Walnut-like ZnO@Zn₂TiO₄ multicore-shell submicron spheres with a thin carbon layer: Fine synthesis, facile structural control and solar light photocatalytic application

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• 作者：Hyung-Seok Lim^a ; JaeSoul Lee^b ; Seunghyun Lee^b ; Yong Soo Kang^a ; Yang-Kook Sun^a ; Kyung-Do Suh^b ; ^{kdsuh@hanyang.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Polymer ; Hierarchical structure ; Multicore-shell ; Photocatalysis ; Bandgap narrowing
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：122
• 期：Complete
• 页码：287-297
• 全文大小：2961 K

文摘

In this study, we propose a fine fabrication method of walnut-like ZnO@Zn₂TiO₄ multicore-shell submicron spheres for the solar light-responsive photocatalysis. Poly(methacrylic acid/ethylene glycol dimethacrylate) [poly(MAA/EGDMA)] microspheres were used as sacrificial template to create the hierarchically-structured hybrid metal oxide spheres with a thin carbon layer. Heterogeneous multicore-shell structure like a walnut depends on the monomer ratio of poly(MAA/EGDMA) microspheres. The thin carbon layer formed on the surface of ZnO nano-grains can cause visible light response and effectively impede the recombination of photo-generated electron-hole. When the walnut-like ZnO@Zn₂TiO₄ multicore-shell submicron spheres with a thin carbon layer are tested as photocatalysts under solar light, the photodegradation of organic dye of above 93% is exhibited for 1 h due to the multiple light scattering originated from the unique structure and a coexistence of ZnO and Zn₂TIO₄.