alexa Preparation and Photocatalytic Behavior of MoS2 and WS2Nanocluster Sensitized TiO2.
Materials Science

Materials Science

Research & Reviews: Journal of Material Sciences

Author(s): Wingkei Ho, Jimmy C Yu, Jun Lin, Jiaguo Yu, Puishan Li

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A new approach has been developed for the fabrication of visible light photocatalysts. Nanoclusters of MoS2 and WS2 are coupled to TiO2 by an in situ photoreduction deposition method taking advantage of the reducing power of the photogenerated electrons from TiO2 particles. The photocatalytic degradation of methylene blue and 4-chlorophenol in aqueous suspension has been employed to evaluate the visible light photocatalytic activity of the powders. The blue shift in the absorption onset confirms the size quantization of MS2 nanoclusters, which act as effective and stable sensitizers, making it possible to utilize visible light in photocatalysis. Quantum size effects alter the energy levels of the conduction and valence band edges in the coupled semiconductor systems, which favors the interparticle electron transfer. In addition, the coupled systems are believed to act in a cooperative manner by increasing the degree of charge carrier separation, which effectively reduces recombination.

This article was published in Langmuir and referenced in Research & Reviews: Journal of Material Sciences

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