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Template and Silica Interlayer Tailorable Synthesis of Spindle-like Multilayer α-Fe2O3/Ag/SnO2 Ternary Hybrid Architectures and Their Enhanced Photocatalytic Activity
- Sun, Lingling, Wu, Wei, Yang, Shuanglei, Zhou, Juan, Hong, Mengqing, Xiao, Xiangheng, Ren, Feng, Jiang, Changzhong
- ACS applied materials 2014 v.6 no.2 pp. 1113-1124
- analytical methods, ferric oxide, nanocomposites, nanosilver, photocatalysis, seeds, semiconductors, silica, silver, tin dioxide
- Our study reports a novel iron oxide/noble metal/semiconductor ternary multilayer hybrid structure that was synthesized through template synthesis and layer-by-layer deposition. Three different morphologies of α-Fe₂O₃/Ag/SiO₂/SnO₂ hybrid architectures were obtained with different thicknesses of the SiO₂ interlayer which was introduced for tailoring and controlling the coupling of noble metal Ag nanoparticles (NPs) with the SnO₂ semiconductor. The resulting samples were characterized in terms of morphology, composition, and optical property by various analytical techniques. The as-obtained α-Fe₂O₃/Ag/SiO₂/SnO₂ nanocomposites exhibit enhanced visible light or UV photocatalytic abilities, remarkably superior to commercial pure SnO₂ products, bare α-Fe₂O₃ seeds, and α-Fe₂O₃/SnO₂ nanocomposites. Moreover, the sample of α-Fe₂O₃/Ag/SiO₂/SnO₂ also exhibits good chemical stability and recyclability because it has higher photocatalytic activity even after eight cycles. The origin of enhanced photocatalytic activity on the multilayer core–shell α-Fe₂O₃/Ag/SiO₂/SnO₂ nanocomposites was primarily ascribed to the coupling between noble metal Ag and the two semiconductors Fe₂O₃ and SnO₂, which are proven to be applied in recyclable photocatalysis.