A multifunctional Ag/TiO2/reduced graphene oxide with optimal surface-enhanced Raman scattering and photocatalysis |
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| Authors: | Yanfen Wang Miao Zhang Lulu Fang Haocheng Yang Yong Zuo Juan Gao Gang He Zhaoqi Sun |
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| Affiliation: | 1. School of Physics & Materials Science, Anhui University, Hefei, China;2. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, China |
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| Abstract: | A multifunctional Ag/TiO2/reduced graphene oxide (rGO) ternary nanocomposite was prepared by a one-step photochemical reaction with TiO2 and Ag nanoparticles successively deposited on reduced graphene oxide. The structure, morphology, composition, optical, and photoelectrochemical properties of Ag/TiO2/rGO were investigated in detail. Meanwhile, the ternary nanocomposite possessed much higher adsorption capacity to organic dyes compared with bare TiO2 and binary Ag/TiO2, which would help to its use for surface-enhanced Raman scattering detection and photocatalytic degradation. Due to the charge transfer between rGO and organic dyes and enhanced electromagnetic mechanism of Ag, Ag/TiO2/rGO nanocomposites as surface-enhanced Raman scattering substrates demonstrated dramatically improved sensitivity and good uniformity. The detection limit of rhodamine 6G (R6G) was as low as 10?9 mol/L, and the relative standard deviation values of the intensities remained below 5%. Most importantly, the synergistic coupling effect of three components extended the photoresponse range and accelerated separation of the electron-hole pairs, leading to greatly improved photocatalytic activity under simulated sunlight. The maximum rate constant (k, 0.06243 min?1) of Ag/TiO2/rGO was 50 and four times higher than that of TiO2 and Ag/TiO2, respectively. |
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| Keywords: | adsorption graphene oxide photocatalysis surface-enhanced Raman scattering property titanium oxide |
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