Preparation methods for composite nanofiber membrane and flexible strain sensor

Abstract

The invention discloses preparation methods for a composite nanofiber membrane and a flexible strain sensor. The preparation method for the composite nanofiber membrane comprises the following steps of firstly dissolving polymer particles in an organic solvent to prepare a spinning solution; transferring the spinning solution into an injector, extruding the spinning solution through the injector, and adjusting relevant parameters of electrostatic spinning to enable jet flow to be stable so as to collect a nanofiber membrane on a collecting plate; after silver nanowire dispersion liquid is diluted and subjected to water bath ultrasonic dispersion, depositing a metal nanowire layer on the pre-stretched nanofiber membrane through a vacuum-assisted suction filtration method; and increasing the binding force between nanowires and the binding force between the nanowires and an elastic substrate through high-temperature annealing. The prepared flexible strain sensor has a large sensing range and can be used for detecting deformation such as bending, stretching and twisting.

Description

technical field [0001] The invention belongs to the technical field of flexible strain sensors, and in particular relates to a preparation method of a composite nanofiber membrane and a flexible strain sensor. Background technique [0002] Strain sensor is a kind of important sensor device. When the sensor device is subjected to external force, it will deform itself, resulting in a change in the resistance or capacitance of the device. By detecting changes in these physical quantities, the function of strain detection is realized. In recent years, flexible and wearable strain sensors have gradually become a research hotspot in the field of strain sensors. This flexible strain sensor has good sensing characteristics such as sensitivity, repeatability and stability, and has become a core device in the fields of electronic skin, wearable electronic devices, and flexible human-computer interaction devices. With the further development of social informatization, various new dev...

AI Technical Summary

Problems solved by technology

However, flexible strain sensors prepared in this way usually cannot combine high sensitivity and large detection range

In order to improve the detection range, it is often necessary to increase the amount of conductive nanomaterials, which will lead to a decrease in sensitivity and bring about cost problems

How to prepare flexible sensors with large sensing range and high sensitivity while reducing the amount of expensive conductive nanomaterials is still a big challenge

At the same time, the bonding force between solid conductive nanomaterials and elastic substrates is usually weak, and the conductive network is prone to breakage during the stretching process, which makes the sensing mechanism invalid, resulting in a small sensing range of the flexible strain sensor.

Therefore, while reducing the amount of expensive conductive nanomaterials and ensuring the sensitivity of the sensor, it is still a big challenge to prepare a flexible strain sensor with a large sensing range.

Images