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Galvanic Synthesis of Three-Dimensional and Hollow Metallic Nanostructures

Galvanic Synthesis of Three-Dimensional and Hollow Metallic Nanostructures

Sun Hwa Park, Jin Gyeong Son, Tae Geol Lee, Jongwon Kim, Sang Yun Han, Hyun Min Park, Jae Yong Song

Nanoscale Res Lett. 2014 Dec;9(1):2403.

PMID: 26088979

Abstract:

We report a low-cost, facile, and template-free electrochemical method of synthesizing three-dimensional (3D) hollow metallic nanostructures. The 3D nanoporous gold (3D-NPG) nanostructures were synthesized by a galvanic replacement reaction (GRR) using the different reduction potentials of silver and gold; hemispherical silver nanoislands were electrochemically deposited on cathodic substrates by a reverse-pulse potentiodynamic method without templates and then nanoporous gold layer replicated the shape of silver islands during the GRR process in an ultra-dilute electrolyte of gold(III) chloride trihydrate. Finally, the wet etching process of remaining silver resulted in the formation of 3D-NPG. During the GRR process, the application of bias voltage to the cathode decreased the porosity of 3D-NPG in the voltage range of 0.2 to -0.62 V. And the GRR process of silver nanoislands was also applicable to fabrication of the 3D hollow nanostructures of platinum and palladium. The 3D-NPG nanostructures were found to effectively enhance the SERS sensitivity of rhodamine 6G (R6G) molecules with a concentration up to 10(-8) M.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP16961254	Gold(III) chloride trihydrate		16961-25-4	Price

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