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A novel hetero-structure sensor based on Au/Mg-doped Tio(2)/SnO2 nanosheets directly grown on Al2O3 ceramic tubes
Xu Hongyan
Ju Dianxing
Chen Zhengrun
Han Rui
Zhai Ting
Yu Huanqin
Liu Caiyun
Wu Xiangwen
Wang Jieqiang
Cao Bingqiang
Sensors and Actuators B: Chemical , 2018, 273: 328-335.
Summary
D Chemiresistive gas sensors with novel nanostructures, high response and reliable fabrication process have been fabricated successfully by designing Au/Mg-doped TiO2/SnO2 nanosheets hetero-structures. Mg doping was used to decrease the work function of TiO2, which can lead to the electrons in TiO2 greatly depleted due to the formation of Schottky contact and n-n heterojunction. SnO2 nanosheets were directly grown on Al2O3 tube with a cost-effective hydrothermal process. By employing pulsed laser deposition (PLD) and direct current sputtering methods, the construction of gold (Au) nanoparticles-loaded Mg-doped TiO2/SnO2 heterostructure is highly controllable and reproducible. In comparison with pristine SnO2 and TiO2/SnO2, Mg-doped TiO2/SnO2 sensors exhibit high response (30.4) and short response time (9 s) to 50 ppm TEA gas, which is about 6 times higher than pure SnO2 sensor and 2 times higher than TiO2/SnO2 sensor at a working temperature of 260 degrees C. The mechanism for sensing property enhancing of the Au/Mg-doped TiO2/SnO2 sensor was also discussed in detail with the semiconductor depletion layer model introduced by Au-TiO2 Schottky contact and TiO2/SnO2 n-n heterojunction.
Keywords
Au/Mg-doped TiO2/SnO(2)nanosheets; Schottky contact; n-n Heterojunction; Gas sensor
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