Nanotechnology · 2013 · 41 citations · 34 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials ChemistryNanomaterialsNanotechnologyMetal Oxide NanomaterialsMicrowave-assisted SynthesisNanocatalysisNanomaterials SynthesisPhotocatalysisX-ray Photoelectron SpectroscopyMicrowave-assisted Materials SynthesisMicrowave-assisted Nanomaterial SynthesisOptical Band GapPhotocatalytic DegradationPhotocatalytic MaterialsPhotocatalytic NanomaterialsPhotocatalytic TreatmentX-ray Diffraction Analysis
A novel ambient pressure microwave assisted technique is developed in which silver and indium-modified ZnS is synthesized. The as-prepared ZnS is characterized by x-ray diffraction, UV-vis spectroscopy, x-ray photoelectron spectroscopy and luminescence spectroscopy. This procedure produced crystalline materials with particle sizes below 10 nm. The synthesis technique leads to defects in the crystal which induce mid-energy levels in the band gap and lead to indoor light photocatalytic activity. Increasing the amount of silver causes a phase transition from cubic blende to hexagonal phase ZnS. In a comparative study, when the ZnS cubic blende is heated in a conventional chamber furnace, it is completely converted to ZnO at 600 °C. Both cubic blende and hexagonal ZnS show excellent photocatalytic activity under irradiation from a 60 W light bulb. These ZnS samples also show significantly higher photocatalytic activity than the commercially available TiO(2) (Evonik-Degussa P-25).
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Issei Tsuji, Hideki Kato, Hisayoshi Kobayashi et al. · Journal of the American Chemical Society · 2004 · 823 citations