Porous ZnO-ZnSe nanocomposites for visible light photocatalysis

Nanoscale
Seungho ChoKun-Hong Lee

Abstract

We report the synthesis of porous ZnO-ZnSe nanocomposites for use in visible light photocatalysis. Porous ZnO nanostructures were synthesized by a microwave-assisted hydrothermal reaction then converted into porous ZnO-ZnSe nanocomposites by a microwave-assisted dissolution-recrystallization process using an aqueous solution containing selenium ions. ZnO and ZnSe nanocrystallites of the nanocomposites were well-mixed (rather than forming simple core-shell (ZnO-ZnSe) structures), particularly, in the outer regions. Both ZnO and ZnSe were present at the surface and exposed to the environment. The porous ZnO-ZnSe nanocomposites showed absorption bands in the visible region as well as in the UV region. The porous ZnO-ZnSe nanocomposites had much higher activities than the porous ZnO nanostructures. Control experiments using cutoff filters revealed that the main photocatalytic activity of the synthesized nanostructures arose from photo-excitation of the semiconductor (ZnO or ZnSe) via absorption of light of an energy equal to or exceeding the band gap energy.

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Citations

Aug 22, 2013·ACS Applied Materials & Interfaces·Gajendra Kumar PradhanK M Parida
Jul 31, 2013·Physical Chemistry Chemical Physics : PCCP·Xingyuan GuoWeiping Qin
Aug 24, 2016·Journal of Colloid and Interface Science·T MavričS Emin
Jun 16, 2016·Scientific Reports·Filippo FabbriAlessandra Catellani
Apr 20, 2017·Physical Chemistry Chemical Physics : PCCP·Ge GaoJingwei Xu
Aug 25, 2017·Methods and Applications in Fluorescence·Zhongchen BaiZhengping Zhang
Sep 19, 2019·Chemistry : a European Journal·Yongqiang ZhaoShizhang Qiao
Jun 5, 2014·Chemical Reviews·Ying-Jie Zhu, Feng Chen

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