INVESTIGADORES
COMEDI David Mario
artículos
Título:
Hierarchical ZnO nanostructures: Growth mechanisms and surface correlated photoluminescence
Autor/es:
G. GRINBLAT; M. G. CAPELUTO; M. TIRADO; A. V. BRAGAS; D. COMEDI
Revista:
APPLIED PHYSICS LETTERS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2012 vol. 100 p. 233116 - 233120
ISSN:
0003-6951
Resumen:
ZnO nanowires were grown by vapor-transport and deposition on Au
nanocluster covered fused and thermal silica and c-Si. The nanowire size
and density depended strongly on the substrate type. By decreasing the O2
to local Zn partial pressure ratio, the growth pattern changed to
nanocombs and nanosheets. ZnO nanohedgehogs were found on bare c-Si. We
observe a remarkable correlation between the defect to exciton
photoluminescence intensity ratio and the nanostructures specific
surface areas. These results indicate that changes in strain and O
deficiency defects at surfaces are behind the observed morphology
changes, one to two-dimensional growth transition, and corresponding
luminescence.