Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 6, Pages 3600-3604Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2008.10.005
Keywords
Hydrophobic; Roughness; Contact angle; Optical transmission; Silica thin films
Categories
Funding
- University Grant Commission (UGC), New Delhi
- Board of Research in Nuclear Sciences (BRNS)
- Department of Atomic Energy (DAE), Mumbai, Government of India [2007/37/18/BRNS]
- BRNS-DAE
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The present paper describes the room temperature synthesis of dip coated water repellent silica coatings on glass substrates using trimethylethoxysilane (TMES) as a co-precursor. Silica sol was prepared by keeping the molar ratio of tetramethoxysilane (TMOS) precursor, methanol (MeOH) solvent, water (H2O) constant at 1:29.27:2.09 respectively, with 0.5 M NH4OH throughout the experiments and the TMES/TMOS molar ratio (M) was varied from 0 to 3.8. It was found that with an increase in M value, the roughness and hydrophobicity of the films increased, however the optical transmission decreased from 93% to 57% in the visible range. The hydrophobic silica films retained their hydrophobicity up to a temperature of 250 degrees C and above this temperature the films became hydrophilic. The hydrophobic silica thin films were characterized by taking into consideration the surface roughness studies, Fourier transform infrared (FT-IR) spectroscopy, percentage of optical transmission, scanning electron microscopy (SEM) and contact angle measurements. (C) 2008 Elsevier B.V. All rights reserved.
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