Hybrid PdAg alloy-Au nanorods： Controlled growth, optical properties and electrochemical catalysis

Controllable growth of high-quality hybrid nanostructures is highly desirable for the fabrication of hierarchical, complex and multifunctional devices. Here, PdAg alloys have been controllably grown at different locations on gold nanorods, producing dumbbell-like nanostructures with PdAg at the ends...

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Bibliographic Details
Published in:Nano research 2013-08, Vol.6 (8), p.571-580
Main Authors: Zhang, Qiao, Guo, Xia, Liang, Zhenxing, Zeng, Jianhuang, Yang, Jian, Liao, Shijun
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Alloys
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Branched
Catalysis
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Electron microscopes
Ethanol
Ethyl alcohol
Fabrication
Gold
Materials Science
Nanocomposites
Nanomaterials
Nanorods
Nanostructure
Nanotechnology
Optical properties
Oxidation
Physical properties
Research Article
Surfactants
Temperature
Transmission electron microscopy
X-ray spectroscopy
X射线光电子能谱
光学性能
可控生长
合金
混合
溴化十六烷基三甲铵
电化学催化
透射电子显微镜
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Summary:Controllable growth of high-quality hybrid nanostructures is highly desirable for the fabrication of hierarchical, complex and multifunctional devices. Here, PdAg alloys have been controllably grown at different locations on gold nanorods, producing dumbbell-like nanostructures with PdAg at the ends of the gold nanorods or branched nanostructures with PdAg grown almost perpendicular to the gold nanorods. The nucleation sites of PdAg alloys on the gold nanorods can be effectively tuned by varying the concentrations of H2PdC14, AgNO3 and cetyltrimethylammonium bromide （CTAB）. The dumbbell-like and branched nanostructures were characterized by transmission electron microscopy （TEM）, high-resolution TEM （HRTEM）, line-scanning energy-dispersive X-ray spectros-copy （EDS）, X-ray photoelectron spectroscopy （XPS） and UV-Vis absorption spectroscopy. Their electrocatalytic performance was evaluated using ethanol oxidation as a probe reaction. The dumbbelMike nanostructures show a better anti-poisoning performance, but a worse electrochemical activity than the branched ones. The results provide guidelines for the controlled growth of complicated nanostructures for either fundamental studies or potential applications.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-013-0332-8