NDLI: Electron Beam Evaporation of Tungsten Oxide Films for Gas Sensors

Content Provider	IEEE Xplore Digital Library
Author	Tesfamichael, T.
Copyright Year	2001
Abstract	Pure and iron incorporated nanostructured Tungsten Oxide (WO₃) thin films were investigated for gas sensing applications using noise spectroscopy. The WO₃ sensor was able to detect lower concentrations (1-10 ppm) of NH₃, CO, CH₄, and Acetaldehyde gases at operating temperatures between 100°C to 250°C. The iron-doped Tungsten Oxide sensor ( WO₃:Fe) showed some response to Acetaldehyde gas at relatively higher operating temperature (250°C) and gas concentration of 10 ppm. The sensitivity of the WO₃ sensor towards NH₃, CH₄ and Acetaldehyde at lower operating temperatures (50°C-100°C) was significant when the sensor was photo-activated using blue light-emitting diode (Blue-LED). From the results, photo-activated WO₃ thin film that operates at room temperature appeared to be a promising gas sensor. The overall results indicated that the WO₃ sensor exhibited reproducibility for the detection of various gasses and the WO₃:Fe indicated some response towards Acetaldehyde gas.
Sponsorship	IEEE Sensors Council
Starting Page	1796
Ending Page	1802
Page Count	7
File Size	1665479
File Format	PDF
ISSN	1530437X
Volume Number	10
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electron beams Tungsten Gas detectors Temperature sensors Iron Transistors Spectroscopy Gases Light emitting diodes Thin film sensors noise spectroscopy Gas sensor iron doping tungsten oxide nanostructured thin films
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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