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Sol-Gel Synthesis of Thick Ta2O5 Films for Photonic Band Gap Materials

Published online by Cambridge University Press:  01 February 2011

Nicholas Ndiege ,
Tabitha Wilhoite ,
Vaidyanathan Subramanian ,
Mark Shannon  and
Rich Masel
Nicholas Ndiege
Affiliation:
ndiege@uiuc.edu, University of Illinois, Chemistry, 294 RAL, 600 S. Mathews ave., Urbana, IL, 61801, United States, 217 333 6666
Tabitha Wilhoite
Affiliation:
wilhoite@uiuc.edu, University of Illinois, Chemistry, Urbana, IL, 61801, United States
Vaidyanathan Subramanian
Affiliation:
vsubrmnn@uiuc.edu, University of Illinois, Chemical & Biomolecular Engineering, Urbana, IL, 61801, United States
Mark Shannon
Affiliation:
mshannon@uiuc.edu, University of Illinois, Urbana, IL, 61801, United States
Rich Masel
Affiliation:
r-masel@uiuc.edu, University of Illinois, Chemical & Biomolecular Engineering, Urbana, IL, 61801, United States
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Abstract

Advances in microelectromechanical systems has generated an ever growing demand for novel insulating material applicable to high temperature systems. Photonic bandgap materials are appealing for such applications, specifically Ta2O5 due to its high index of refraction, refractory nature and negligible absorbance in the infrared region. The challenge faced in the realization of such materials is the synthesis of crack free Ta2O5 films whose thickness is in the order of a quarter wavelength of the incident infrared radiation.

This work seeks to investigate the effect of addition of polyvinyl pyrollidone (PVP) as a binder material in the sol gel synthesis of thick, uniform and crack free Ta2O5 films. Incorporation of PVP into the sol precursor has enabled uniform and crack free films with thicknesses of up to 2.4 microns to be realized. Chemical probing of the precursor was conducted via TGA, FTIR, and NMR analysis of the sol to elucidate the processes behind this film formation. The calcined oxide films were characterized via SEM, XRD and XPS.

Keywords

sol-gelTainsulator
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 929: Symposium II – Materials in Extreme Environments , 2006 , 0929-II04-18
Copyright
Copyright © Materials Research Society 2006

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