This paper discusses how acidic solutions affect the variation of the refractive index and thickness of a nanosize film of oxide composition (20 mol% Bi<sub>2</sub>O<sub>3</sub>, 25 mol% Fe<sub>2</sub>O<sub>3</sub>, 55 mol% TiO<sub>2</sub>), deposited on a glass substrate by the sol–gel method. When the film is allowed to stand in the solutions, it simultaneously swells, with an increase of its thickness, and dissolves. The swelling initiates an increase of the refractive index, and the dissolution reduces it.
© 2012 OSA
Original Manuscript: February 28, 2012
Published: December 31, 2012
A. B. Atkarskaya and V. G. Shemanin, "How acidic solutions affect the optical properties of nanosize coatings," J. Opt. Technol. 79, 802-805 (2012)