We have successfully fabricated ordered, well-crystallized Bi2S3 nanowire arrays embedded in the nanochannels of porous
anodic aluminium oxide templates by direct current electrodeposition
from a dimethylsulfoxide solution containing BiCl3 and
elemental sulfur. X-ray diffraction and selected area electron
diffraction investigations demonstrate that the Bi2S3
nanowires have an orthorhombic uniform structure. Electromicroscopy
results show that the nanowires are quite ordered with diameters of
about 40 nm and lengths up to 5 µm. X-ray energy dispersion
analysis indicates that the atomic composition of Bi and S is very close
to a 2 : 3 stoichiometry. The optical properties of these nanowires
were characterized by optical absorption techniques. These studies
reveal that the annealed Bi2S3 nanowires have an optical
band edge (direct) of about 1.56 eV.
Single-crystalline Bi nanowire arrays have been assembled into the
nanochannels of anodic alumina membranes by electrodeposition. X-ray
diffraction and transmission electron microscopy investigations revealed that
the nanowires with diameter of either 50 nm or 20 nm are essentially single
crystalline and highly oriented. The magnetotransport properties of the Bi
nanowire arrays were measured, and positive magnetoresistance as high as 45%
at 100 K was observed.}
\fnm{3}{Author to whom correspondence should be addressed.
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