Novel surfactant-free multi-branched gold stars characterized by inverse photocurrent

Kang Yeol Lee, Minsik Kim, Jin Seo Noh, Hee Cheul Choi, Wooyoung Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)13890-13895
Number of pages6
JournalJournal of Materials Chemistry A
Issue number44
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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