The quenching effect of uranyl species in the photoluminescence emission and visible-light-driven water dissociation activity of CdS and TiO2 photocatalysts

被引：9

作者：

Gupta, Narendra M. ^{[1
]}

Kelkar, Sarika ^{[2
]}

Korake, Prakash ^{[1
]}

机构：

[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India

[2] Natl Chem Lab, Phys Chem Div, Pune 411008, Maharashtra, India

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2016年 / 15卷 / 06期

关键词：

QUANTUM DOTS; SPECTROSCOPY; PHOTOACTIVITY; NANOPARTICLES; LUMINESCENCE; FLUORESCENCE; PHOSPHATE; RESONANCE; SURFACE; ENERGY;

D O I：

10.1039/c6pp00022c

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Anchoring of uranyl species (2-4 mol%) led to the complete quenching of photoluminescence emission and the visible-light-driven water photodissociation activity of TiO2 (Degussa-P25) and a hydrothermally synthesized CdS photocatalyst. Photophysical measurements revealed a fast relaxation and the transfer of photogenerated electrons/energy from the TiO2 or CdS substrate to the acceptor uranyl moieties. Besides the position of flat band levels, significant overlap of the absorption/emission spectra of the host matrix and the surface-bound UO22+ species is responsible for this reverse energy transfer from a wide bandgap semiconductor to a material with a smaller band-to-band energy gap.

引用

页码：758 / 766

页数：9

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