Research On The Preparation Technology Of Flexible Wearable Electronic Devices Based On Electrospray Printing Assisted Direct Writing

The preparation technology of flexible wearable electronic devices is a major problem that restricts its development.Patterning flexible conductive materials is one of the methods to prepare flexible wearable electronic devices.Electrojet printing assisted direct writing technology can be used for flexible and convenient processing of micro and nano Level precision pattern.This thesis focuses on the high-precision patterned deposition technology in the process of EHD(Electro-hydro Dynamics)-assisted direct printing.This process is used to create a paraffin sacrificial male mold for the microchannel of a flexible wearable electronic device,and then the flexible conductive material is introduced into the microchannel to prepare the flexible electronic device.And carried out the performance test and application research of flexible electronic devices.The main research contents of this thesis include:(1)Research the theoretical basis and numerical simulation of EHD-assisted direct printing,and reveal the forming mechanism and action mechanism of the hot-melt EHDassisted direct printing.(2)In response to the need for printing paraffin at the expense of male mold preparation,the hot-melt EHD-assisted direct printing experiment platform was builded,and the temperature precision control system and the negative pressure system to prevent molten droplets from dripping were designed,using the continuous cone jet mode to carry out experimental research on the influence of the main system parameters of the hot-melt EHDassisted direct printing on the pattern of paraffin wax sacrificial male mold and its law.(3)Select the optimal process parameters,working voltage 1300 V,speed 10mm/s to prepare flexible sacrificial male mold microchannel,remove paraffin to sacrifice male mold,prepare flexible microchannel,and study two methods of introducing flexible conductive material liquid metal.(4)The conductive liquid metal pattern is subjected to performance testing experiments and a flexible wireless capacitive sensor integrated with a flexible liquid metal coil is designed and prepared.Its sensitivity and resonance frequency are 5.11MHz/N and59.375 MHz.The wearable application of this flexible wireless capacitive sensor is further studied,and its development prospects in the field of human monitoring are explored.