Surface plasmon-catalyzed oxidation of 4-aminodiphenyl disulfide for determination of Ag+ ion in aqueous samples

Ye Sun; Yao Zhang; Yue Wang; Lixin Xia

doi:10.1007/s00604-020-04428-y

Surface plasmon-catalyzed oxidation of 4-aminodiphenyl disulfide for determination of Ag⁺ ion in aqueous samples

Mikrochim Acta. 2020 Jul 20;187(8):462. doi: 10.1007/s00604-020-04428-y.

Authors

Ye Sun¹, Yao Zhang², Yue Wang¹, Lixin Xia³

Affiliations

¹ College of Chemistry, Liaoning University, Shenyang, 110036, People's Republic of China.
² College of Chemistry, Liaoning University, Shenyang, 110036, People's Republic of China. zhangyao@lnu.edu.cn.
³ College of Chemistry, Liaoning University, Shenyang, 110036, People's Republic of China. lixinxia@lnu.edu.cn.

PMID: 32685995
DOI: 10.1007/s00604-020-04428-y

Abstract

A new sensor for determination of Ag⁺ ion (Ag⁺) by surface-enhanced Raman scattering (SERS) is reported. Gold nanoparticles (AuNPs) and 4-aminodiphenyl disulfide (APDS) were chosen as the SERS substrate and probe molecule, respectively. With the addition of Ag⁺, three new peaks (1141, 1392, and 1435 cm^-1) appeared in the SERS spectrum, indicating that the conversion of APDS to p,p'-dimercaptoazobenzene (DMAB) was achieved. As the concentration of Ag⁺ increased, the conversion of APDS to DMAB also increased and showed a good linear relationship (R² = 0.9746) in the range of 10 to 100 μM of Ag⁺. The limit of detection (LOD) was 7 μM. Compared with the traditional determination method, the SERS method is convenient and fast and requires no complicated preprocessing. Graphical abstract.

Keywords: AuNPs; DMAB; River water sample; SERS sensor.

Publication types

Research Support, Non-U.S. Gov't