Abstract

Raman-based sensors represent a promising solution to enable both detection and fingerprinting of anionic pollutants in the water distribution network. Due to the weak nature of Raman scattering, a signal intensity enhancement mechanism, such as surface enhanced Raman spectroscopy (SERS), is required. Given the combination of SERS being a first layer effect and the low affinity for metallic surfaces shown by anions, functionalization of the SERS substrates using positively charged self-assembled monolayers (SAMs) is required to guarantee a strong SERS signal. In this work, the performance of three thiol-based coatings, namely, 2-mercapto-4-methyl-pyrimidine, cysteamine, and 2-dimethyl-amino-ethanethiol, is systematically compared for the detection of nitrite, nitrate, and perchlorate ions in water. For each coating, the limit of detection of those analytes is studied in combination with commercial SERS substrates. Cysteamine-coated SERS substrates are shown to provide the lowest limit of detection for the three analytes of this study. Evaluation of this coating on real drinking water samples is reported.

© 2019 Optical Society of America

Nanoplasmonic Raman detection of bromate in water

O. S. Kulakovich, E. V. Shabunya-Klyachkovskaya, A. S. Matsukovich, Kashif Rasool, Khaled A. Mahmoud, and S. V. Gaponenko
Opt. Express 24(2) A174-A179 (2016)

On-chip 3D SERS materials produced by self-assemble of copper microparticle and galvanic replacement reaction

Haiyan Zhang, Yuan Yuan, Sheng Yan, Kai Lou, Yibo Gao, Shuxia Wang, and Yingzhou Huang
Appl. Opt. 58(17) 4720-4725 (2019)

In situ detection of trace pollutants: a cost-effective SERS substrate of blackberry-like silver/graphene oxide nanoparticle cluster based on quick self-assembly technology

Jing Yu, Yisheng Wei, Huijie Wang, Chao Zhang, Yunjia Wei, Minghui Wang, Baoyuan Man, and Fengcai Lei
Opt. Express 27(7) 9879-9894 (2019)

Colorimetric and SERS dual-mode detection of lead Ions based on Au-Ag core-shell nanospheres: featuring quick screening with ultra-high sensitivity

Zheng Zhang, Pei Ma, Junying Li, Yu Sun, Hao Shi, Nan Chen, Xuedian Zhang, and Hui Chen
Opt. Express 27(20) 29248-29260 (2019)

Superhydrophobic silver film as a SERS substrate for the detection of uric acid and creatinine

Yudong Lu, Changji Wu, Ruiyun You, Yang Wu, Huiying Shen, Lanjin Zhu, and Shangyuan Feng
Biomed. Opt. Express 9(10) 4988-4997 (2018)