期刊
CARBON
卷 89, 期 -, 页码 130-141出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.03.037
关键词
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资金
- National Natural Science Foundation of China [51432006, 50925207, 51172100]
- Ministry of Science and Technology of China for the International Science Linkages Program [2009DFA50620, 2011DFG52970]
- Ministry of Education of China for the Changjiang Innovation Research Team [IRT14R23]
- Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project [B13025]
- Jiangsu Innovation Research Team
- Australian Research Council
TiO2/recluced graphene oxide (RGO) nanocomposites Gx (RGO titania nanocomposite, x grams tetrabutyl titanate per 0.03 g RGO, x = 0.25, 0.50, 1.00) were prepared by a hydrothermal method: graphene oxide was reduced to RGO in a 2:1 water:ethanol mixture in the presence of varying quantities of tetrabutyl titanate, which deposited as TiO2 on the RGO sheets. The nanocomposites were characterized by a combination of Fourier transform infrared spectroscopy, diffuse reflectance ultraviolet-visible spectroscopy, photoluminescence spectroscopy, Raman spectroscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy studies. The nanocomposite G0.25 exhibits enhanced nonlinear optical properties compared to its individual components, which is ascribed to a combination of mechanisms. The role of defects and electron/energy transfer in the optical limiting performance of G0.25 was clarified with the help of Raman and photoluminescence spectroscopies. Intensity-dependent switching between reverse saturable absorption and saturable absorption behavior was observed with the G0.50 nanocomposite. (C) 2015 Elsevier Ltd. All rights reserved.
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