Colorimetric detection toward halide ions by a silver nanocluster hydrogel

Yun Ma; Xiao-Fang Shen; Fei Liu; Yue-Hong Pang

doi:10.1016/j.talanta.2020.120717

Colorimetric detection toward halide ions by a silver nanocluster hydrogel

Talanta. 2020 May 1:211:120717. doi: 10.1016/j.talanta.2020.120717. Epub 2020 Jan 7.

Authors

Yun Ma¹, Xiao-Fang Shen¹, Fei Liu¹, Yue-Hong Pang²

Affiliations

¹ State Key Laboratory for Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China.
² State Key Laboratory for Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China. Electronic address: yhpang@jiangnan.edu.cn.

PMID: 32070619
DOI: 10.1016/j.talanta.2020.120717

Abstract

We reported a novel colorimetric method for highly selective halide ions (Cl^-, Br^-and I^-) recognition by Ag nanoclusters hydrogel (Ag-NCs hydrogel). The Ag-NCs hydrogel could discriminate Cl^-, Br^-and I^- ions from a wide range of environmentally important anions, identified by the distinct UV-vis absorption band changes or the change in the color of Ag-NCs hydrogel. On the basis of this strategy, 20 μM and 200 μM of Cl^-, 5 μM and 100 μM of Br^-, 5 μM and 100 μM of I^- could be recognized within 5 min by UV-vis spectrum and naked eye observation, respectively. The surface color of hydrogel changed from yellow to dark green for Cl^-, to brown for Br^-, and to deep brown for I^-. In addition, this sensing method had been applied successfully to detect chloride anion in real water samples such as tap water, pond water and pure water. Therefore, this rapid, facile, and cost-effective colorimetric assay based on Ag-NCs hydrogel was attractive and promising.

Keywords: Ag nanoclusters hydrogel; Colorimetric sensor; Halides; Real water samples.