Guimin An et al 2008 Nanotechnology 19 035504 doi:10.1088/0957-4484/19/03/035504
Preparation of porous chromium oxide nanotubes using carbon nanotubes as templates and their application as an ethanol sensor
Guimin An1, Yang Zhang2, Zhimin Liu1,3, Zhenjiang Miao1, Buxing Han1, Shiding Miao1 and Jianping Li2
Show affiliationsChromium oxide nanotubes were successfully prepared using multi-walled carbon nanotubes (MWCNTs) as a template via a supercritical fluid-mediated route. In this method, with chromium (III) nitrate nonahydrate as precursor, chromium oxide was first deposited on MWCNTs in supercritical ethanol in the presence of NH4HCO3. The as-prepared chromium oxide/MWCNT nanocomposites were characterized by transmission electron microscopy, x-ray diffraction, infrared spectroscopy and thermogravimetric analysis. It was demonstrated that the MWCNTs were coated with a layer of amorphous Cr2O3
xH2O. The thickness of the Cr2O3xH2O sheath on MWCNTs could be tuned by manipulating the ratio of precursor to MWCNTs. Calcining the composites at 550 °C, the MWCNTs were removed, producing polycrystalline α-Cr2O3 nanotubes. The as-prepared α-Cr2O3 sample was used as a sensor material to detect ethanol vapor, and it was demonstrated that the α-Cr2O3 nanotubes exhibited good performance even at 400 °C.
- PACS
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81.16.-c Methods of nanofabrication and processing
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
- Subjects
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Condensed matter: electrical, magnetic and optical
Instrumentation and measurement
- Dates
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Issue 3 (23 January 2008)
Received 11 September 2007, in final form 6 November 2007
Published 13 December 2007
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Preparation of porous chromium oxide nanotubes using carbon nanotubes as templates and their application as an ethanol sensor
Guimin An et al 2008 Nanotechnology 19 035504
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