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Laser Assisted Catalytic Growth of ZnS/CdSe Core‐Shell and Wire‐Coil Nanowire Heterostructures
Author(s) -
Wu ShengJia,
Venugopal Rayapati,
Chen YitTsong
Publication year - 2005
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200500102
Subject(s) - nanowire , heterojunction , wurtzite crystal structure , transmission electron microscopy , chemistry , pulsed laser deposition , nanotechnology , optoelectronics , materials science , crystallography , thin film , hexagonal crystal system
ZnS/CdSe core‐shell and wire‐coil nanowire heterostructures have been synthesized by chemical vapor deposition assisted with pulsed laser ablation. Measurements from high‐resolution transmission electron microscopy and selected area electron diffraction have revealed that both ZnS/CdSe core‐shell and wire‐coil nanowires are of single‐crystalline hexagonal wurtzite structures and grow along the [0001] direction. While the lattice parameters of ZnS and CdSe in the core‐shell nanowires are nearly equal to those of bulk ZnS and CdSe, change of the lattice parameters in the CdSe‐coil is attributed to the doping of Zn into CdSe, resulting in the relaxation of compressive strain at the interface between CdSe‐coil and ZnS‐wire. Composition variation across the interfacial regions in the ZnS/CdSe nanowire heterostructures ranges only 10–15 nm despite the pronounced lattice mismatch between ZnS and CdSe by ˜11%. Growth mechanisms of the ZnS/CdSe nanowire heterostructures are discussed.