The role of Rh dispersion in gas sensing effects observed in SnO2 thin films

被引：12
|
作者：
Korotcenkov, G. [1 ]
Nehasil, V [2 ]
机构：
[1] Moldova State Univ, Dept Phys & Engn, Str Mateevici 60, Kishinev 2009, MD, Moldova
[2] Charles Univ Prague, Dept Surface & Plasma Sci, Prague, Czech Republic
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2019年 / 232卷
关键词：
Gas sensor; Spray pyrolysis; Conductivity response; Characterization; Optimization; Surface functionalization; Clustering; SPRAY-PYROLYSIS; ISOTOPIC EXCHANGE; METAL-OXIDES; IN-SITU; SENSORS; CO; PD; SELECTIVITY; OXIDATION; RHODIUM;
D O I：
10.1016/j.matchemphys.2019.04.069
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work the effect of surface modification by rhodium on the conductivity response of the SnO2 films to reducing gases such as CO and H-2 and oxidizing gas ozone was analyzed. SnO2 films, subjected to surface modification, were deposited by spray pyrolysis, while Rh was deposited using a micro electron beam evaporation. The thickness of the Rh coating varied in the range of 0-0.1 ML. It was found that there is an optimal thickness of Rh, which gives an improvement in the sensor response and a decrease in the recovery time. An explanation of the observed effects was proposed. It was assumed that the atomically dispersed state of rhodium is most active in gas-sensing effects. The transformation from the atomic state to the cluster state reduces the efficiency of the surface functionalization of SnO2 with rhodium.
引用
收藏
页码：160 / 168
页数：9
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