Superstructure of Au and Ag nanoparticles for the photothermal-mediated catalytic reaction
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초록
내용
Much effort has been devoted to the synthesis of heterogeneous nanoparticles composed of different metal nanoparticles, i.e., gold and silver nanoparticle. The interest of heterogeneous nanoparticles resides on the fact that these structure exhibit different properties with respect to the single nanoparticles, leading to their tremendous applications in many fields such as biomedical, catalysis, photothermal therapy, and tissue imaging. In this regard, we present a straightforward approach to prepare heterogeneous nanoparticle assemblies by utilizing the mussel-inspired polydopamine (PDA). Firstly, we coated the surface of Au NPs with a PDA shell layer in the alkaline condition. Here, PDA layer is the active sites for the in-situ reduction of Ag NPs on the surface of PDA-modified Au NP. Furthermore, we evaluated the photocatalytic performance of the final assemblies for the conversion of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride.