In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon...In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon controlling appropriate deposition times and flow rates of the precursor,two epitaxial growth modes of SnO_(2),i.e.a continuous thick film and well-arranged one-dimensional nanostructures were observed in the ZnO/SnO_(2) core-shell micropyramids.Taking advantages of the difference in acid resistance between ZnO and SnO_(2),the as-prepared ZnO/SnO_(2) micropyramids were further converted into SnO_(2) hollow micropyramids with a facile acid-etching treatment.Structural analysis revealed that the lattice mismatch degree between epitaxial planes determines the preferential growth direction of the SnO_(2) epitaxial layer on the ZnO surface.Compared to the pristine ZnO template,interestingly,the ZnO/SnO_(2) core-shell micropyramids exhibited very strong green emission around 504 nm.Such enhanced green emission should be induced by high-density structural defects generated in the interfacial area during the epitaxial growth.展开更多
基金supported by the National Natural Science Foundation of China(21171142)the National Basic Research Program of China(2011CBA00508)+1 种基金the program for New Century Excellent Talents in University(NCET-11-0294)the Fundamental Research Funds for the Central Universities.
文摘In this paper,ZnO/SnO_(2) core-shell micropyramids were successfully prepared via a chemical vapor deposition process that is based on the epitaxial growth of SnO_(2) on the surface of ZnO hexagonal micropyramids.Upon controlling appropriate deposition times and flow rates of the precursor,two epitaxial growth modes of SnO_(2),i.e.a continuous thick film and well-arranged one-dimensional nanostructures were observed in the ZnO/SnO_(2) core-shell micropyramids.Taking advantages of the difference in acid resistance between ZnO and SnO_(2),the as-prepared ZnO/SnO_(2) micropyramids were further converted into SnO_(2) hollow micropyramids with a facile acid-etching treatment.Structural analysis revealed that the lattice mismatch degree between epitaxial planes determines the preferential growth direction of the SnO_(2) epitaxial layer on the ZnO surface.Compared to the pristine ZnO template,interestingly,the ZnO/SnO_(2) core-shell micropyramids exhibited very strong green emission around 504 nm.Such enhanced green emission should be induced by high-density structural defects generated in the interfacial area during the epitaxial growth.
