Kinetics-driven growth of orthogonally branched single-crystalline magnesium oxi

2020-02-24 22:54:20

single nanostructures oxide crystalline morphologies

责任者: Yufeng Hao;Guowen Meng;Changhui Ye;Xueru Zhang;Lide Zhang 单位: Key Lab. of Mater. Phys., Chinese Acad. of Sci., Hefei, China 来源出处: Journal of Physical Chemistry B(J. Phys. Chem. B (USA)),2005/06/09,109(22):11204-8 摘要: Orthogonally branched single-crystalline magnesium oxide nanostructures were synthesized through a simple chemical vapor transport and condensation process in a flowing Ar/O2 atmosphere. Other morphologies, such as cubes and nanowires, can also be obtained under different controlled conditions. The formation of different types of nanostructures can be tuned by modifying oxygen partial pressure during the synthesis. All the nanostructures are cubic single-crystalline enclosed by low-index {100} facets. Growth mechanisms for the nanostructures are discussed in detail: different supersaturation ratios, relatively high substrate temperatures, and surface defects in certain crystallographic planes cooperatively take important effects on determining the product morphologies. Structural defect-related blue light emission of the three types of MgO nanostructures was investigated. The MgO nanostructures with abundant morphologies may find applications in various nanodevices, and the kinetics-driven methodology might be exploited to synthesize similar nanostructures of other functional oxide materials 关键词: crystal faces;crystal growth from vapour;crystal morphology;magnesium compounds;nanostructured materials;photoluminescence;kinetics-driven growth;orthogonally branched single-crystalline magnesium oxide nanostructures;chemical vapor transport;condensation process;Ar/O2 flowing atmosphere;crystal morphologies;nanowires;oxygen partial pressure;cubic single-crystals;low-index {100} facets;growth mechanisms;supersaturation ratios;relatively high substrate temperatures;surface defects;crystallographic planes;product morphologies;structural defect-related blue light emission;MgO nanostructures;nanodevices;functional oxide materials;MgO