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Effect of processing parameters on anodic nanoporous tungsten oxide film structure and porosity for hydrogen detection

Published online by Cambridge University Press:  15 January 2014

Taisheng Yang ,
Yue Zhang ,
Yanan Cai  and
Hui Tian
Taisheng Yang
Affiliation:
Key Laboratory of Aerospace Advanced Materials and Performance (Beihang University), Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Yue Zhang*
Affiliation:
Key Laboratory of Aerospace Advanced Materials and Performance (Beihang University), Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Yanan Cai
Affiliation:
Key Laboratory of Aerospace Advanced Materials and Performance (Beihang University), Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China
Hui Tian
Affiliation:
College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: zhangy@buaa.edu.cn
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Abstract

Nanoporous tungsten oxide films were synthesized by an anodic oxidation process in aqueous NaF/HF electrolytes. The tungsten films were deposited by the radio frequency magnetron sputtering method on sapphire substrates, and the anodic oxidation process was conducted in a dual-electrode reaction chamber with graphite electrode. The effects of processing parameters (anodic voltage, time, temperature, and the operation distance) on the morphology and porosity of the synthesized films were investigated experimentally. The samples were characterized by x-ray diffraction and scanning electron microscopy. The results showed that the pore diameter and porosity increased gradually with increasing anodic voltage, whereas the “wall” of the pore was subjected to electric breakdown at 60 V, and the pore diameter and porosity decreased. The pore diameter and porosity showed an early increased and later decreased state as the operation time and distance are increased. The sensitive response in the resistive method is reaction-dominated type and is exhibited as a linear relationship as a function of hydrogen gas concentration. The response toward 500 ppm hydrogen in air is up to 15.1 with a response time of 10 min at 200 °C.

Keywords

anodic oxidationnanoporous filmporositytungsten oxideH2 sensitivity
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 1: Focus Issue: Synthesis of Nanostructured Functional Oxides , 14 January 2014 , pp. 166 - 174
Copyright
Copyright © Materials Research Society 2013 

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