Pt-Based Nanostructures for Observing Genuine SERS Spectra of p-Aminothiophenol (PATP) Molecules

Abstract

By one-pot wet chemical method, Pt-based hollow nanostructures were synthesized at room temperature. Because of the highly damping optical response of the metal, these Pt-based hollow nanostructures exhibited weak thermal effects with a laser focal spot on 4-aminothiophenol (PATP) molecules limiting dimerisation. The isolated surface enhanced Raman scattering (SERS) spectra of PATP, in which the vibrational bands from 4,4 -dimercaptoazobenzene (DMAB) molecules are not observed, were able to be seen, and this was in good agreement with the Raman spectra of PATP powder. In addition, the concentration of PATP molecules was varied, and the illumination time was increased to 2000 s, respectively. It was found that spectra were stable with varied PATP concentrations, and the plasmon-driven chemical conversion of PATP to DMAB was still suppressed, even when the laser illumination time was increased to 2000 s.

To dimerize or not: para-aminothiophenol on a bismuth heterostructure

“…“They concluded that the reaction time and reaction extent can be controlled by choosing different SERS systems and by changing the laser power and also the solution concentration of the molecule. 20 Similarly in another study by Wang et al 21 they also observed the genuine SERS spectra of PATP (10 −4 mol L −1 ) on Pt-based hollow nanostructures where the peaks of DMAB (1140, 1390 and 1432 cm −1 ) were not observed. Even upon varying the concentration of PATP from 10 −5 to 10 −7 mol L −1 along with prolonged exposure to laser irradiation (532 nm, 0.3 mW), they persistently observed the SERS spectra of PATP in a reproducible manner.…”

“…molecule. 20 Similarly in another study by Wang et al 21 1) is used which was proposed by Ru et al 34,35 as a means to evaluate the efficiency of SERS as a tool for specific analytes.…”

“…19,20 Similarly, the actual SERS spectra of PATP have also been observed on Pt-based nanostructures. 21 However, since the SERS signals of PATP vary with experimental conditions and with different metal SERS substrates, information of metal-PATP molecule adsorption for genuine SERS spectra is of essential importance to understand the adsorption behavior of PATP molecules. Recently it was reported that a bismuth based non-noble metal can be utilized as a SERS active substrate for the study of molecular species 22 in lieu of the conventional noble-metal SERS substrates.…”