Novel surfactant-free multi-branched gold stars characterized by inverse photocurrent
- Authors
- Lee, Kang Yeol; Kim, Minsik; Noh, Jin-Seo; Choi, Hee Cheul; Lee, Wooyoung
- Issue Date
- 2013
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.1, no.44, pp.13890 - 13895
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 1
- Number
- 44
- Start Page
- 13890
- End Page
- 13895
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/15863
- DOI
- 10.1039/c3ta11983a
- ISSN
- 2050-7488
- Abstract
- Multi-branched gold stars were spontaneously formed on a semiconductor (Ge) substrate in high yield via a surfactant-free galvanic displacement method at room temperature using a DMF-water (9/1) mixed solvent. The average length of the branches was estimated to be 561 nm, and the size and shape of the multi-branched gold stars can be controlled by varying the reaction time of the Ge wafer and gold precursor. A high volume ratio of DMF was found to be crucial for the formation of these multi-branched gold stars. Interestingly, the photocurrent of the prepared gold stars decreased by 10% upon irradiation with a 532 nm visible laser. The photocurrent was switched on and off >10 times without significant degradation, indicating high reproducibility and reliability of the inverse photoresponse of the gold stars under visible light.
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Collections - 바이오나노대학 > 나노물리학과 > 1. Journal Articles
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