Porous glasses as a matrix for incorporation of photonic materials. Pore determination by positron annihilation lifetime spectroscopy

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• 作者：Reisfeld ; R. ; Saraidarov ; T. ; Jasinska ; B.
• 关键词：Porous glasses ; Positron annihilation lifetime spectroscopy ; Lead sulfide ; Zirconium&ndash ; silica&ndash ; polyurethane ormocer
• 刊名：Optical Materials
• 出版年：2004
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：July, 2004
• 卷：26
• 期：2
• 页码：181-189
• 文件大小：305 K

摘要

Porous glasses prepared by the sol–gel technique have a variety of applications when incorporated by photonic materials: tunable lasers, sensors, luminescence solar concentrators, semiconductor quantum dots, biological markers. The known methods of pore size determinations, the nitrogen adsorption and mercury porosimetry allow to determine the sizes of open pores. Positron annihilation lifetime spectroscopy (PALS) allows to determine pore sizes also of closed pores. As an example we have performed measurements of non-doped zirconia–silica–polyurethane (ZSUR) ormocer glasses and the same glasses doped with lead sulfide quantum dots. The pore radii range between 0.25–0.38 nm, total surface area 15.5–23.8 m²/g.