Photocatalytic properties of free and oxide-supported MoS₂ and WS₂ nanoparticles synthesized without surfactants
2013
James, Derak | Zubkov, Tykhon
MoS₂ and WS₂ are narrow bandgap semiconductors that become photocatalytically active when dispersed on the nanometer scale. Surfactant-free nanoparticles of MoS₂ and WS₂ were synthesized by thermally decomposing the metal hexacarbonyls in the presence of co-dissolved sulfur. The nanoparticles exhibit a size-dependent shift in their threshold UV–visible absorption. A significant fraction of the nanoparticles is 10–20nm in diameter. Free unsupported MoS₂ and WS₂ nanoparticles catalyzed the photodegradation of acetone in an aqueous solution under visible light of wavelength≥400nm. These nanoparticles did not disperse in the solutions due to hydrophobicity. Water dispersible MoS₂ and WS₂ were prepared by synthesizing them in the presence of high surface silica or titania (anatase) to produce oxide-supported nanoparticles (1wt%). These silica- and titania-supported MoS₂ and WS₂ nanoparticles catalyzed the photodegradation of methylene blue under irradiation of wavelength≥400nm.
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