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Journal of Spectroscopy
Volume 2018 (2018), Article ID 4127108, 9 pages
https://doi.org/10.1155/2018/4127108
Research Article

Preparation of Surface-Enhanced Raman Scattering Substrates Based on Immobilized Silver-Capped Nanoparticles

1Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Crta. de Utrera Km 1, 41013 Sevilla, Spain
2REQUIMTE/UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
3Centro Andaluz de Nanomedicina y Biotecnología (BIONAND), Calle Severo Ochoa 35, 29590 Málaga, Spain

Correspondence should be addressed to C. Caro; moc.liamg@lasracac

Received 21 January 2018; Accepted 19 February 2018; Published 8 April 2018

Academic Editor: Christoph Krafft

Copyright © 2018 C. Caro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Novel results concerning surface-enhanced Raman scattering mediated by thiol-immobilized capped silver nanoparticles attached to a silicon Si(100) substrate are presented. The attachment of the nanoparticles is achieved by chemically modifying the surface of Si(100) in order to provide sulfhydryl groups covalently linked to the substrate and then covering these surfaces with bare and polymer-capped silver nanoparticles. The modified silicon substrate, the nanoparticles, and the sensors are characterized by means of infrared and UV-vis spectroscopies and electronic microscopies. The surface-enhanced Raman scattering intensity of the new films based on polymer-capped nanoparticles is compared with that obtained with silver bare nanoparticles using rhodamine 6G as a common chromophore. These results open a new route to the design of reversible and spot-to-spot reproducible surface-enhanced Raman scattering-based sensors supported by silver nanoparticles.