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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Investigation of the Generation of Singlet Oxygen in Ensembles of Photoexcited Silicon Nanocrystals by Electron Paramagnetic Resonance Spectroscopy
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Investigation of the Generation of Singlet Oxygen in Ensembles of Photoexcited Silicon Nanocrystals by Electron Paramagnetic Resonance Spectroscopy

机译：电子顺磁共振波谱研究光激发硅纳米晶体集合体中单线态氧的产生

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摘要

The generation of singlet oxygen is investigated and its concentration upon photoexcitation of silicon nanocrystals in porous silicon layers is determined using electron paramagnetic resonance spectroscopy. The relaxation times of spin centers, i.e., silicon dangling bonds, in vacuum and in an oxygen atmosphere in the dark and under illumination of the samples are measured for the first time. It is revealed that the spin-lattice relaxation in porous silicon is retarded as compared to that in a single-crystal substrate. From analyzing experimental data, a microscopic model is proposed for interaction of oxygen molecules in the triplet state and spin centers at the surface of silicon nanocrystals. The results obtained have demonstrated that porous silicon holds promise for the use as a photosensitizer of molecular oxygen in biomedical applications.
机译：研究了单重态氧的产生，并使用电子顺磁共振波谱测定了多孔硅层中硅纳米晶体光激发后的单线态氧浓度。首次测量了在黑暗中和在光照下在真空和氧气气氛中自旋中心（即硅悬空键）的弛豫时间。揭示了与单晶衬底相比，多孔硅中的自旋晶格弛豫受到阻碍。通过分析实验数据，提出了三重态态氧分子与硅纳米晶体表面自旋中心相互作用的微观模型。获得的结果表明，多孔硅有望在生物医学应用中用作分子氧的光敏剂。

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