Photosensitized generation of singlet oxygen in powders and aqueous suspensions of silicon nanocrystals

被引:0
作者
Yu. V. Ryabchikov
I. A. Belogorokhov
M. B. Gongalskii
L. A. Osminkina
V. Yu. Timoshenko
机构
[1] Russian Academy of Sciences,Lebedev Physical Institute
[2] State Research and Design Institute of the Rare Metal Industry (GIREDMET),Faculty of Physics
[3] Moscow State University,undefined
来源
Semiconductors | 2011年 / 45卷
关键词
Singlet Oxygen; Porous Silicon; Oxygen Molecule; Oxygen Atmosphere; Silicon Nanocrystals;
D O I
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学科分类号
摘要
The photoluminescence spectra and kinetics in powders and aqueous suspensions produced from porous silicon layers are studied. The systematic features of photosensitized generation of singlet oxygen by silicon nanocrystals in the samples are established. The dependence of the efficiency of generation of singlet oxygen on the pressure of molecular oxygen is analyzed. It is concluded that the generation can be described on the basis of concepts of energy transfer from photoexcited silicon nanocrystals to oxygen molecules adsorbed at the nanocrystal surface to the concentration described by Langmuir’s adsorption model. The processes limiting the efficiency of photosensitized generation of singlet oxygen in the systems are discussed.
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页码:1059 / 1063
页数:4
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