Authors: R.K. Sharma, G.B. Reddy
Affilation: Indian Institute of Technology, Delhi, India
Pages: 745 - 748
Keywords: molybdenum oxide, sublimation process, nanostructure
Single crystalline, vertically aligned nanoplates of molybdenum trioxide (MoO3) were grown on the cobalt coated glass substrates by a simple sublimation process in the presence of oxygen plasma. Many research groups have reported the synthesis of various nanostructures of MoO3 films but the height to thickness aspect ratio of 15:1. Films have been deposited keeping the source temperature at 200, 400 and 500°C. SEM micrographs reveal formation of well aligned nanoplates taken place when the source temperature is >400°C. Nanoplates with the maximum aspect ratio are obtained when the source temperature is 500°C. As the source geometry changes from flat to circular few plates (keep the source temperature at 500°C) fused together resulting formation of multipod like structures and the plate edges became sharper. XRD diffractograms and SAED pattern confirm crystal structure to be orthorhombic with preferred orientation along with (110). FTIR studies were carried out in the spectral range from 400 cm-1 to 2000 cm-1. Measured absorption peaks positioned at 1347, 1268, 998, 913, 815, 761 and 445 cm-1, which have attributed to different modes of vibrations, from which formation of molybdenum oxide nanoplates is confirmed.
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