Galvanic synthesis of three-dimensional and hollow metallic nanostructures
- Authors
- Park, Sun Hwa; Son, Jin Gyeong; Lee, Tae Geol; Kim, Jongwon; Han, Sang Yun; Park, Hyun Min; Song, Jae Yong
- Issue Date
- 16-Dec-2014
- Publisher
- SPRINGEROPEN
- Keywords
- Nanoporous; Gold; Platinum; Palladium; Galvanic reaction
- Citation
- NANOSCALE RESEARCH LETTERS, v.9
- Journal Title
- NANOSCALE RESEARCH LETTERS
- Volume
- 9
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/12018
- DOI
- 10.1186/1556-276X-9-679
- ISSN
- 1931-7573
- 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.
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