Pt-Decorated ZnO Nanorods for Light-Assisted Ethanol Sensing and In Situ Analysis of the Sensing Mechanism under Light Irradiation

被引:0
|
作者
Inomata, Yusuke [1 ]
Koga, Kanako [2 ]
Shinkai, Takeshi [2 ]
Kida, Tetsuya [1 ,3 ,4 ]
机构
[1] Kumamoto Univ, Fac Adv Sci & Technol, Kumamoto 8608555, Japan
[2] Kumamoto Univ, Grad Sch Sci & Technol, Dept Appl Chem & Biochem, Kumamoto 8608555, Japan
[3] Kumamoto Univ, Inst Ind Nanomat IINa, Kumamoto 8608555, Japan
[4] Kumamoto Univ, Int Res Org Adv Sci & Technol IROAST, Kumamoto 8608555, Japan
基金
日本学术振兴会;
关键词
semiconductor gas sensors; ZnO nanorods; lightirradiation; ethanol; in situ spectroscopy; ALCOHOL OXIDATION; GAS SENSORS; ZINC-OXIDE; SNO2; TEMPERATURE; CRYSTAL; AU;
D O I
10.1021/acsami.4c05044
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
ZnO nanorods have attracted much attention owing to their outstanding properties for chemical gas sensors. Although they show greater sensing properties than conventional nanoparticulate ZnO, high operation temperature (>250-350 degrees C) is required for them to work even if precious metals are deposited on them to sensitize their sensing properties. Light irradiation is one solution for overcoming the high operation temperature and the gas selectivity because it assists the oxidation activity on the surface that affects the sensor response. In this work, the sensing properties of Pt/ZnO nanorods and ZnO nanorods are examined under light irradiation, and the relationship between their sensing properties and surface reaction (ethanol oxidation) is elucidated. Pt/ZnO nanorods show selective sensor responses to ethanol (conditions: 150 degrees C, 50 ppm ethanol; sensor response, 843; response time, 4.0 min; recovery time, 22 min). In situ spectroscopic observations reveal that the largest amount of oxidation intermediates (acetate species) and oxidation products (CO2 and acetaldehyde) is confirmed during light irradiation. The oxidation reaction of ethanol is facilitated by the deposition of Pt and light irradiation. Thus, the operation temperature of ZnO nanorods decreases, and the selectivity to ethanol is enhanced.
引用
收藏
页码:1399 / 1407
页数:9
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