期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 38, 页码 20381-20386出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm34113a
关键词
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资金
- Key Program Projects of the National Natural Science Foundation of China [21031001]
- National Natural Science Foundation of China [20971040, 91122018, 10979032, 21001042, 21171052]
- Cultivation Fund of the Key Scientific and Technical Innovation Project of Ministry of Education of China [708029]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NCET-11-0959]
- Postdoctoral Science Foundation of Heilongjiang Province [LBH-Q11009]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20112301110002]
NaYF4:Er3+/Yb3+-graphene composites were successfully prepared by growing NaYF4:Er3+/Yb3+ nanoparticles in interlayers of expanded graphite, accompanied with the simultaneous exfoliation of expanded graphite under polyvinylpyrrolidone-assisted hydrothermal conditions. The obtained NaYF4:Er3+/Yb3+-graphene composites can emit bright green upconversion emissions under 980 nm excitation. In addition, the NaYF4:Er3+/Yb3+-graphene composites were chosen to design TiO2-NaYF4:Er3+/Yb3+-graphene composite photoanodes, which have the ability to improve the efficiencies of the solar cells. The electron transport and interfacial recombination kinetics were investigated by the electrochemical impedance spectroscopy and intensity-modulated photocurrent/photovoltage spectroscopy in detail.
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