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Small structures: selective growth of nanosheets with high density {101} twin boundaries on anatase {001} high energy crystal plane

wallpapers News 2020-07-13
The

nanocrystals rich in twin boundaries have unique physical chemical properties but the controllable synthesis of nanocrystals with high density twin boundaries is very challenging. The methods of wet chemistry physical / chemical vapor deposition laser ablation for the synthesis of nanocrystals with twin boundaries are complex difficult to obtain nanocrystals rich in twin boundaries. Therefore the development of a simple effective method to synthesize nanocrystals with high density twin boundaries is of great significance to the basic Application Research of such crystals.

Professor Zhao Huijun Center for clean environment energy Griffith University Australia developed a simple hydrothermal synthesis method by using the mechanism of crystal epitaxy growth triggered by adding titanium nitride under hydrothermal conditions successfully realized the selective growth of nanosheet array epitaxial layer with high density {101} twin boundary on the {001} high energy crystal plane of anatase. As functional materials

titanium dioxide is widely used in many fields especially in the field of photocatalysis. The reported results show that the photocatalytic properties of these materials are closely related to their crystal phase exposed crystal face their catalytic activity can be improved by controlling the growth of crystals with high energy exposure crystal faces. Although the idea of using twin boundary to improve catalytic activity has been reported it is very difficult to confirm the structure of twin boundary the mechanism of promoting catalytic activity due to the inability to control the distribution of twin boundary in crystal especially the very low density of twin boundary. In this work we report that the epitaxial growth of nanosheet arrays rich in {101} twin boundaries can be achieved on the {001} high-energy anatase crystal surface by the hydrothermal method. Different from the reported rutile {101} rutile {301} anatase {112} twin boundaries the results of our research on the crystal growth process show that the epitaxial layer is composed of nanosheet arrays connected by {101} twin boundaries {001} planes. Theoretical calculations show that the new {101} twin boundary b structure has a valence b corrected by the {001} high energy plane. Compared with anatase single crystal without twin boundary the surface homojunction is more conducive to the separation of photogenerated holes electrons the enrichment of photogenerated holes on the high density {101} twin boundary surface which improves the photocatalytic oxidation performance. This study provides a simple example for the synthesis of nanocrystals rich in twin boundaries has enlightenment for the development of other twin crystals.


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