Authors: Kichambare, Padmakar; Hii, King-Fu; Vallance, R. Ryan; Sadanadan, B.; Rao, Apparao M.; Javed, Kazi; Menguc, M. Pinar

Source: Journal of Nanoscience and Nanotechnology, Volume 6, Number 2, February 2006 , pp. 536-540(5)

Publisher: American Scientific Publishers

Abstract:

Hybrid nanostructures consisting of tungsten oxide nanorods with mushroom-shaped carbon caps were grown on electrochemically etched tungsten tips by thermal chemical vapor deposition with methane and argon. These nanorods grow along the radial direction and are very straight and smooth. Electron microscopy revealed a dominant diameter and length of ∼50 nm and ∼0.6 μm, respectively. High-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS) revealed the presence of crystalline monoclinic W₁₈O₄₉ in the nanorods, and the cap was entirely amorphous carbon. A plausible growth mechanism involves the reduction of tungsten oxide WO₃, present on the tungsten surface, by methane at 900 °C.

Keywords: HYBRID NANOSTRUCTURE; TUNGSTEN OXIDE; METHANE; NANOROD; CHEMICAL VAPOR DEPOSITION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2006.095

Publication date: 2006-02-01

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