Iodine-mediated etching of triangular gold nanoplates for colorimetric sensing of copper ion and aptasensing of chloramphenicol

Chia Chen Chang, Guoqing Wang, Tohru Takarada, Mizuo Maeda

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26 Citations (Scopus)


A colorimetric method for fast, simple, and selective detection of Cu2+ was developed using I-mediated etching of triangular gold nanoplates (AuNPLs). The method was based on our finding that Cu2+ efficiently promoted this etching in the presence of SCN-. The etching process was accompanied by a dramatic color change from blue to red, allowing for visual and spectroscopic detection of Cu2+ with detection limits of 10 and 1 μM, respectively. When molecular recognition by a DNA aptamer was incorporated into this method, visual detection of chloramphenicol was also achieved with a detection limit of 5 μM.

Original languageEnglish
Pages (from-to)34518-34525
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number39
Publication statusPublished - Jan 1 2017


All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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