@article { ISI:000380241600129,
	title = {Gold incorporated mesoporous silica thin film model surface as a robust SERS and catalytically active substrate},
	journal = {Molecules},
	volume = {21},
	number = {5},
	year = {2016},
	month = {MAY},
	pages = {667},
	publisher = {MDPI AG},
	address = {ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND},
	abstract = {<p>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 10(3) 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.</p>},
	keywords = {gold nanoparticles, model catalysis, SERS, Thin films},
	issn = {1420-3049},
	doi = {10.3390/molecules21050667},
	author = {Sekhar, Anandakumari Chandrasekharan Sunil and Vinod, Chathakudath Prabhakaran}
}
@article {46925,
	title = {Geometrical isomerism directed electrochemical sensing},
	journal = {Analytical Chemistry},
	volume = {92},
	year = {2020},
	month = {MAR},
	pages = {4541-4547},
	type = {Article},
	abstract = {<p>We report the independent role of isomerism of secondary sphere substituents over their nature, a factor often overlooked in molecular electrocatalysis pertaining to electrochemical sensing, by establishing that isomerism redefines the electronic structure at the catalytic reaction center via geometrical factors. UV-vis spectroscopy and X-ray photoelectron spectroscopy suggest that a substituent{\textquoteright}s isomerism in molecular catalysts conjoins molecular planarity and catalytic activation through competing field effects and resonance effects. As a classical example, we demonstrate the influence of isomerism of the -NO2 substituents for the electrocatalytic multi electron oxidation of As(III), a potentially important electrochemical pathway for water remediation and arsenic detection. The isomerism dependent oxidative activation of catalytic center leads to a nonprecious molecular catalyst capable for direct As(III) oxidation with an experimental detection limit close to WHO guidelines. This work opens up an unusual approach in analytical chemistry for developing various sensing platforms for challenging chemical and electrochemical reactions.</p>
},
	issn = {0003-2700},
	doi = {10.1021/acs.analchem.9b05753},
	author = {Kottaichamy, Alagar Raja and Begum, Shabbah and Devendrachari, Mruthyunjayachar Chattanahalli and Bhat, Zahid Manzoor and Thimmappa, Ravikumar and Kotresh, Harish Makri Nimbegondi and Vinod, Chathakudath Prabhakaran and Thotiyl, Musthafa Ottakam}
}
