Title

Large scale synthesis and gas sensing application of vertically aligned and double sided tungsten oxide nanorod arrays

RIS ID

31527

Publication Details

Shen, X., Wang, G. and Wexler, D. (2009). Large scale synthesis and gas sensing application of vertically aligned and double sided tungsten oxide nanorod arrays. Sensors and Actuators B: Chemical: international journal devoted to research and development of physical and chemical transducers, 143 (1), 325-332.

Abstract

Large-scale vertically aligned and double-sided Co-doped hexagonal tungsten oxide nanorod arrays have been successfully synthesized by a facile hydrothermal method without using any template, catalyst, or substrate. Scanning electron microscopy and transmission electron microscopy analyses reveal an interesting three-order hierarchical nanostructure from small, single-crystalline nanorods via nanorod bundles to double-sided nanorod arrays. The optical absorption properties of the Co-doped WO3 samples were investigated by ultraviolet–visible spectroscopy, and the results indicate that the Co-doped WO3 nanostructures are semiconducting with direct band gaps of 2.26 eV and 2.77 eV. The gas sensing performance of the as-prepared Co-doped WO3 double-sided nanorod arrays was tested towards a series of typical organic solvents and fuels. The sample shows excellent gas sensing performance towards 1-butanol vapor, with rapid response and high sensitivity. We propose that the double-sided nanorod arrays are formed from urchin-like microspheres via a self-assembly and fusion process. This new synthesis strategy could be extended to prepare other well-aligned nanorod arrays for many functional applications.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.snb.2009.09.015