Premium
Synthesis and Optical Properties of Mullite Nanowires
Author(s) -
Seong HanKyu,
Kim Ungkil,
Kim MyoungHa,
Choi HeonJin,
Lee Youngho,
Seo WonSeon
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01699.x
Subject(s) - mullite , nanowire , photoluminescence , materials science , high resolution transmission electron microscopy , transmission electron microscopy , scanning electron microscope , nanotechnology , chemical engineering , crystallography , optoelectronics , composite material , chemistry , ceramic , engineering
Single‐crystalline mullite (3Al 2 O 3 ·2SiO 2 ) nanowires have been synthesized on silicon substrates by forcing aluminum and chromium chloride powders to react under an ammonia gas flow. The diameter and length of the nanowires have uniform diameters of <100 nm and several micrometers, respectively. High‐resolution transmission electron microscope and selected‐area electron diffraction analyses indicated that the nanowires were almost structural defect free and had a single‐crystalline phase with a 〈0001〉 growth direction. The photoluminescence spectra showed that the mullite nanowires reached an emission peak at the center wavelength of 442 nm originating from the Al–O bonds in preference to the Al–O and Si–O bonds in the mullite bonding structure. Comparison of the photoluminescence between as‐synthesized, oxygen–annealed, and plasma‐etched nanowires indicates that the nanowires have few defects (i.e., oxygen vacancies).