From Molecules to Nanostructures: Syntheses, Characterizations and Manipulations
Date Issued
2012
Date
2012
Author(s)
Tseng, Kuo-Pi
Abstract
In this thesis, we synthesized amphiphilic urea-based molecules, which could
self-assemble by hydrogen-bonding, with two core platform as π-conjugated systems
and photochromic systems, then investigated their instinctive properties at the
nano-structural level. The four highly emissive derivatives performed the spontaneous
formation of spherical aggregates that can incorporate with different chromophores
giving access to study of energy-transfer processes. Elucidation of the vesicular
mechanism is explained briefly by electron microscopy as well as electrical
injection/storage in the system by KPFM. Inter-spherical energy transfer and electro
luminescence of single nano-sphere were also achieved in this work. The molecules
above were also fabricated into 1-D nanotubes through the wetting of AAO porous
templates. The polarization and waveguiding features of tubular structures and, further
the electrical characteristics of single nanotube devices were reported.
Along with the guideline in self-assembly, the photoresponsive azobenzene-based
molecules containing biuret and bis-urea groups were prepared. It is demonstrated that
molecules dominantly in trans-conformation self-assembled to form fibers and
reversible fiber-sphere transition could be tuned by irradiation of assemblies while
trans-cis photoisomerization took place into the molecular level.
Subjects
self-assembly
nanosphere
nanotube
energy transfer
photochromic
Type
thesis
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