Size-Dependent Photocatalytic Activity of Colloidal Silicon Quantum Dot

被引：21

作者：

Kojima, Takuya ^{[1
]}

Sugimoto, Hiroshi ^{[1
]}

Fujii, Minoru ^{[1
]}

机构：

[1] Kobe Univ, Grad Sch Engn, Dept Elect & Elect Engn, Nada Ku, Kobe, Hyogo 6578501, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2018年 / 122卷 / 03期

关键词：

PHOTOINDUCED ELECTRON-TRANSFER; CHARGE-TRANSFER; REDOX ACTIVITY; VISIBLE-LIGHT; CO2; REDUCTION; RHODAMINE-B; NANOCRYSTALS; HYDROGEN; LIGAND; WATER;

D O I：

10.1021/acs.jpcc.7b10967

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Photocatalytic activity of water-dispersible all-inorganic Si quantum dots (QDs) with heavily B and P codoped shells was studied by monitoring bleaching of Rhodamine B (RhB) in a mixture aqueous solution" of Si QDs and RhB under light irradiation. The size of Si QDs was changed from 2.8 to 9.0 nm. A strong size dependence was observed in the dissociation rate of RhB. The observed size dependence of the rate could be well explained by the Marcus theory, which considers charge transfer from the LUMO of Si QDs to that of RhB. Quenching of the photoluminescence (PL) and the shortening of the PL lifetime of Si QDs due to the electron transfer to RhB were also observed. From these two approaches, we demonstrated that the quantum size effect plays a crucial role for the enhanced photocatalytic activity of Si QDs.

引用

页码：1874 / 1880

页数：7

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