Research On The Preparation And Sensing Properties Of Electrospun Micro/Nano Fiber

Since the beginning of the 21 st century,optical devices are becoming more and more important in our lives.With the advancement of science and the development of industry,optical devices are required to develop in the direction of better performance and smaller device dimensions.Micro/nano optical waveguide is an important part of the micro/nano photonic devices and has many advantages,such as compact,low loss and constraints ability,etc.It has great development potential in sensor,communication and photoelectric devices.In this dissertation,we mainly investigate the fabrication process of micro/nano fiber and its sensing performance.In this thesis,the preparation method of PMMA polymer micro/nano fiber based on electrostatic spinning technology is studied.Through receiver of indium tin oxide,parallel micro/nano optical fiber is arranged in the receiving device.Therefore,it is possible to arrange multiple micro/nano fibers directly on the optical waveguides which used in the sensor without transferring micro/nano fibers to achieve the purpose of in-situ measurement.The humidity sensor made by electrostatic spinning micro/nano fiber is studied in this dissertation.The main basis of the sensor is the evanescent wave transmission and large specific surface area of multiple PMMA micro/nano fibers deposited between indium tin oxide glasses.The sensing performance test results showed that the output intensity of the sensor is inversely proportional to the relative humidity,and the linearity and repeatability are good.When the relative humidity increased from 35% to 85%,the response time of the sensor with spinning time of 240 s is 8.9 s,when the relative humidity decreased from 85% to 35%,the response time of the sensor is 96 s.Compared with the sensor response curve of different electrostatic spinning time,the longer the spinning time,the more sensitive the sensor is.