In this paper, a systematic study of large-scale production of highly crystalline W 18 O 49 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 W 18 O 49 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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Jin et al. (2004) studied this question.
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