Real time observation of ZnO nanostructure formation via the solid-vapor and solid-solid-vapor mechanisms

Title
Real time observation of ZnO nanostructure formation via the solid-vapor and solid-solid-vapor mechanisms
Author(s)
장자순김봉중[김봉중]Eric Stach[Eric Stach]김민우[김민우]
Keywords
ZINC-OXIDE NANOWIRES; GROWTH; SURFACE; TEMPERATURE; ENERGY; NUCLEATION; NANOBELTS; DRIVEN; MODEL
Issue Date
201406
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.6, no.12, pp.6984 - 6990
Abstract
We report in situ transmission electron microscopy studies of the formation of ZnO nanostructures - nanoscale depressions, nanoholes, nanoribbons, and nanosheets - and the phase stability and kinetics of Au catalysts on ZnO. During annealing, the ZnO Layer produces hexagonally shaped, vertical nanoscale depressions, which increase in size along the (0001) growth direction through preferential dissociation from the {10 (1) over bar0} facet and which subsequently form hexagonal islands at their six-fold junctions. Real time observations of the annealing of Au deposited on ZnO show that the catalysts remain solid up to 900 C, an observation that has implications regarding ZnO nanowire growth via the vapor-solid-solid mechanism (VSS). The Au aka creates hexagonal nanoscale holes orgy at the Location of solid Au catalysts, via the solid-solid-vapor (SSV) mechanism. Importantly, coarsening of the Au particles is negligible due to Limited Au diffusion on the side facets of the nanoscale depressions, suggesting an approach to the growth of uniform hybrid nanowires with control over both diameter and Location. Furthermore, we directly monitor the evolution of the transformation of a nanoribbon into a nanosheet with {1010} facets. This process takes place through a periodic, kinetic roughening transition of the surface, which is controlled by the kinetic competition between surface growth and the transfer of evaporated gases. In total, these observations give new insights into multiple growth processes occurring in this important materials system.
URI
http://hdl.handle.net/YU.REPOSITORY/32055http://dx.doi.org/10.1039/c3nr06628b
ISSN
2040-3364
Appears in Collections:
공과대학 > 전자공학과 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE