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Molecules 2016, 21(5), 667; doi:10.3390/molecules21050667

Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate

1
Catalysis Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
2
Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2, Rafi Marg, New Delhi 110 001, India
3
Center of Excellence on Surface Science, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India
*
Authors to whom correspondence should be addressed.
Academic Editors: Sonia A. C. Carabineiro and Derek J. McPhee
Received: 1 February 2016 / Revised: 9 May 2016 / Accepted: 16 May 2016 / Published: 20 May 2016
(This article belongs to the Special Issue Coinage Metal (Copper, Silver, and Gold) Catalysis)
View Full-Text   |   Download PDF [3889 KB, uploaded 20 May 2016]   |  

Abstract

Ultra-small gold nanoparticles incorporated in mesoporous silica thin films with accessible pore channels perpendicular to the substrate are prepared by a modified sol-gel method. The simple and easy spin coating technique is applied here to make homogeneous thin films. The surface characterization using FESEM shows crack-free films with a perpendicular pore arrangement. The applicability of these thin films as catalysts as well as a robust SERS active substrate for model catalysis study is tested. Compared to bare silica film our gold incorporated silica, GSM-23F gave an enhancement factor of 103 for RhB with a laser source 633 nm. The reduction reaction of p-nitrophenol with sodium borohydride from our thin films shows a decrease in peak intensity corresponding to –NO2 group as time proceeds, confirming the catalytic activity. Such model surfaces can potentially bridge the material gap between a real catalytic system and surface science studies. View Full-Text
Keywords: thin films; model catalysis; SERS; gold nanoparticles thin films; model catalysis; SERS; gold nanoparticles
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Sunil Sekhar, A.C.; Vinod, C.P. Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate. Molecules 2016, 21, 667.

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