Preparation Of Degradable Transparent Electrode And Capacitance Sensor Based On Copper Nanowires

A sensor is a detection device and an indispensable part of electronic equipment.In recent years,the rapid development of wearable and disposable electronic devices and people’s increasing awareness of environmental sustainability have put forward higher and higher new requirements for the natural degradability of current electronic systems.Degradable and ultra-flexible sensors are an important part of wearable devices,but their preparation is a challenge.In this paper,a biodegradable conductive electrode with excellent mechanical stability,chemical stability and photoelectric performance is prepared by studying the preparation method of the degradable conductive electrode.The preparation of high-sensitivity and biodegradable flexible capacitive sensor is done through studying the preparation of the dielectric layer and the encapsulation method of the capacitive sensor.The main contents and conclusions are as follows:1.The high-performance degradable Cu NWs/chitosan composite transparent conductive electrodes are prepared by spraying process at room temperature.The composite films with a figure of merit of 143.7（sheet resistance:14.1Ω/sq,light transmittance:83.7%）were prepared by changing the distribution density of Cu NWs.After ultrasonic,bending,heating and tape tests,the sheet resistance of the composite films did not change significantly.In addition,under natural conditions,the composite film can be completely dissolved in urban tap water containing 2%acetic acid after 10days,showing good natural degradability.Finally,a flexible degradable transparent heater based on Cu NWs/chitosan composite films offers an immediate response and switch characteristics.In addition to heater,the composite films may also find an application potential as the conductive electrodes of electroluminescent device,which can be naturally degradable.2.Glycerol and chitosan are prepared according to a certain mass ratio to prepare a flexible and biodegradable glycerol/chitosan composite film.The composite film with different elongation at break and tensile strength was prepared by changing the mass ratio of glycerin and chitosan.The experimental results show that the best elastic composite films are obtained when the mass ratio of glycerin to chitosan is 2:1,and the elongation at break reaches to 25%.3.Glycerin/chitosan films with a micro-protrusion structure were molded by sandpaper to act as the dielectric layer of the capacitive sensor.The sensitivity of the prepared biodegradable sensors reache the maximum when the mass ratio of glycerol to chitosan is 2:1,which is 1.7 k Pa^-1,which is significantly higher than that of the non-convex sensor.The flexible sensors have a fast response time of about 180 ms.After1700 repeatability tests,the performance change is not obvious,and it has good repeatability.In addition,under natural conditions,the sensor can be completely dissolved in urban tap water containing 0.02%acetic acid and snail enzyme after 5 days,showing excellent natural degradability.