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Femtomolar detection of thiram: via SERS using silver nanocubes as an efficient substrate

Bhavya, MB and Prabhu B, R and Shenoy, BM and Bhol, P and Swain, S and Saxena, M and John, NS and Hegde, G and Samal, AK (2020) Femtomolar detection of thiram: via SERS using silver nanocubes as an efficient substrate. In: Environmental Science: Nano, 7 (12). pp. 3999-4009.

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Official URL: https://dx.doi.org/10.1039/d0en01049a


Environmental remediation is a significant factor in maintaining a balance in nature. Pesticides are one of the main factors destroying nature by pollution and have hazardous effects on the environment and living systems. Thiram (TRM) is a fungicide used in agriculture and the rubber industry on a large scale. However, the excess use of TRM can cause harmful effects to living systems. Herein, silver nanocubes (Ag NCs) are demonstrated as an efficient substrate for the detection of TRM at ultra-low concentrations. Surface enhanced Raman scattering (SERS) is a highly sensitive technique employed for the ultra-low detection of TRM using Ag NCs. A shape-dependent comparative SERS study was carried out between Ag NCs and silver nanowires (Ag NWs), where different facets of the NCs and NWs were crucial for the creation of hotspots to enhance the detection limit. The enhancement factor (EF) for TRM with Ag NCs (TRM-Ag NCs) and TRM with Ag NWs (TRM-Ag NWs) was found to be 1.6 � 106 and 4.5 � 105, respectively. The Ag NCs showed a 3.55-folds higher enhancement compared to the Ag NWs. Theoretical studies were carried out using the finite element method (FEM) to identify the hotspots, leading to an EF in the SERS signal in the Ag NCs and NWs, and the results were consistent with the experimental observations. The limit of detection (LOD) achieved was as low as 10 fM (0.002 ppt) for TRM-Ag NCs and 1 nM (0.25 ppb) for TRM-Ag NWs, which is inevitably beneficial to human health preventing contamination in the environment. This journal is © 2020 The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Environmental Science: Nano
Publisher: Royal Society of Chemistry
Additional Information: Copyright to this article belongs to Royal Society of Chemistry
Keywords: Agricultural robots; Biological systems; Raman scattering; Rubber industry; Silver nanowires; Substrates; Surface scattering, Enhancement factor; Environmental remediation; Hazardous effects; Limit of detection; Sensitive techniques; Surface enhanced Raman Scattering (SERS); Theoretical study; Ultra low concentration, Silver, finite element method; fungicide; nanoparticle; pesticide; Raman spectroscopy; remediation; silver; substrate; thiram
Department/Centre: Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Date Deposited: 19 Jan 2021 09:34
Last Modified: 19 Jan 2021 09:34
URI: http://eprints.iisc.ac.in/id/eprint/67615

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