Novel surfactant-free multi-branched gold stars characterized by inverse photocurrent
SCIE
SCOPUS
- Title
- Novel surfactant-free multi-branched gold stars characterized by inverse photocurrent
- Authors
- Lee, KY; Kim, M; Noh, JS; Choi, HC; Lee, W
- Date Issued
- 2013-01
- Publisher
- ROYAL SOC CHEMISTRY
- 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.
- Keywords
- METAL NANOPARTICLE; GALVANIC DISPLACEMENT; PLASMON RESONANCES; NANOSTRUCTURES; NANOCRYSTALS; GAAS; INP; INTERFACE; CHEMISTRY; GERMANIUM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14862
- DOI
- 10.1039/C3TA11983A
- ISSN
- 2050-7488
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, vol. 1, no. 44, page. 13890 - 13895, 2013-01
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