Chiang Mai Journal of Science

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Molybdenum oxide (MoO₃) is a wide bandgap semiconductor which can be used as a gas sensor. In this work, molybdenum oxide nanowhiskers were prepared by vapor transport method. First, molybdenum oxide powder were mixed with tin oxide (SnO₂) powder of the ratio of 0%, 20%, 50%, 80% and 100 % by weight. The mixed powder was grounded and pressed into the form of cylindrical tube. Then, the tube was sintered in air at 550oC for 6 h. From Field Emission Scanning Electron Microscopy (FE-SEM) results, nanowhiskers of molybdenum oxide were observed both inside and outside the tube for 50% SnO₂ mixed sample. A typical nanowhisker size is about 100-–300 nm wide, 5–20 µ m long and 80-150 nm thick. For 20% and 80% SnO₂ mixed sample, nanowhiskers were observed only inside the tube but none of nanowhiskers were observed for pure MoO and pure SnO₂ sample.

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