Effect of gamma rays absorbed doses and heat treatment on the optical absorption spectra of silver ion-exchanged silicate glass

Abstract

International audienceSamples of a commercial silicate glass have been subjected to ion exchange at 320 degrees C in a molten mixture of AgNO3 and NaNO3 with molar ratio of 1:99 and 5:95 for 60 min. The ion exchange process was followed by gamma irradiation in the dose range of 1-250 kGy and heating at the temperature of 550 degrees C for different time periods ranging from 10 to 582 min. The spectral absorption in UV Vis range of the Ag-Na ion exchanged glass was measured and used to determine the states of silver prevailing in the glass during the ion exchange, the gamma irradiation and the heat treatment. The gamma irradiation induced holes and electrons in the glass structure leading to the creation of a brown colour, and silver ions trapped electrons to form silver atoms. We observed the first stage of aggregation after irradiation, as well as after heating. The silver atoms diffused and then aggregated to form nanoclusters after heating at 550 degrees C. A characteristic band at about 430 nm was induced. The surface Plasmon absorption of silver nanoclusters in the glass indicated that the nanoclusters radius grew between 0.9 and 1.43 nm with increasing of annealing time from 10 to 242 min and then saturated. We also found that the size of aggregates depends on the value of gamma radiation absorbed dose. Contrary to what was expected, we found that 20 kGy is the optimal absorbed dose corresponding to the larger size of the aggregates which decreases for absorbed doses above 20 kGy. (C) 2014 Elsevier B.V. All rights reserved

Study of the dual effect of gamma irradiation and strontium substitution on bioactivity, cytotoxicity, and antimicrobial properties of 45S5 bioglass

“…the figure showed that the degradation rate increased for both S0 and S5 glass samples until 50 kGy. This could be explained by assuming that creation of glass network defects and increase of number of nonbirding oxygens (NBOs) as a result of gamma irradiation . For more clarification, the effect of irradiation on solids including glasses depends not only on the energy of irradiation but also on the nature of irradiated glass species itself.…”

“…This could be explained by assuming that creation of glass network defects and increase of number of nonbirding oxygens (NBOs) as a result of gamma irradiation. 24,[33][34][35][36] For more clarification, the effect of irradiation on solids including glasses depends not only on the energy of irradiation but also on the nature of irradiated glass species itself. Gamma irradiation causes many changes in the electronic distribution of glass due to ionization.…”

Plasmonic resonance of Ag nanoclusters diffused in soda-lime glasses

“…The ion exchange technique combined with thermal annealing has received an increase in attention as it can be used to introduce metallic nanoclusters such as silver, gold and copper into a soda-lime matrix. 20 Nano-sized Ag/Ag 2 O nanoclusters in glass matrices have been found to be suitable candidates for potential applications in optical data storage. [21][22][23] In this work, Ag nanoclusters dispersed in a soda-lime glass by the ion-exchange method at 370 1C followed by thermal annealing (in air) at various temperatures for the nucleation and growth of Ag nanoclusters in soda-lime glasses have been investigated.…”

Opacity and plasmonic properties of Ag embedded glass based metamaterials

“…20 Soda-lime silicate glass embedded with silver nanoclusters can be synthesized by various methods such as, ion-implantation, melt-quench techniques, low energy ionbeam mixing, physical vapor deposition, ion exchange methods etc. [19][20][21][22][23] Among these methods the ion exchange method has been considered one of the most important techniques to introduce metallic nanoclusters inside the glass surface because the technique is simple and does not require any sophisticated equipment. The ion exchange technique combines with thermal annealing has received an increasing attention as it can be used to introduce metallic nanoclusters such as silver, gold and copper into soda-lime matrix.…”

“…The ion exchange technique combines with thermal annealing has received an increasing attention as it can be used to introduce metallic nanoclusters such as silver, gold and copper into soda-lime matrix. [22][23][24][25] The main objective of the work presented in this paper is preparation and study of the plasmonic effects of silver nanoclusters embedded in glass matrix by thermal ion exchange process.…”