Lateral Etching of Core–Shell Au@Metal Nanorods to Metal-Tipped Au Nanorods with Improved Catalytic Activity

Autor:	Xia Guo, Qiao Zhang, Qing Zhao, Yanghui Sun, Jian Yang
Rok vydání:	2012
Předmět:	Materials science Nanostructure Passivation General Engineering General Physics and Astronomy Nanotechnology Catalysis Metal Chemical engineering Etching (microfabrication) visual_art visual_art.visual_art_medium General Materials Science Nanorod Reactivity (chemistry) Hybrid material
Zdroj:	ACS Nano. 6:1165-1175
ISSN:	1936-086X 1936-0851
Popis:	Selective growth/etching of hybrid materials is very important for the rational synthesis of hierarchical structures and precise modulation of their physical properties. Here, the lateral etching of the core-shell Au@Ag nanorods is achieved by FeCl(3) at room temperature, producing a number of dumbbell-like Ag-tipped Au nanorods. This selective etching at the side of the core-shell nanorods is attributed to the increased reactivity of the side facets, due to less surface passivation of cetyltrimethylammonium bromide. The similar synthetic strategy has also been demonstrated to be successful for the Pd-tipped Au nanorods that have not been reported before, indicating the great potential of this selective etching. The Ag-tipped Au nanorods are examined as a catalyst for the reduction of p-nitrophenol at room temperature. The Ag-tipped Au nanorods exhibit a higher catalytic activity than Au nanorods and core-shell Au@Ag nanorods, which could be attributed to the electronic effect and the unique structure in the Ag-tipped Au nanorods.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c2c60e1fb440d0bfc364cf6807a4810 https://doi.org/10.1021/nn203793k Zobrazit plný text záznamu