The Preparation And Study On The Performance Of Silver Nanowire-based Gird Flexible Network Transparent Electrodes And Piezoresistive Sensor

Nowadays,with the development of science and technology,transparent conductive electrodes,as an essential component of many photovoltaic devices,have become more demanding.Silver nanowire(AgNW)-based transparent electrodes are expected to replace traditional indium tin oxide(ITO)as a new generation of transparent electrodes due to their good flexibility and excellent optoelectronic properties,which have attracted the attention of experts and scholars.Secondly,because of its wide application in wearable electronic devices,medical fields,computer fields,and artificial intelligence fields,flexible sensors have also received great attention,attracting researchers to study their sensitivity and linearity.The thesis conducts research work in the following two aspects:1.AgNWs-based transparent electrodes were prepared by spraying on a transparent polyimide(PI)film as a substrate.However,the film prepared by the traditional spraying method has the disadvantages of uneven distribution of nanowires,excessive surface roughness,which may adversely affect the performance of subsequent devices,and because of the large contact resistance between nanowires,the sheet resistance of the film can be further reduced.Therefore,a improving spraying method,by introducing the DC electric field during the spraying process and the voltage value is optimized,so that during the process,AgNWs forms a regular network arrangement due to electrostatic repulsion,the nanowires distributed more uniformly on the substrate,which reduces the surface roughness of the film.And after the network film formed,plasma post-processing was introduced.The nanowires were welded by optimizing the power and time of plasma processing,which further reduced the surface resistance of the film,and finally produced high figure of merit(FOM)flexible AgNWs network transparent electrode.After a series of characterization and testing,the flexible network arrangement could bring moiré-free,and the film can still maintain good photoelectric performance after multiple bending tests,which proves that the film has a huge application in the flexible electronic devices.2.A simple immerse-drying method was used to prepare the flexible MXene-AgNWs piezoresistive sensor and the concentration of AgNWs solution was optimized.After testing,it was found,compared with the traditional AgNWs piezoresistive sensor,that MXene-AgNWs piezoresistive sensors has higher sensitivity in the whole pressure region.Further,it was found that adding MXene can improve the linearity of the sensor significantly after analyzing the Pearson’r of the current change rate and pressure change amount of the sensor.We attributed the improvement of the sensor’s performance to the ohmic contact of the conductive material is more sufficient after adding MXene material,so it had higher linearity.And with the coverage of MXene on AgNWs,AgNWs was more difficult to fall off,so that the life of the device was increased.And the preparation method is so simple,which has the potential for large-scale commercial production.