Properties of NiO sputtered thin films and modeling of their sensing mechanism under formaldehyde atmospheres

被引：60
作者：
Castro-Hurtado, I. [1 ,2 ]
Malagu, C. [3 ,4 ]
Morandi, S. [5 ,6 ]
Perez, N. [1 ,2 ]
Mandayo, G. G. [1 ,2 ]
Castano, E. [1 ,2 ]
机构：
[1] Univ Navarra, CEIT, San Sebastian 20018, Spain
[2] Univ Navarra, Tecnun, San Sebastian 20018, Spain
[3] Univ Ferrara, Dept Phys, I-44100 Ferrara, Italy
[4] IDASC Ist Acust & Sensorist OM Corbino, Corbino, Italy
[5] Univ Turin, Dipartimento Chim, Ctr Excellence, I-10125 Turin, Italy
[6] Univ Turin, NIS, Ctr Excellence, I-10125 Turin, Italy
来源：
ACTA MATERIALIA | 2013年 / 61卷 / 04期
关键词：
NiO; Surface barrier; Formaldehyde; Gas sensor; p-Type; GAS SENSOR; OPTICAL-PROPERTIES; OXYGEN; OXIDATION; BARRIER;
D O I：
10.1016/j.actamat.2012.10.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work the sensing mechanism of p-type semiconducting NiO thin films under the exposure to formaldehyde is explained. The influence of the sensing layer thickness and annealing treatment on the structural, optical and electrical properties of the samples is studied. The height of the potential barrier is estimated from temperature-stimulated conductance measurements. The potential barrier height is linked to oxygen ionosorption on the semiconductor surface. Furthermore, Fourier transform-IR analysis was carried out in order to determine the chemical reactions that govern the process of gas detection and the temperature range at which they occur. As a result of the study, it is possible to explain how the thickness and annealing treatment affect the sensing mechanism of the samples. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1146 / 1153
页数：8
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