The Influence of the Temperature on Positron Annihilation Lifetime Spectra in Porous Sol-Gel Glass Doped with Ag Nanoparticles

M. Gorgola, B. Jasińskaa, R. Reisfeldb and V. Levchenkob aInstitute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland bChemistry Institute, Hebrew University of Jerusalem, Givat-Ram, Jerusalem 91904, Israel

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Silver nanoparticles with continuous size distribution from 10 to 20 nm were incorporated into porous glass produced using sol-gel technique. Positron annihilation lifetime spectroscopy was used to compare obtained material with an undoped reference glass. The positron annihilation lifetime spectroscopy measurement were made in a broad temperature range (from - 180°C to 200°C). The experimental lifetime values were compared with the predictions of the extended Tao-Eldrup model of the temperature range. Experimental results for the reference material were in agreement with the model, except for a small discrepancy at low temperatures. In doped material substantial changes and non-monotonous temperature dependences of intensity and lifetime values were observed. Heating the material to 200°C resulted in reorganization of the material structure.

DOI: 10.12693/APhysPolA.125.778 PACS numbers: 78.70.Bj, 36.10.Dr, 65.60.+a, 61.43.Gt