title: Microwave-assisted synthesis of WS2nanowires through tetrathiotungstate precursors.
abstract: 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 WS2with thickness of about 5-10 nm when heated at 750 °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 WS2powders reveals a red shift of the exciton bands compared to bulk WS2.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
authors.forename: Pravas Kumar
authors.initials: PK
authors.lastname: Panigrahi
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
authors.forename: Amita
authors.initials: A
authors.lastname: Pathak
keywords: microwave heating; monoethanolamine; nanowires; tungsten disulfide