Zhong H X, Wei Y, Yue Y Z, Zhang L H, Liu Y
Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, People's Republic of China.
Nanotechnology. 2016 Apr 1;27(13):135701. doi: 10.1088/0957-4484/27/13/135701. Epub 2016 Feb 19.
The core-shell structure of Ag@CeO2 was prepared by a novel and facile method, which was based on the photothermal effect of localized surface plasmon resonance (LSPR). Nanoparticles (NPs) of Ag were dispersed in a solution containing citric acid, ethylene glycol and cerium nitrate, then under irradiation, Ag NPs generated heat from LSPR and the heat-induced polymerization reaction in the interface between Ag and the sol resulted in cerium gel formation only on the surface of the Ag NPs. After calcination, Ag@CeO2 was successfully obtained, then Ag@CeO2/SiO2 was prepared by loading Ag@CeO2 on SiO2. The resultant catalyst exhibited favorable activity and stability for CO oxidation. The preparation method proposed here should be extendable to other composites with metallic cores and oxide shells in which the metallic nanoparticle possesses LSPR properties.
采用一种基于局域表面等离子体共振（LSPR）光热效应的新颖简便方法制备了Ag@CeO₂核壳结构。将银纳米颗粒（NPs）分散于含有柠檬酸、乙二醇和硝酸铈的溶液中，然后在光照下，Ag NPs通过LSPR产热，且Ag与溶胶界面处的热引发聚合反应仅导致在Ag NPs表面形成铈凝胶。煅烧后成功获得Ag@CeO₂，随后通过将Ag@CeO₂负载在SiO₂上制备了Ag@CeO₂/SiO₂。所得催化剂对CO氧化表现出良好的活性和稳定性。本文提出的制备方法应可扩展至其他具有金属核和氧化物壳且金属纳米颗粒具有LSPR性质的复合材料。
