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Structure Design Of Porous Metal Oxide Semiconductor And Application Of Sensors Based On It

Posted on:2018-02-25Degree:MasterType:Thesis
Country:ChinaCandidate:X S WangFull Text:PDF
GTID:2348330515982953Subject:Radio Physics
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With the rapid development of China's economy,environmental problems have become increasingly prominent,especially air pollution problems,which is getting more and more attention.In order to detect the toxic and harmful gases in air,gas sensors have been widely used in our daily lives.In2O3 has been widely used in many fields especially in the field of high sensitivity gas sensors.In2O3 can be used as an excellent carrier for doping,and the gas sensing performance is improved after the incorporation of other elements.Rare earth modified oxide compounds have been extensively studied in the fundamental and technical field over the past decades due to their particular characteristics arising from the 4f electronic shells.However,the studies on rare earth modified semiconductor oxide sensors are quite rare.In this paper,rare earth doped In2O3 nanotubes,porous nanotubes and ruptured porous nanotubes were prepared by the simple method of electrospinning and subsequent calcination.Gas sensors based on the as-synthesized materials were fabricated and studied for their gas sensing properties.Moreover,we have fabricated flower-like porous Zn O,and gas sensors based on Zn O are manufactured.The details are as follows:1.The optimum operating temperature of Er-doped In2O3 nanotubes is 260?,and the sensitivity of sensor to 20 ppm of formaldehyde is 12,the average response and recovery times are 5 and 38 s,respectively.2.The optimum operating temperature of Yb-doped In2O3 nanotubes is 230?,the sensitivity of sensor to 100 ppm of formaldehyde is 69.8,the average response and recovery times are 4 and 84 s,respectively.The minimum detection concentration of formaldehyde is 100 ppb,with the sensitivity of 2.5.3.The optimum working temperature of the ruptured porous Sm-doped In2O3 nanotubes is 240?.The sensitivity of sensor to 100 ppm of formaldehyde is 66.82,the average response and recovery times are 10 and 34 s respectively.4.For porous Nd-doped In2O3 nanotubes,the optimum operating temperature is 240?.The sensitivity of sensor to 100 ppm of formaldehyde is 44.6,the response and recovery times are 15 and 50 s,the minimum detection concentration of formaldehyde is 100 ppb,the sensitivity is 2.2.For ruptured porous Nd-doped In2O3 nanotubes,the optimum working temperature is 240 ?,the sensitivity of sensor to 100 ppm of formaldehyde is 46.8,the average response and recovery times are 8 and 22 s respectively,and the lowest detection limit is100 ppb with the sensitivity of 2.4.5.The optimum operating temperature of flower-like Zn O is 280?.The sensitivity of sensor to 50 ppm of acetone is 97.8.The response and recovery times are 2 s and 23 s,respectively.
Keywords/Search Tags:Electrospinning, In2O3, La, nanomaterials, gas sensor, gas sensing property
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