1. Fabrication and Application of Ag@SiO 2 /Au Core–Shell SERS Composite in Detecting Cu 2+ in Water Environment.
- Author
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Zhang, Meizhen, Meng, Lin, Kalyinur, Kelgenbaev, Dong, Siyuan, Chang, Xinyi, Yu, Qian, Wang, Rui, Pang, Bo, and Kong, Xianming
- Subjects
RAMAN scattering ,COORDINATE covalent bond ,COPPER ,SERS spectroscopy ,CARBOXYL group ,AMINO group - Abstract
A sensitive and simple method for detecting Cu
2+ in the water source was proposed by using surface-enhanced Raman scattering spectroscopy (SERS) based on the Ag@SiO2 /Au core–shell composite. The Ag@SiO2 SERS tag was synthesized by a simple approach, in which Ag nanoparticles were first embedded with Raman reporter PATP and next coated with a SiO2 shell. The Ag@SiO2 nanoparticles had strong stability even in a high-concentration salty solution, and there were no changes to their properties and appearance within one month. The Ag@SiO2 /Au composite was fabricated through a controllable self-assemble process. L-cysteine was decorated on the surface of a functionalized Ag@SiO2 /Au composite, as the amino and carboxyl groups of it can form coordinate covalent bond with Cu2+ , which shows that the Ag@SiO2 /Au composite labelled with L-cysteine has excellent performance for the detection of Cu2+ in aqueous media. In this study, the SERS detection of Cu2+ was carried out using Ag@SiO2 nanoparticles, and the limit of detection (LOD) as low as 0.1 mg/L was achieved. [ABSTRACT FROM AUTHOR]- Published
- 2024
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