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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Surface-enhanced Raman scattering of thiram: Quantitative and theoretical analyses

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Author(s):
Oliveira, Marcelo J. S. [1] ; Martin, Cibely S. [1] ; Rubira, Rafael J. G. [1] ; Batagin-Neto, Augusto [2] ; Constantino, Carlos J. L. [1] ; Aroca, Ricardo F. [3]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ UNESP, Sch Technol & Appl Sci, Presidente Prudente - Brazil
[2] Sao Paulo State Univ UNESP, Campus Itapeva, Itapeva - Brazil
[3] Univ Windsor, Windsor, ON - Canada
Total Affiliations: 3
Document type: Journal article
Source: Journal of Raman Spectroscopy; v. 52, n. 12, SI AUG 2021.
Web of Science Citations: 2
Abstract

The development of strategies to monitor the applications of pesticides is of primary importance. In the present report, two aspects of the surface-enhanced Raman scattering (SERS) effect of the fungicide thiram were investigated: quantitative analysis using the standard addition method and the thiram adsorption mechanism onto Ag nanostructures using theoretical approach. Experimentally, SERS intensity varies linearly from 1.0 x 10(-8) to 4.0 x 10(-7) mol/L with thiram concentration leading to a limit of detection of 1.2 x 10(-8) mol/L for the band at 560 cm(-1) and 1.7 x 10(-9) mol/L for 1386 cm(-1). The loss of linearity (above 10(-6) mol/L) was associated with changes in the Ag colloid aggregation, also indicated by complementary analyses via UV-Vis extinction spectroscopy, dynamic light scattering, and zeta potential. The differences in the spectral profiles observed for thiram Raman powder and SERS are ascribed to S-S cleavage, leading the degraded thiram adsorbing to Ag surface not only through S atoms but also through methyl groups. (AU)

FAPESP's process: 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/15019-0 - Combination of confocal fluorescence microscopy and surface-enhanced Raman scattering techniques: interaction, detection, and quantification of molecules of interest in biomimetic system.
Grantee:Cibely da Silva Martin Sonvesso
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 20/05423-0 - Detection of pesticides (cocktails) used in sugarcane crops and their effect on biological systems
Grantee:Rafael Jesus Gonçalves Rubira
Support Opportunities: Scholarships in Brazil - Post-Doctoral