Synthesis of Core-Shell Cu-Au Nanoparticles via a Redox-Transmetalation Method in Reverse Microemulsion

Jun Jie Jing; Ji Min Xie; Gao Yuan Chen; Wen Hua Li; Ming Mei Zhang

doi:10.4028/www.scientific.net/AMR.815.465

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Synthesis of Core-Shell Cu-Au Nanoparticles via a Redox-Transmetalation Method in Reverse Microemulsion
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 815Synthesis of Core-Shell Cu-Au Nanoparticles via a...

Synthesis of Core-Shell Cu-Au Nanoparticles via a Redox-Transmetalation Method in Reverse Microemulsion

Abstract:

Core-shell Cu-Au nanoparticles were chemically synthesized through a redox-transmetalation method in reverse microemulsion. The powder X-ray diffraction patterns revealed the presence of crystalline gold and copper and the absence of any copper oxides or other byproducts. The core shell structure could be clearly observed by the transmission electron microscope (TEM). In addition, the Cu cores and the gold shells were further verified by the high-resolution transmission electron microscope (HRTEM). The diameter of the nanoparticles ranged from 15 to 25 nm, with 5-10 nm core diameters and 10-15 nm shell thickness. The UV-visible absorption spectra of these nanoparticles showed a red shift (relative to pure gold nanoparticles), also in agreement with the gold shell morphology.