Characterization by optical and magnetic spectroscopy of a synthesized SiO 2 thin film used for radiation detector

Abstract

This work reports the synthesis and characterization of silica glass prepared by sol–gel procedure and finds out the effects of doses of gamma irradiation on the steps route of the heat-treated sample at 600 and 1100 °C. Combined characterizations of the glassy samples have been carried out by optical absorption and electron paramagnetic resonance. Also, FT infrared absorption spectra have been measured for both the heat-treated samples before and after gamma irradiation. Optical absorption spectra have identified an absorption band at 212–215 nm beside a broad band at 230–265 nm and the correlation of E′ center with heat-treatment and gamma irradiation have been followed. FT infrared absorption spectra indicate the bands within near IR region representing the vibrational modes due to water, OH and SiOH within the wavenumber range 2500–3700 cm⁻¹ are affected by heat treatment due to the elimination of organic residue and amount of OH and water. ESR investigations confirm the results obtained from optical and FTIR measurements. It is concluded from the collective data that sol–gel silica glass can serve as acceptable candidate for gamma-rays irradiator and gamma chamber dosimetry.

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