Trace Cd2+ Ions Detection on the Flower-Like Ag@CuO Substrate

Mingming Cheng; Chenyan Li; Weijun Li; Yingkai Liu

doi:10.3390/nano10091664

Trace Cd²⁺ Ions Detection on the Flower-Like Ag@CuO Substrate

Nanomaterials (Basel). 2020 Aug 25;10(9):1664. doi: 10.3390/nano10091664.

Authors

Mingming Cheng^{1

2}, Chenyan Li^{1

2}, Weijun Li^{1

2}, Yingkai Liu^{1

2}

Affiliations

¹ Yunnan Key Laboratory of Opto-electronic Information Technology, Yunnan Normal University, Kunming 650500, China.
² Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China.

Abstract

CuO flower-like material (FM) was prepared via the facile hydrothermal method, and Ag nanoparticles were deposited on the CuO FM to obtain Ag@CuO composite. Rhodamine 6G (R6G) was used as the probe molecule on Ag@CuO FM substrate to study surface enhanced Raman scattering (SERS). It is discovered that it exhibited an excellent SERS performance with limit of detection of 3.58 × 10^-16 M and enhancement factor (EF) of 3.99 × 10¹⁰. More importantly, we used it as a SERS substrate to detect cadmium ions and found that its limit of detection (LOD) reaches up to 2.6 × 10^-8 M, which is lower than the highest allowable Cd²⁺ concentration in drinking water set by the World Health Organization (WHO) and Environmental Protection Agency (EPA). Therefore, the proposed composite can be applicable to the detection of Cd²⁺ in drinking water and in soil.

Keywords: Ag@CuO FM; cadmium ion; rhodamine 6G; surface enhanced raman scattering.

Grants and funding

the National Natural Science Foundation of China,No:11764046, 11304275, 11764047,61564010/National Natural Science Foundation of China