Chitosan supported silver nanostructures as surface-enhanced Raman scattering sensor: Spectroscopic and density functional theory insights.

Autor: Shaikh N; Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Sayajigunj, Vadodara 390002, India., Som NN; Materials Design Division, Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wołoska Str., 02-507 Warsaw, Poland., Jha PK; Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, Gujarat 390002, India., Pamidimukkala P; Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Sayajigunj, Vadodara 390002, India. Electronic address: padmaja.sudhakar-chem@msubaroda.ac.in.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2023 Dec 31; Vol. 253 (Pt 7), pp. 127444. Date of Electronic Publication: 2023 Oct 14.
DOI: 10.1016/j.ijbiomac.2023.127444
Abstrakt: In this work, nanostructures comprising silver nanoparticles supported on a wrinkled chitosan matrix (Ag@Ch) were successfully synthesized by a simple aging process at room temperature for four days through self-assembly. Chitosan, a natural polysaccharide was used as a support as well as a reducing agent for the formation of Ag nanostructures and the creation of hotspots for SERS activity. The fabricated Ag@Ch nanostructures were characterized by several spectroscopic techniques and were used as a surface-enhanced Raman scattering (SERS) substrate. The effect of wet, dry, and liquid samples on the SERS enhancement has been studied and was found to be effective for sensing Methylene blue, Crystal Violet, and p-Nitrophenol with detection limits of 3.8, 8.1, and 8.2 ppb respectively. The SERS enhancement of the Ag@Ch was attributed to the combination of both electromagnetic (EM) and chemical effects (CE). Density functional theory (DFT) calculations were used to explain the observed surface enhancement. Good agreement was observed between the experimental and simulated spectra.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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