Three-Dimensional Type II ZnO/ZnSe Heterostructures and Their Visible Light Photocatalytic Activities

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• 作者：Seungho Cho ; Ji-Wook Jang ; Jungwon Kim ; Jae Sung Lee ; Wonyong Choi ; Kun-Hong Lee
• 刊名：Langmuir
• 出版年：2011
• 出版时间：August 16, 2011
• 年：2011
• 卷：27
• 期：16
• 页码：10243-10250
• 全文大小：1100K
• 年卷期：v.27,no.16(August 16, 2011)
• ISSN：1520-5827

文摘

We report a method for synthesizing three distinct type II 3D ZnO/ZnSe heterostructures through simple solution-based surface modification reactions in which polycrystalline ZnSe nanoparticles formed on the surfaces of single-crystalline ZnO building blocks of 3D superstructures. The experimental results suggested a possible formation mechanism for these heterostructures. The formation of the ZnO/ZnSe heterostructures was assumed to result from a dissolution鈥搑ecrystallization mechanism. The optical properties of the 3D ZnO/ZnSe heterostructures were probed by UV鈥搗is diffuse reflectance spectroscopy. The 3D ZnO/ZnSe heterostructures exhibited absorption in the visible spectral region. The visible photocatalytic activities of 3D ZnO/ZnSe heterostructures were much higher than those of the 3D pure ZnO structures. The activities of the 3D ZnO/ZnSe heterostructures varied according to the structures under visible light. The morphologies and exposed crystal faces of pure ZnO building blocks prior to surface modification had a significant effect on the visible light photocatalytic processes of ZnO/ZnSe heterostructures after surface modification.