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Name (Title):
Baodan Liu (NIMS Postdoc)
Affiliation:
International Center for Materials Nanoarchitectonics, (MANA), NIMS
Address:
1-1 Namiki, Tsukuba. Ibaraki 305-0044, Japan
Email: baodanliu@gmail.com
Home Page: http://www.nims.go.jp/mana/
Presentation Title:
Compositional design, structural analysis and property studies of one-dimensional (1D) wide
band-gap semiconductor nanostructures
Abstract:
Here we demonstrate that diverse nanostructures including (needle-like) nanowires,
(bicrystalline) nanobelts, nanotubes, nanocones and other novel architectures made of various
wide band-gap semiconductors, e.g. GaN, ZnS, AlN, GaP, SiC and so forth can be fabricated
through a well-designed and carefully controlled chemical vapor deposition (CVD). The
nanostructures growth was promoted by a catalyst particle attached to their tips, and the vaporliquid-solid
(V-L-S) growth mechanism thus became in effect. The size, morphology,
crystallinity, phase composition,
purity, and properties of the
nanomaterials were delicately
tuned through an experimental
conditions control. Moreover, some
complex nanostructures can also be
fabricated for specific applications.
Analyses of crystallography,
phases, and constituents of these
novel nanostructures were carried
out by means of a 300-kV
transmission electron microscope
(TEM) equipped with an energy
dispersive X-ray spectrometer
(EDS) and an electron energy loss
(EELS) spectrometer. Optical and
electrical measurements on the
present nano-semiconductors
indicated that they exhibit potential
applications in novel nano-
optoelectronic devices, field
emission transistors (FET) and
sensors with a tunable working
wavelength, i.e. from ultraviolet
(UV) to a visible light.
References:
[1] B. D. Liu et al, J. Phys. Chem. B, 109, (2005) 10782.
Poster Session PM-3
Fig. (a) Low magnification TEM image; (b) HRTEM image and (c)
corresponding electron diffraction (ED) patterns of a bicrystalline ZnS
nanobelt.
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