Biomedical Engineering Reference
In-Depth Information
extremities in particular.
210
Surprisingly, it was found that the tips evolve
inhomogeneously, with a few precise sites developing faster than others. As
a result, the caps remain closed speciically when catalysts are not employed,
while they maintain a round shape during the shrinking process.
The authors also investigated the illing capability of different CNTs with
diameters >1.4 nm under photoluminescence spectroscopy.
211
Previously,
Okada and co-workers predicted that C
60
molecules can enter the interior
space of SWCNTs without friction at diameter
≥
1.3 nm
212-214
without
changing upon fullerene insertion. In this diameter region, eficient coupling
(hybridisation) between the π states of C
60
and the nearly free electron (NFE)
states of SWCNTs occurs. The results of this study revealed the characteristic
band gap shifts of SWCNTs upon C
60
encapsulation. For nanopeapods with
smaller diameters (
d
t
≤
1.32 nm), the band gap of SWCNTs was modiied
by the mechanical strain because of encapsulated C
60
. For larger-diameter
regimes (
d
t
≥
1.32 nm), hybridisation between the π state of C
60
and the NFE
state of SWCNTs induced the same effects as the small reduction of the tube
diameter, resulting in the family type-dependent band gap shifts.
9.4.2 Japan
Hiromichi KATAURA
@
Self-assembled Nano-electronics group
@ National Research Institute
@ Advanced Industrial Science and Technology (AIST)
Expertise: Encapsulation of and reactions inside carbon nanotubes
and their electronic properties
Prof. Kataura is the leader of the Self-assembled Nano-electronics group at the
University of Tsukuba. This is one of the 15 groups that constitute the National
Research Institute (NRI). The NRI emphasises the foresight role played by
theory and computational science in nanotechnology, develops novel nano-
processing and characterisation technologies and promotes substantial
R&D aimed at the development of novel nanomaterials, nanodevices and
nanobiotechnology. NRI is an essential component of Advanced Industrial
Science and Technology (AIST), which is a non-government institution
including over 50 autonomous research units (e.g., NRI) in various innovative
research ields; the units are located at nine research bases and several sites
(smaller than research bases) of AIST all over Japan. About 2,500 research
scientists and over 3,000 visiting scientists, post-doctoral fellows and
students work at AIST.
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