SERS SENSOR BASED ON GREEN-SYNTHESIZED SILVER NANOPARTICLES FOR ULTRASENSITIVE DETECTION  OF THIRAM IN TEA LEAVES

Đồng Thị Linh; Nguyễn Văn Trường

doi:10.34238/tnu-jst.12692

SERS SENSOR BASED ON GREEN-SYNTHESIZED SILVER NANOPARTICLES FOR ULTRASENSITIVE DETECTION OF THIRAM IN TEA LEAVES

About this article

Received: 28/04/25 Revised: 30/06/25 Published: 30/06/25

Authors

1. Dong Thi Linh, TNU - University of Technology
2. Nguyen Van Truong , TNU - University of Technology

Abstract

In this study, silver nanoparticles were successfully synthesized via a green electrochemical route employing an extract of Houttuynia cordata leaves, and subsequently utilized as a substrate for surface-enhanced Raman scattering to detect trace residues of the pesticide Thiram. The resulting silver nanoparticles displayed predominantly spherical morphology with an average particle diameter of 27.3 nm and exhibited high crystallinity - features that contributed significantly to the enhancement of Raman signal intensity. The sensor achieved an impressive limit of detection of 1.1 × 10⁻¹¹ M, indicating excellent sensitivity. Assessment of the SERS substrate's repeatability and reproducibility yielded relative standard deviations of 7% and 14.4%, respectively, underscoring the platform’s analytical reliability. Application to real samples demonstrated the sensor’s practical potential: Thiram was successfully detected in green tea leaf extracts at concentrations as low as 10⁻⁹ M, with recovery rates ranging from 86% to 128%. These results affirm the sensor’s high performance and its promising applicability for rapid, sensitive screening of pesticide residues in agricultural and food products.

Keywords

Green synthesis; Silver nanoparticles; SERS; Thiram; Tea leaves

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DOI: https://doi.org/10.34238/tnu-jst.12692

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