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The structural and optical properties of Volmer–Weber‐type ZnO nanorods
Author(s) -
Park SeJeong,
He Weizhen,
Qiu Jijun,
Kim Jin Woo,
Lee Ik Jae,
Kim Beomkeun,
Kim HyungKook,
Hwang YoonHwae
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201000054
Subject(s) - wurtzite crystal structure , nanorod , photoluminescence , raman spectroscopy , materials science , x ray photoelectron spectroscopy , annealing (glass) , spectroscopy , analytical chemistry (journal) , nanotechnology , zinc , optoelectronics , chemical engineering , optics , chemistry , composite material , metallurgy , physics , engineering , chromatography , quantum mechanics
Volmer–Weber‐type ZnO nanorods (VW ZnO NRs) were fabricated by using a hybrid method combined with RF sputtering and hydrothermal methods. The structural and optical properties of VW ZnO NRs were investigated by using synchrotron X‐ray diffraction (XRD), micro‐Raman spectroscopy, photoluminescence (PL) spectroscopy and X‐ray photoelectron spectroscopy (XPS). It was found that VW ZnO NRs showed wurtzite structure and were vertically standing on a substrate with a compressive stress from the substrate that can be reduced by annealing. In the micro‐Raman study, a forbidden E 1 (LO) mode in a bulk ZnO was observed in VW ZnO NRs due to the many edges in NR structures. It was also confirmed that VW ZnO NRs have a wurtzite structure by observing E 2 low and E 2 high peaks. In the PL spectra, VW ZnO NRs showed a broad emission in the visible range, especially yellow emission, with a weak UV emission. The UV emission was monotonously enhanced on increasing the annealing temperature. The yellow emission was enhanced in the annealed sample at 200 °C due to an evaporation of hydroxyl groups (OH − ) on the surface of VW ZnO NRs.