Gas Sensitivities Of Low Temperature Sintering And Laser Sintering Nano-ZnO And Its Application Research

ZnO nanoparticals were produced by renovated hybrid induction and laser heating(HILH). Based of this raw material, ZnO nanoparticals gas sensors were prepared bylow temperature sintering and laser sintering. Testing the effects on gas sensorsensitivites to volatile organic compounds (VOCs) by different process parametersand using gas sensor arrays by different doped ZnO gas sensors to discriminate VOCs.were also studied. Needle-shaped ZnO nanoparticals were formed by hybrid inducton and laserheating (HILH). Compared with the gas sensitivity of multi-shaped ZnO andcommercially granular ZnO, needle-shaped ZnO has the best gas-sensor properties:the maximum sensitivity temperature is reduced and the time of response-recovery isshortened. The gas-sensing properties are strong dependent on the morphology, sizeand aggregation of raw powder as well as the microstructure of sintered thick films. Through low temperature sintering and laser sintering of nano- ZnO, it found thatand its sensitivity decreased with the grain size of ZnO increasing when the sinteringtemperature increased in the range of 200-550℃. At 300℃, the sensitivity is highest.When ZnO thick films were sintered by laser with output power 60W and 70W, thegrain size grew, thick film became compact and its sensitivity decreases as thescanning time increased. The sensitivity of thick films sintered at 70W is obviouslyhigher than that at 60W at the same scanning time. The sensor array are composed by ZnO gas device. This sensor array was used todiscriminate ethanol, acetone and benzene. In the first part of this paper, the nano-ZnO material and its application in gas IIsensor at home and aboard have been summarized before the purpose and importanceof our research have been presented. In the second part, the preparation of nano- ZnOmaterial and its gas sensitivity are investigated. In the third part, it is the kernel of thepaper. Introducing different process parameters and their effects on gas sensitivitiesare discussed, and the microstructure of the gas sensor has been examined. In thefourth part, an example of using ZnO gas sensor array was given.