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Fabrication of Single‐Crystal α‐Al 2 O 3 Nanorods by Displacement Reactions
Author(s) -
Deng ChengJi,
Yu Peng,
Yau ManYan,
Ku ChiuShan,
Ng Dickon H. L.
Publication year - 2003
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.1151-2916.2003.tb03480.x
Subject(s) - rod , nanorod , transmission electron microscopy , materials science , sintering , fabrication , yield (engineering) , nanometre , single crystal , chemical engineering , diffraction , crystallography , scanning electron microscope , crystal (programming language) , nanotechnology , composite material , optics , chemistry , programming language , computer science , medicine , alternative medicine , physics , pathology , engineering
Nanometer‐sized Al 2 O 3 rods are fabricated by sintering a powder mixture of Al and SiO 2 . The sintered product is leached in HF–HNO 3 solution, followed by rinsing and washing before the nanorods are collected. The yield of the product is about 50 wt%. Transmission electron microscopy reveals that these rods are 1 to 2 μm long and have a diameter of 20 to 100 nm, while electron diffraction confirms that these rods are single crystals of α‐Al 2 O 3 . It is observed that these rods have either round or slightly sharp tips, which is different from those having droplet‐like tips that are usually found in products fabricated by catalytic reactions.