Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 9, Issue 4, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/9/4/045008
Keywords
tungsten disulfide; monoethanolamine; microwave heating; nanowires
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Tungsten disulfide (WS2) nanowires have been synthesized through a microwave-assisted chemical route that uses tungstic acid, elemental sulfur and monoethanolamine as starting reagents for obtaining a precursor solution of tetrathiotungstate ions. Acidification of the precursor solution yields amorphous precipitates, which lead to the formation of nanowires of WS2 with thickness of about 5-10 nm when heated at 750 degrees C under argon atmosphere for 1.5 h. Phase and the microstructure of the prepared powders have been investigated through x-ray powder diffraction and high-resolution transmission electron microscopy, respectively. Optical absorption of the WS2 powders reveals a red shift of the exciton bands compared to bulk WS2.
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