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Controlled growth of silver nanoparticles through a chemically assisted photocatalytic reduction process for SERS substrate applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
26754 43975 2014 11 PDF Available
Title
Controlled growth of silver nanoparticles through a chemically assisted photocatalytic reduction process for SERS substrate applications
Abstract

•We propose a low cost method for the elaboration of rather large size SERS substrates.•Ag° NPs have been grown through a chemically assisted photocatalytic reduction mechanism.•TSC contributes to a uniform photocatalytic growth of Ag° NPs owing to its capping effect.•A seeded growth procedure on AA-derived seeds reinforces the uniform growth of Ag° NPs.•So-formed Ag°/TiO2 heterostructures exhibit good SERS performances for the detection of R6G.

The deposition of Ag° nanoparticles (NPs) has been performed through a photocatalytic reduction process on the surface of sol–gel deposited TiO2 thin films. So-formed Ag°/TiO2 heterostructures are intended for Surface-Enhanced Raman Scattering (SERS) substrate applications. The photocatalytic growth of Ag° NPs has been chemically assisted by tri-sodium citrate (TSC) and a seeded growth procedure based on ascorbic acid (AA) has been developed. Field Emission Gun-Scanning Electron Microscopy, Transmission Electron Microscopy, and Energy Dispersive X-ray characterizations have been used to assess how the chemical assistance of the photocatalytic reduction process enables an enhanced uniformity of the Ag° NPs deposition. Then, Raman spectroscopy studies have been performed to assess the SERS performances of Ag°/TiO2 heterostructures on rhodamine 6G (R6G). It is shown that a TSC-based photocatalytic reduction process associated to an AA-based seeded growth is a low cost liquid solution elaboration procedure leading to good SERS performances, i.e. a 106 enhancement factor and a detection limit of R6G ranging between 10−8 and 10−10 M, as well as a good reproducibility of the SERS spectra on rather large dimension substrates.

Keywords
Silver nanoparticles; Titanium oxide; Photocatalytic reduction; SERS substrate
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Controlled growth of silver nanoparticles through a chemically assisted photocatalytic reduction process for SERS substrate applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 277, 1 March 2014, Pages 1–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us