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Experimental Investigation And Performance Analysis Of Resistance Type Semiconductor Gas Sensor

Posted on:2020-03-28Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y ZhouFull Text:PDF
GTID:2428330578980054Subject:Instrument Science and Technology
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With the continuous development of science,new technologies and new materials,people's material life has been constantly improved,the number of cars has increased sharply,and the number of traffic accidents caused by drunk driving is also on the rise.Therefore,the monitoring of drunk driving has attracted people's attention,and a kind of ethanol gas sensor with excellent performance is urgently needed.The resistive semiconductor gas sensor stands out from the others due to its high response value,fast response speed and low cost.In this paper,In 2O3 gas-sensitive materials are mainly used,and the degree of order and three-dimensional structure of gas-sensitive materials are taken as the entry point.The research is mainly conducted around the following contents:?1?The types and working mechanism of gas sensors had been researched,the experimental process of gas-sensitive materials conducive to improving the performance of In2O3 gas-sensitive elements had been clarified.The SBA-15 hard template method was applied to the study of In 2O3 ethanol gas sensor for the first time,and the three-dimensional ordered In2O3 gas sensor was successfully prepared.?2?A new three-dimensional In2O3 nanowire array structured gas-sensitive material was prepared by using the hard template replication technology at different centrifugal speeds,and the influence of order degree on the crystal structure,morphology and gas-sensitive performance was studied.Results showed that the high degree of order of samples showed more excellent performance of gas sensitive,under the working temperature of 320?,the sensitivity to 50×10-6 ethanol was 36.61 about twice as sensitive as exciting ethanol sensors.?3?By the nanometer technology of casting,under 350?to 650?sintering temperature,the preparation of a new three-dimensional In2O3mesoporous nanowire gas sensitive material,and the gas sensor performance was analyzed.Results showed that the sintering temperature of 450?under the In2O3 gas sensor had the highest sensitivity,the response value of 50.59at 320?for 100×10-6 ethanol.The results show that the nano-structure obtained by hard template replication technology has th e same morphology and high degree of order,and has a three-dimensional ordered channel which is conductive to gas adsorption and diffusion.
Keywords/Search Tags:gas sensor, In2O3 gas sensitive materials, nanowire structure, gas sensing property
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