Highly Sensitive and Selective Photoluminescence Detection of Copper Ions via In Situ Formation of Fluorescent Polydopamine
- Authors
- Zhao, Fei; Kim, Jongsung
- Issue Date
- Aug-2017
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Copper Ion Detection; Photoluminescence; Polydopamine
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.17, no.8, pp.5776 - 5779
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 17
- Number
- 8
- Start Page
- 5776
- End Page
- 5779
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/5863
- DOI
- 10.1166/jnn.2017.14158
- ISSN
- 1533-4880
- Abstract
- Detection of heavy metals via fluorescence has attracted increasing attention. Herein, we report a novel copper(II) ion (Cu2+) sensor using fluorescent polydopamine (FPDA). Dopamine is easily oxidized to polydopamine by oxygen in alkaline solution, and oxidized polydopamine does not fluoresce. However, under a nitrogen atmosphere, FPDA can be produced by adding hydrogen peroxide into a dopamine solution in the presence of Cu2+ ions. The fluorescence intensity of FPDA is strongly dependent on the concentration of Cu2+ ions. At higher concentrations of Cu2+ ions, the photoluminescence intensity of FPDA also increases at a higher rate. FPDA exhibited a highly sensitive and selective response to Cu2+ ions over other ionic competitors in the biological milieu, achieving a detection limit as low as 1 nmol L-1 (nM). This study shows that the method can be used for monitoring in vivo Cu2+ ions owing to the distinct properties of FPDA such as strong fluorescence signal and biocompatibility.
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