1. Hydrothermally controlled ZnO nanosheet self-assembled hollow spheres/hierarchical aggregates and their photocatalytic activities
- Author
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Dae-Hwang Yoo, Soon Wook Kim, Nguyen Tri Khoa, Eui Jung Kim, Sung Hong Hahn, and Doan Van Thuan
- Subjects
Materials science ,Quantum yield ,Nanotechnology ,General Chemistry ,Condensed Matter Physics ,Hydrothermal circulation ,Absorbance ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Photocatalysis ,General Materials Science ,Irradiation ,Methylene blue ,Trisodium citrate ,Nanosheet - Abstract
We synthesized ZnO nano-micro structures, including microrods, nanosheets, a nanosheet self-assembled hollow sphere (NSHS), and a hollow hierarchical aggregate (HHA) by changing the concentration of trisodium citrate in a hydrothermal process. The NSHS was formed by the self-assembly of 2D nanosheets on the surface of a formaldehyde bubble, while the HHA was obtained by the self-assembly and hierarchical arrangement of NSHS. The photocatalytic activities of the ZnO structures were evaluated from the degradation of methylene blue under visible and black light irradiation. The NSHS showed better photocatalytic performance due to its excellent photon absorbance, low defect density and low emission quantum yield compared with the HHA. Furthermore, the size and number of the 2D nanosheets hydrothermally grown on the NSHS bubble template were controlled by changing the growth temperature.
- Published
- 2014
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