Femtomolar detection of thiram via SERS using silver nanocubes as an efficient substrate
| Autor: | Prangya Bhol, B Ramya Prabhu, M. B. Bhavya, Manav Saxena, Swarnalata Swain, Akshaya K. Samal, Gopalkrishna Hegde, Neena S. John, Bhamy Maithry Shenoy |
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| Rok vydání: | 2020 |
| Předmět: |
Detection limit
Thiram Materials science Materials Science (miscellaneous) Substrate (chemistry) Nanotechnology 02 engineering and technology Silver nanowires 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Highly sensitive chemistry.chemical_compound symbols.namesake Human health chemistry symbols 0210 nano-technology Raman scattering General Environmental Science |
| Zdroj: | Environmental Science: Nano. 7:3999-4009 |
| ISSN: | 2051-8161 2051-8153 |
| DOI: | 10.1039/d0en01049a |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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