Simple electrochemical synthesis of an Au-Ag-Cu trimetallic nanodendrite and its use as a SERS substrate
- Authors
- Chang, Kyeol; Chung, Hoeil
- Issue Date
- 2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.6, no.79, pp.75943 - 75950
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC ADVANCES
- Volume
- 6
- Number
- 79
- Start Page
- 75943
- End Page
- 75950
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155494
- DOI
- 10.1039/c6ra01670g
- ISSN
- 2046-2069
- Abstract
- An Au-Ag-Cu trimetallic nanodendrite was constructed by simple electrochemical methods and was evaluated as a surface enhanced Raman scattering (SERS) substrate. The motivation was to harmonize the individual merits of each SERS-active metal, the higher SERS efficiency of Ag, good surface stability of Au, and structural stability of Cu, in a single structure. For the fabrication, a Cu flower-like nanostructure was initially constructed by reduction of Cu2+ (electrodeposition). Next, a galvanic replacement reaction (GRR) was performed on the Cu framework in a solution of Ag+ to build Ag nanodendrites with coincidental release of Cu atoms into the solution as Cu2+. As the Ag nanodendrite grew, released Cu2+ redeposited, so a Ag-Cu bimetallic nanodendrite started to form. Next, a second GRR was performed with the newly prepared Ag-Cu nanodendrite in Au3+ solution to partially replace Ag and Cu by Au to construct the Au-Ag-Cu trimetallic nanodendrite. Based on examination of Raman peaks of rhodamine 6G (R6G, a reporter molecule), the Ag-Cu nanodendrite resulted in approximately 2.6 fold higher peak intensity compared to a Ag nanodendrite. Subsequent Au incorporation into the Ag-Cu nanodendrite greatly improved the stability of SERS measurements as well as increased the peak intensity further by 7.6 fold, thereby enabling the observation of Raman peaks of a 10(-10) M R6G sample.
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