W. Ahmad, Jingjing Wang, Linhong Wu
Feb 14, 2020
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0
Influential Citations
11
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Journal
Journal of Physical Chemistry C
Abstract
The extensive use of 4-aminothiophenol (4-ATP) as a Raman active molecule, attributes to ease in its functionalization and use for potential sensing in surface enhance Raman scattering (SERS) research. However, its SERS spectrum is susceptible to be influenced and chemically affected by several experimental factors. Thus, the current study focuses on theoretically and experimentally investigating such physicochemical factors and its counter-active stimulus to discriminate the SERS signal arising from the analyte of interest and interferents. The sensing mechanism of nitrite triggered 4-ATP that might induce its oxidation and/or dimerization and the conditions inhibiting or generating abnormal type b2 bands (1142, 1388 and 1432 cm-1) were discussed. The factors covered were: i) solvent effect; ii) laser power; iii) nature of the substrate; iv) reaction media; v) reaction kinetics and vi) influence of air or any oxygen (dissolved) containing moiety. The activation of 4-ATP by any factor forms 4,4-dimercapto...