Near-Infrared Light Manipulated Chemoselective Reductions Enabled by an Upconversional Supersandwich Nanostructure

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• 作者：Zi-en Liu ; Jie Wang ; Yan Li ; Xiaoxia Hu ; Junwen Yin ; Yeqing Peng ; Zhihao Li ; Yawen Li ; Baomin Li ; Quan Yuan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：7
• 期：34
• 页码：19416-19423
• 全文大小：435K
• ISSN：1944-8252

文摘

Core鈥搒atellite is one of the most powerful superstructures since it leads to enhanced or completely new properties through compatible combination of each component. Here we create a novel ceria-based core鈥搒hell鈥搒atellite supersandwich structure with near-infrared (NIR) light manipulated catalytic activity by integrating the upconversion luminescent and catalytic functionality of CeO₂ nanoparticles. Specifically, lanthanide-doped octahedral CeO₂ nanoparticles (o-CeO₂) are coated with silica layer (o-CeO₂@SiO₂) to enhance their luminescence intensity. The pH-dependent catalytic active cubic CeO₂ nanoparticles (c-CeO₂) are then assembled on the surface of o-CeO₂@SiO₂ to form the supersandwich structure (o-CeO₂@SiO₂@c-CeO₂) following a classic chemical reaction. The upconversion quantum yield of o-CeO₂ in this nanostructure can be nearly doubled. Furthermore, under NIR light irradiation, the o-CeO₂@SiO₂@c-CeO₂ supersandwich structure based composite catalyst displays superior catalytic activity in selective reduction of aromatic nitro compounds to corresponding azo compounds, and the composite photocatalyst can be easily recycled for several times without significant loss of catalytic activity. This strategy may serve as a universal method for the construction of multifunctional nanostructures and shed light on the green chemistry for chemical synthesis.