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Multi-Walled Carbon Nanotube-Doped Tungsten Oxide Thin Films for Hydrogen Gas Sensing
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Document Title
Multi-Walled Carbon Nanotube-Doped Tungsten Oxide Thin Films for Hydrogen Gas Sensing
Author
Wongchoosuk C, Wisitsoraat A, Phokharatkul D, Tuantranont A, Kerdcharoen T
Name from Authors Collection
Scopus Author ID
8532633300
Affiliations
Mahidol University; Mahidol University; National Science & Technology Development Agency - Thailand; National Electronics & Computer Technology Center (NECTEC); Mahidol University; National Science & Technology Development Agency - Thailand; National Nanotechnology Center (NANOTEC)
Type
Article
Source Title
SENSORS
ISSN
1424-8220
Year
2010
Volume
10
Issue
8
Page
7705-7715
Open Access
Green Published, Green Submitted, gold
Publisher
MDPI AG
DOI
10.3390/s100807705
Format
Abstract
In this work we have fabricated hydrogen gas sensors based on undoped and 1 wt% multi-walled carbon nanotube (MWCNT)-doped tungsten oxide (WO3) thin films by means of the powder mixing and electron beam (E-beam) evaporation technique. Hydrogen sensing properties of the thin films have been investigated at different operating temperatures and gas concentrations ranging from 100 ppm to 50,000 ppm. The results indicate that the MWCNT-doped WO3 thin film exhibits high sensitivity and selectivity to hydrogen. Thus, MWCNT doping based on E-beam co-evaporation was shown to be an effective means of preparing hydrogen gas sensors with enhanced sensing and reduced operating temperatures. Creation of nanochannels and formation of p-n heterojunctions were proposed as the sensing mechanism underlying the enhanced hydrogen sensitivity of this hybridized gas sensor. To our best knowledge, this is the first report on a MWCNT-doped WO3 hydrogen sensor prepared by the E-beam method.
Keyword
Carbon nanotube | E-beam evaporation | hydrogen sensor | nanochannels | WO3
Funding Sponsor
Mahidol University; National Science and Technology Agency; Commission on Higher Education; Thailand Research Fund [BRG5180023]
License
CC-BY
Rights
Authors
Publication Source
WOS