Nano-crystalline Fe2O3 thin films for ppm level detection of H2S

被引：116

作者：

Balouria, Vishal ^{[1
,2
]}

Kumar, Arvind ^{[1
]}

Samanta, S. ^{[1
]}

Singh, A. ^{[1
]}

Debnath, A. K. ^{[1
]}

Mahajan, Aman ^{[2
]}

Bedi, R. K. ^{[2
]}

Aswal, D. K. ^{[1
]}

Gupta, S. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Tech Phys Div, Bombay 400085, Maharashtra, India

[2] Guru Nanak Dev Univ, Dept Phys, Amritsar 143005, Punjab, India

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2013年 / 181卷

关键词：

Fe2O3 thin films; Gas sensing; XPS; Adsorbed oxygen; GAS-SENSING PROPERTIES; P-TYPE; N-TYPE; ELECTRICAL-PROPERTIES; FACILE SYNTHESIS; OXIDE; TRANSITION; CONDUCTIVITY; NANOWIRES; BEHAVIOR;

D O I：

10.1016/j.snb.2013.02.013

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We have investigated the chemiresistive gas sensing characteristics of Fe2O3 thin films for a host of gases (H2S, C2H5OH, CO, NH3, CH4, CO2, NO and Cl-2). Fe2O3 films were prepared by thermal oxidation of Fe films, which were deposited on (0 0 0 1) Al2O3 substrate by electron-beam evaporation method. The results of scanning electron microscopy, atomic force microscopy and X-ray diffraction revealed that the grains of these films are composed of nano-crystallites (size similar to 32 nm). We demonstrate that these Fe2O3 films show purely n-type conductivity, with high selectivity, moderate response and recovery for H2S in the concentration range of 1-50 ppm. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：471 / 478

页数：8

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