Web Release Date: September 15,
Simple Approaches to Quality Large-Scale Tungsten Oxide Nanoneedles
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K., School of Mechanical, Materials, Manufacturing Engineering & Management, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., Princeton Materials Institute, Princeton, New Jersey 08540, and Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
Received: March 31, 2004
In Final Form: August 9, 2004
Abstract:
In this paper, a systematic study of large-scale production of highly crystalline W18O49 nanoneedles with
high aspect ratios using a simple tungsten metal reacting with water at 800-1000 
C has been described. By
altering the W source and other experimental conditions, we have generated W18O49 crystals with diverse
morphologies, and needles with desired dimensions are achieved. The quality nanoneedles provide ideal samples
for further property investigations. Possible growth mechanisms are discussed.
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