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A multifunctional Ag/TiO 2 /reduced graphene oxide with optimal surface‐enhanced Raman scattering and photocatalysis
Author(s) -
Wang Yanfen,
Zhang Miao,
Fang Lulu,
Yang Haocheng,
Zuo Yong,
Gao Juan,
He Gang,
Sun Zhaoqi
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16273
Subject(s) - photocatalysis , graphene , materials science , rhodamine 6g , oxide , ternary operation , nanocomposite , raman scattering , raman spectroscopy , chemical engineering , adsorption , rhodamine b , nanotechnology , chemistry , optics , fluorescence , catalysis , physics , engineering , computer science , metallurgy , programming language , biochemistry
A multifunctional Ag/TiO 2 /reduced graphene oxide ( rGO ) ternary nanocomposite was prepared by a one‐step photochemical reaction with TiO 2 and Ag nanoparticles successively deposited on reduced graphene oxide. The structure, morphology, composition, optical, and photoelectrochemical properties of Ag/TiO 2 / rGO were investigated in detail. Meanwhile, the ternary nanocomposite possessed much higher adsorption capacity to organic dyes compared with bare TiO 2 and binary Ag/TiO 2 , 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/TiO 2 / 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/TiO 2 / rGO was 50 and four times higher than that of TiO 2 and Ag/TiO 2 , respectively.