Selective Sensors of Nitrogen Dioxide Based on Thin Tungsten Oxide Films under Optical Irradiation

被引：8
|
作者：
Almaev, A., V [1 ]
Yakovlev, N. N. [1 ]
Chernikov, E., V [1 ]
Tolbanov, O. P. [1 ]
机构：
[1] Tomsk State Univ, Tomsk 634050, Russia
来源：
TECHNICAL PHYSICS LETTERS | 2019年 / 45卷 / 10期
关键词：
nitrogen dioxide; tungsten trioxide; thin films; magnetron sputtering; optical radiation; LIGHT; CDSE; SNO2; NO2; ZNO;
D O I：
10.1134/S1063785019100171
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
It is shown that NO2 present in air, beginning at a concentration of 1 ppm, can be selectively detected by sensors based on Au/WO3:Au thin films activated by laser diode radiation with maximum intensity at 400 nm instead of constant heating. The radiation-activated photodesorption reduces the time of sensor response to NO2. A high humidity of air under conditions of room-temperature irradiation additionally increases the device sensitivity to NO2 due to the appearance of additional adsorption sites. The absence of a sensor response to reducing gases and varying oxygen concentration in the atmosphere is caused by the photodesorption of chemisorbed O-2(-) species during their interaction with holes generated in intrinsic optical transitions in the near-surface region of WO3 film.
引用
收藏
页码：1016 / 1019
页数：4
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