Premium
Raman and photoluminescence properties of ZnO nanowires grown by a catalyst‐free vapor‐transport process using ZnO nanoparticle seeds
Author(s) -
Güell Frank,
MartínezAlanis Paulina Raquel,
Khachadorian Sevak,
RubioGarcía Javier,
Franke Alexander,
Hoffmann Axel,
Santana Guillermo
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552651
Subject(s) - photoluminescence , materials science , nanowire , raman spectroscopy , nanoparticle , raman scattering , nanotechnology , chemical engineering , optoelectronics , optics , physics , engineering
We report the synthesis of ZnO nanowires by a catalyst‐free vapor‐transport process on SiO 2 /Si substrates. A modification of the method was performed using small ZnO nanoparticles (∼5 nm) in low concentration suspensions. The use of dichloromethane or toluene in the suspensions influences the nanoparticle distribution over the surface. The obtained nanowires have diameters ranging from 20 to 100 nm and lengths from 0.5 to 1 µm. Raman scattering results show a narrow (∼7 cm −1 ) full width at half maximum of the E 2 high optical phonon mode, which demonstrate a good‐crystal quality of the ZnO nanowires obtained. Room temperature photoluminescence measurements show a broad emission band in the visible range at 430–830 nm, which is attributed to intrinsic defects. A notable decrease of this visible band was achieved making this method suitable for almost defect‐free ZnO nanowires. The photoluminescence results at 5 K demonstrate the role of surface defects as responsible for the visible band.