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Preparation of Porous Chromium Oxide Nanotubes Using Carbon Nanotubes as Templates and Their Application as an Ethanol Sensor

Preparation of Porous Chromium Oxide Nanotubes Using Carbon Nanotubes as Templates and Their Application as an Ethanol Sensor

Guimin An, Yang Zhang, Zhimin Liu, Zhenjiang Miao, Buxing Han, Shiding Miao, Jianping Li

Nanotechnology. 2008 Jan 23;19(3):035504.

PMID: 21817572

Abstract:

Chromium 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 NH(4)HCO(3). 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 Cr(2)O(3)·xH(2)O. The thickness of the Cr(2)O(3)·xH(2)O 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-Cr(2)O(3) nanotubes. The as-prepared α-Cr(2)O(3) sample was used as a sensor material to detect ethanol vapor, and it was demonstrated that the α-Cr(2)O(3) nanotubes exhibited good performance even at 400 °C.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7789028	Chromium(III) nitrate nonahydrate		7789-02-8	Price

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