Role of catalyst on refractive index tunability of porous silica antireflective coatings by sol-gel technique

    Authors

    A. Vincent; S. Babu; E. Brinley; A. Karakoti; S. Deshpande;S. Seal

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    THIN-FILMS; OPTICAL-CONSTANTS; LIGHT-SCATTERING; THICKNESS; SURFACES; MULTILAYERS; CELLS; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    Porous silica coatings were prepared by acid- and base-catalyzed sol-gel method. Surface morphology studies by atomic force microscopy showed smooth surface for acid-catalyzed coatings while base catalysis resulted in coarse particle morphology. On increasing the tetraethyl orthosilicate to base molar ratio from 1:1 to 1:3, the mean particle size of the coating shifted from 30 to 100 nm while the pore size varied from 4.7 to 14 nm. Infrared spectral analysis exhibited a change in the ratio of integrated peak intensities of Si-O-Si to Si-OH in acid-and base-catalyzed silica coatings. Textural studies showed an increase in particle size and porosity with base concentration. Optical transmission and surface roughness of base-catalyzed samples were found to be higher than that of acid-catalyzed silica coatings.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    111

    Issue/Number

    23

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    8291

    Last Page

    8298

    WOS Identifier

    WOS:000247034200026

    ISSN

    1932-7447

    Share

    COinS