publication Date: 2019-01-22
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the data and information input by this method greatly deviates from the traditional input style, and cannot be adapted quickly, and the sensor part will appear complicated due to the limitation of the principle, which seriously limits its light and simple requirements. At the same time, the device will still be There is a rigid circuit board, which severely limits the flexibility of the device

Method used

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  • Liquid metal patterning technology-based strain sensor and virtual keyboard thereof
  • Liquid metal patterning technology-based strain sensor and virtual keyboard thereof
  • Liquid metal patterning technology-based strain sensor and virtual keyboard thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This example is used to illustrate the preparation method of the strain sensor of the present invention.

[0084]Put 1 g of liquid indium-gallium eutectic alloy (EGaIn Ga 75.5%wt In 24.5%wt) in 1 ml of n-octanol solution, and use an ultrasonic cell breaker to sonicate for 60s at an amplitude of 30%, to obtain a gray liquid metal suspension. Turbid liquid, the metal is dispersed into small particles with an average particle size of 1500nm. The core of the small particles is liquid metal, and the outside is covered by a thin oxide film. In order to achieve complete transfer, the PET film was selected as the original pattern layer, and the PDMS solution was prepared according to the ratio of PDMS prepolymer: curing agent mass ratio of 10:1, and fully mixed with a homogenizer. fabricated on PET film using screen printing figure 1 the graph shown. And the line width was measured with a high-definition video microscope, and the width was 200 microns. Place the pattern on ...

Embodiment 2

[0087] This example is used to illustrate the preparation method of the strain sensor of the present invention.

[0088] Put 2g of liquid indium-gallium-tin alloy (In(22)Ga(68)Sn(10)) in 1ml of 1,4-butyrolactone, and use an electric grinder to rotate at the maximum speed (sixth gear, 11600rpm) at high speed The liquid metal is sheared to obtain a liquid metal suspension, and the metal is dispersed into small particles with an average particle diameter of 2400nm. The core of the small particles is liquid metal, and the outside is covered by a thin oxide film. In order to achieve complete transfer, glass is selected as the original pattern layer, and the elastomer solution is prepared according to the mass ratio of Smooth-On Ecoflex 0030 A component and B component at a ratio of 1:1, and fully mixed with a glue homogenizer. Wave-shaped sensor patterns were fabricated on glass using screen printing technology. The line width was measured with a high-definition video microscope ...

Embodiment 3

[0090] This embodiment is used to illustrate the preparation method of the strain sensor patch of the present invention.

[0091] Prepare the PDMS solution according to the ratio of PDMS prepolymer: curing agent mass ratio of 10:1, and add 5, 10, 15, 20 microliters of PEIE (ethoxylated polyethyleneimine polyethoxyethylene imine) per 10 g of PDMS solution Solution, after fully mixing, cast the solution on the pattern of the PET film after drying in Example 1. After defoaming in a vacuum oven at room temperature for 10 minutes, place it in an oven at 80 degrees Celsius for 2 hours. When the solution was solidified, the PEIE-doped PDMS was carefully peeled off from the PET, and the desired liquid metal pattern was transferred onto the PEIE-doped PDMS. The PEIE-doped PDMS itself is sticky and can fit tightly on gloves and skin. The higher the content of PEIE, the greater the viscosity of PDMS itself. And it has good conductivity, and its resistance changes linearly with the inc...

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Abstract

The invention provides a liquid metal patterning technology-based strain sensor and a virtual keyboard, preparation method and application thereof. A glove is manufactured by using a liquid metal patterning technology, so that the method is simple and feasible and mass production can be realized easily. The glove can be worn on a hand to accurately monitor the hand actions in real time; and furthermore, the glove can be used as a virtual keyboard to realize convenient and rapid input of characters, so that the difficulty that the traditional keyboards are large in volume and difficult to carryis overcome. The glove is full-flexible, so that a rigid printed circuit board is avoided and good flexibility and tensile property are provided. The input style of the glove keyboard is close to theinput manner of traditional QWERTY keyboards, so that when being compared with existing glove keyboards, the glove keyboard is easy to be accepted by consumers. The strain sensor can be made into a patch to be pasted at each joint so as to recognize the actions of the whole body.

Description

technical field [0001] The invention belongs to the field of electronic circuits, and in particular relates to a strain sensor based on liquid metal patterning technology and a virtual keyboard thereof, a preparation method and application thereof. Background technique [0002] For a long time, the monitoring of motion has played an important role in the fields of medical treatment, machinery, and film industry. Now the most common method for monitoring motions is to attach sensors to key points on the measured object and use a set of cameras to recognize motions. This method is very complicated and expensive, and requires large-scale equipment support. Another type of motion capture sensor is a resistive or capacitive sensor that is attached to a joint and relies on a change in resistance or capacitance to recognize motion. This kind of sensor is simple and light, but the motion resolution is low. In most cases, it can only recognize the two states of finger bending and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/16G06F3/01
CPCG06F3/014G01D5/16
Inventor 蒋兴宇唐立雪宓含冰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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