Sandwich-like CuNPs@AgNPs@PSB SERS substrates for sensitive detection of R6G and Forchlorfenuron

Shibin Han; Cheng Chen; Chen Chen; Jiajia Wang; Xin Zhao; Xuehua Wang; Xiaoyi Lv; Zhenhong Jia; Junwei Hou

doi:10.1016/j.saa.2024.124178

Sandwich-like CuNPs@AgNPs@PSB SERS substrates for sensitive detection of R6G and Forchlorfenuron

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jun 5:314:124178. doi: 10.1016/j.saa.2024.124178. Epub 2024 Mar 27.

Authors

Shibin Han¹, Cheng Chen², Chen Chen³, Jiajia Wang³, Xin Zhao¹, Xuehua Wang¹, Xiaoyi Lv⁴, Zhenhong Jia⁵, Junwei Hou⁶

Affiliations

¹ School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China.
² College of Software, Xinjiang University, Urumqi 830046, China.
³ College of Information Science and Engineering, Xinjiang University, Urumqi 830046, China.
⁴ College of Information Science and Engineering, Xinjiang University, Urumqi 830046, China; The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 840046, China. Electronic address: xjuwawj01@163.com.
⁵ College of Information Science and Engineering, Xinjiang University, Urumqi 830046, China; The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 840046, China. Electronic address: jzhh@xju.edu.cn.
⁶ State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China. Electronic address: Junweihou@cupk.edu.cn.

PMID: 38565050
DOI: 10.1016/j.saa.2024.124178

Abstract

The development of a highly sensitive, synthetically simple and economical SERS substrate is technically very important. A fast, economical, sensitive and reproducible CuNPs@AgNPs@ Porous silicon Bragg reflector (PSB) SERS substrate was prepared by electrochemical etching and in situ reduction method. The developed CuNPs@AgNPs@PSB has a large specific surface area and abundant "hot spot" region, which makes the SERS performance excellent. Meanwhile, the successful synthesis of CuNPs@AgNPs can not only modulate the plasmon resonance properties of nanoparticles, but also effectively prolong the time stability of Cu nanoparticles. The basic performance of the substrate was evaluated using rhodamine 6G (R6G). (Detection limit reached 10^-15 M, R² = 0.9882, RSD = 5.3 %) The detection limit of Forchlorfenuron was 10 μg/L. The standard curve with a regression coefficient of 0.979 was established in the low concentration range of 10 μg/L -100 μg/L. This indicates that the prepared substrates can accomplish the detection of pesticide residues in the low concentration range. The prepared high-performance and high-sensitivity SERS substrate have a very promising application in detection technology.

Keywords: CuNPs@AgNPs@PSB; Forchlorfenuron; Pesticide residue detection; SERS.

MeSH terms

Metal Nanoparticles* / chemistry
Phenylurea Compounds*
Pyridines*
Rhodamines*
Silver / chemistry
Spectrum Analysis, Raman / methods

Substances

rhodamine 6G
N-(2-chloro-4-pyridyl)-N'-phenylurea
Silver
Phenylurea Compounds
Pyridines
Rhodamines