期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 24, 页码 22561-22568出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506684c
关键词
3D hierarchical superstructures; titania; evolution; ripening; photocatalysis
资金
- National Natural Science Foundation of China [21207148]
- National Basic Research Program of the PRC [2011CB936001]
- National Key Technology RD Program [2012BAC07B02]
Unique 3D hierarchical anatase TiO2 superstructures with evolvable morphologies and tunable sizes were successfully fabricated through a facile solvothermal route without using any structure-directing additives. A complex assembly process involving nucleation of nascent nanoparticles, agglomeration and ordered attachment of tiny nanocrystals, and regrowth induced by metastable crystal phase was put forward for the formation and morphology evolution of the anatase superstructures. It was revealed the crystalline phase experienced a ripening process from semicrystal to mesocrystal status accompanying the morphologies evolving from peony-like to chrysanthemum-like and eventually to spherical structures. The obtained 3D hierarchical anatase TiO2 superstructures exhibited superior photocatalytic activities for organic pollutant degradation, which could be largely attributed to the more efficient light-harvesting ability and the high specific surface area of the unique structures.
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