Precipitation of Ag Nanoparticles on Tellurite Glass Surface via Thermal Poling

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  • Kawase Sonoko
    Department of Material Chemistry, Graduate School of Engineering, Kyoto University
  • Ukon Sakiko
    Department of Material Chemistry, Graduate School of Engineering, Kyoto University
  • Murai Shunsuke
    Department of Material Chemistry, Graduate School of Engineering, Kyoto University
  • Fujita Koji
    Department of Material Chemistry, Graduate School of Engineering, Kyoto University PRESTO, Japan Science and Technology Agency (JST)
  • Tanaka Katsuhisa
    Department of Material Chemistry, Graduate School of Engineering, Kyoto University

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  • 熱ポーリング処理によるテルライトガラス表面での銀超微粒子の析出
  • ネツ ポーリング ショリ ニ ヨル テルライト ガラス ヒョウメン デノ ギン チョウビリュウシ ノ セキシュツ

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Abstract

Thermal poling has been applied to 2Ag2O·3Na2O·25ZnO·70TeO2 (in mol%) glass sandwiched in between two commercially-available cover glasses, and precipitation of Ag nanoparticles has been induced selectively in the vicinity of anode-side glass surface. Migration of Na+ during the thermal poling has been investigated by means of energy dispersive x-ray spectroscopy (EDX) to clarify the mechanism of Ag precipitation. The elemental analysis on the surfaces of cover glasses and tellurite glass samples using EDX indicates that the drift velocity of Na+ in the tellurite glass is lower compared to that in cover glass, suggesting that Na+ ions accumulate near the anode-side surface of tellurite glass to facilitate the reduction of Ag+ to Ag. Also, the radius and volume fraction of nanoparticles are evaluated by theoretical fit using Mie scattering theory and Drude free electron theory, and the variation of size and amount of Ag nanoparticles with poling conditions such as poling temperature, time, and voltage is discussed.

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