聚酰亚胺/石墨烯改性复合材料对氢气传感器气敏性能的优化OA

In order to effectively optimize the gas sensing performance of hydrogen sensors,the article studied the optimization effect of polyimide/graphene oxide(PI/GO)modified composites on the gas sensing performance of hydrogen sensors.Using flake graphite and sodium nitrate as the raw materials,graphene oxide(GO)solution was prepared by Hummers method,mixed with polyimide(PI),and different PTFE doping ratios were designed to prepare PI/GO modified composites.The composite without PTFE was used as the control group to fabricate a hydrogen gas sensor.By assembling an intelligent microanalysis system and a gas sensor in a test box,the optimization effect of PI/GO modified composites on the gas sensing performance of hydrogen sensors under different PTFE doping ratios was analyzed.The results show that the addition of PTFE has a significant optimization effect on the gas sensing performance of PI/GO modified composites.When the PTFE doping mass fraction is 5%,the absolute value of the gas sensing response of the sensor reaches 0.05,the sensitivity reaches 0.5 or above,the voltage change amplitude reaches 350 mV or above,the limit of detection(LOD)value is higher than 7.5 μmol/mol,the hydrogen induced lattice strain rate is higher than 1.4%,and the optimization effect of gas sensing performance is the best.