Optical and morphological characterization of Si nanocrystals/silica composites prepared by sol-gel processing

被引:37
作者
Borsella, E
Falconieri, M
Botti, S
Martelli, S
Bignoli, F
Costa, L
Grandi, S
Sangaletti, L
Allieri, B
Depero, L
机构
[1] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy
[2] Consorzio Padova Ric, Padua, Italy
[3] ENEA, INN, NUMA, MATAV, Rome, Italy
[4] ENEA, INN, FIS, SPET, Rome, Italy
[5] GDE SRL, Novara, Italy
[6] Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, Brescia, Italy
[7] Univ Brescia, INFM, Dip Ingn Meccan, Unita Brescia, I-20124 Brescia, Italy
来源
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2001年 / 79卷 / 01期
关键词
optical non-linearity; quantum effects; Raman spectroscopy; silicon; silicon oxide;
D O I
10.1016/S0921-5107(00)00551-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Linear (visible photoluminescence) and non-linear (third-order susceptibility) optical properties have been measured for laser-synthesized crystalline Si nanoparticles. The observed luminescence is compared to similar measurements on nanocomposite aerogels prepared integrating the Si-nanoparticles into a continuous silica phase by sol-gel processing. The results show that incorporation of the Si-nanoparticles into a silica matrix by sol-gel technology is not detrimental to the PL (photoluminescence) emission intensity. The effect on the nanocomposites of annealing in air (at temperatures in the range of 300-500 degreesC) has been investigated by means of PL and Raman spectroscopy. The obtained results indicate that the oxidation treatment induces the bleaching of the smaller luminescent particles and is not effective in reducing the average size. Micro-Raman mapping and TEM analysis of the nanocomposites have shown the presence of agglomerated nanoparticles tin the sub-micrometer range), as confirmed by dynamic light scattering (DLS) measurements on colloidal suspensions of the as-synthesized powders. (C) 2001 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:55 / 62
页数:8
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