期刊
CATALYSIS COMMUNICATIONS
卷 44, 期 -, 页码 62-67出版社
ELSEVIER
DOI: 10.1016/j.catcom.2013.07.030
关键词
CuS; CuS/ZnS core/shell nanocrystals; Hydrothermal synthesis; Photocatalytic activity; Water depollution
资金
- Vietnam Academy of Science and Technology [02/DLT/VAST]
- PCATDES project through the EU-FP7 program [NMP.2012.2.2-6]
- Royal Society
High quality CuS and CuS/ZnS core/shell nanocrystals (NCs) were synthesized in a large quantity using a facile hydrothermal method at low temperatures of 60 degrees C and evaluated in the photodegradation of Rhodamine B (RhB) under visible light irradiation. Synthesis time plays an important role in controlling the morphology, size and photocatalytic activity of both CuS and CuS/ZnS core/shell NCs which evolve from spherical shaped particles to form rods with increasing reaction time, and after 5 h resemble flower shaped morphologies in which each flower is composed of many NCs. Photocatalytic activity originates from photo-generated holes in the narrow bandgap CuS, with encapsulation by large bandgap ZnS layers used to form the core/shell structure that improves the resistance of CuS towards photocorrosion. Such CuS/ZnS core/shell structures exhibit much higher photocatalytic activity than CuS or ZnS NCs alone under visible light illumination, and is attributed to higher charge separation rates for the photo-generated carriers in the core/shell structure. (C) 2013 Elsevier B.V. All rights reserved.
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