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Bandgap engineering and enhanced interface coupling of graphene–BiFeO₃ nanocomposites as efficient photocatalysts under visible light

Author:
Li, Zhuoxuan, Shen, Yang, Guan, Yuhan, Hu, Yuhan, Lin, Yuanhua, Nan, Ce-Wen
Source:
Journal of materials chemistry A 2014 v.2 no.6 pp. 1967-1973
ISSN:
2050-7496
Subject:
X-ray photoelectron spectroscopy, chemical bonding, engineering, graphene, hot water treatment, irradiation, nanocomposites, nanoparticles, oxides, photocatalysis, photocatalysts, semiconductors
Abstract:
Graphene–BiFeO₃ composites are synthesized through a one-pot hydrothermal method and their photocatalytic performances are investigated under visible light irradiation. Bandgap engineering of BiFeO₃–graphene composites is achieved by simply adjusting the concentration of OH groups during the hydrothermal treatment. XPS and Raman analysis indicate that enhanced coupling between BiFeO₃ nanoparticles and graphene is achieved by the formation of Fe–O–C bonds, which is mediated by OH groups adsorbed on the surface of graphene. The band gaps of the composites could be successfully tuned from 1.78 eV–2.24 eV, giving rise to high photocatalytic performance under visible light irradiation. This may be of significance in understanding the mechanism of the coupling between graphene and semiconductor oxides which are currently being intensively investigated as photocatalysts.
Agid:
6705836