Medda, Samar Kumar and Mitra, Moumita and De, Goutam (2008) Tuning of Ag-SPR band position in refractive index controlled inorganic-organic hybrid SiO(2)-PEO-TiO(2) films. JOURNAL OF CHEMICAL SCIENCES, 120 (6). pp. 565-572. ISSN 0974-3626

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Abstract

Inorganic (silica-titania)-organic (polyethylene oxide) hybrid films with variable refractive index (RI) values were synthesized and Ag nanoparticles were generated in situ inside such hybrid films to develop coloured coatings specially on plastic substrates. The hybrid films and the corresponding Ag-incorporated films were prepared from sols derived from a mixture of silicon tetraethoxide (STE), 3-(glycidoxypropyl)trimethoxysilane (GPTMS), titanium tetraisopropoxide (TTIP) and silver nitrate following a sol-gel dip-coating method and cured at low temperature (90A degrees C), followed by UV treatment with an energy equivalent to 5 center dot 3 +/- 0 center dot 1 J cm(-2). The equivalent SiO(2): SiO(1 center dot 5)(CH(2))(3)OCH(2)CH(CH(2))O: TiO(2): Ag molar ratios (nominal) of the final cured films are varied in the ranges (67 center dot 9-0): 29 center dot 1: (0-67 center dot 9): 3. The refractive index values of the cured hybrid films were found to be increased systematically from 1 center dot 475 to 1 center dot 710 with increasing Ti-component. The Ag-SPR peak, in case of silica-polyethylene oxide host (RI = 1 center dot 475), observed at 419 nm, gradually red-shifted to 497 nm upon increasing the Ti-component (equivalent TiO(2) content 67 center dot 9 mol%; RI = 1 center dot 710) of the film. As a consequence, a systematic change of Ag-SPR position yielded yellow, yellowish-orange, orange, brownish-orange and orangish-brown coloured coatings.

Item Type:	Article
Additional Information:	International Conference on Molecules and Materials - New Directions, Bangalore, INDIA, DEC 04, 2008
Uncontrolled Keywords:	Ag-plasmon tuning; inorganic-organic hybrids; refractive index tailoring; coloured coatings; sol-gel
Subjects:	Physical Properties
Divisions:	UNSPECIFIED
Depositing User:	Bula Ghosh
Date Deposited:	18 Jan 2012 07:07
Last Modified:	18 Jan 2012 07:07
URI:	http://cgcri.csircentral.net/id/eprint/363

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