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To dimerize or not: para-aminothiophenol on a bismuth heterostructure.
Poonam Bhadoria1, Arti Saroj1, Venkatnarayan Ramanathan1
1Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh, 221005, India. vraman.chy@iitbhu.ac.in.
Physical Chemistry Chemical Physics : PCCP
|March 20, 2023
Summary
This study demonstrates a novel bismuth-based substrate for surface-enhanced Raman spectroscopy (SERS) using p-aminothiophenol (PATP). The substrate prevents PATP conversion, offering a new tool for chemical analysis.
Area of Science:
- Materials Science
- Spectroscopy
- Nanotechnology
Background:
- Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique.
- Noble metal substrates often induce chemical transformations in analytes.
- Bismuth-based materials are emerging as alternative substrates.
Purpose of the Study:
- To investigate the SERS performance of novel β-Bi2O3/Bi2O2CO3 nanoparticles.
- To evaluate the stability of p-aminothiophenol (PATP) on this new substrate.
- To understand the underlying mechanisms using computational methods.
Main Methods:
- Experimental SERS measurements of PATP on β-Bi2O3/Bi2O2CO3 nanoparticles.
- Comparison with SERS on conventional noble metal surfaces.
- Density Functional Theory (DFT) calculations (PW91PW91/LANL2DZ/6-311+G(d,p)).
Main Results:
- The β-Bi2O3/Bi2O2CO3 nanoparticles exhibited a low limit of detection of 1 mM for PATP.
- Unlike on noble metals, PATP did not convert to p,p'-dimercaptoazobenzene (DMAB) on the bismuth substrate.
- DFT calculations confirmed experimental findings and revealed charge transfer from PATP to the substrate.
Conclusions:
- β-Bi2O3/Bi2O2CO3 nanoparticles are effective SERS substrates for PATP without inducing analyte transformation.
- This novel substrate offers advantages over traditional noble metal surfaces for specific applications.
- The study provides fundamental insights into substrate-analyte interactions in SERS.
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