Size Effects on the Optical Properties and the Application toward Nanotechnology of Gold Nanoparticles and Organic Nanomaterials
Date Issued
2004
Date
2004
Author(s)
Kuo, Chin-Kuei
DOI
en-US
Abstract
In the thesis, we presented some of our progress in size effects on the
optical properties and the application toward nanotechnology of gold
nanoparticles and organic nanomaterials. This topic was, in fact, composed of
many aspects of nanomaterials. They included basic properties and size
controlled preparations of gold nanoparticles, fabrication, characterization and
photophysical features of organic nanomaterials, photophysical interactions
between fluorophores and gold nanoparticles, and growth of semiconductor 1-D
nanomaterials. Accordingly, it is obvious that the discussion cannot be merged
into a single chapter. Therefore, we divided our discussions into four parts.
In Chapter 2, historical introduction of preparation and basic properties of
gold nanoparticles is surveyed (Sections 2.1-2.6). This chapter is not the major
part of the thesis. They are here to work as a basic knowledge for further
discussions. In Section 2.6, we report our fabrication and characterization of
size-controlled gold nanoparticles (applied to studies in Chapters 4 and 5).
Chapter 3 highlights a simple procedure for the preparation of organic
nanomaterials and its application on many organic compounds. Photophysic
properties of these nanomaterials were studied. We have proposed an approach
to analyze packing order of molecules in nanomaterials. This helps one to
correlate photophysic features of organic nanomaterials with the packing order
of molecules.
Chapter 4 emphasizes the interaction between gold nanoparticles and
fluorescent organic nanocrystals. In the system, gold nanoparticles worked as
fluorescent quenchers of the organic nanocrystals. The emission of the
nanocrystals was gradually reduced as the amount of gold nanoparticles
increased. The mechanism of the quenching is analyzed. The quenching rate
was found to be size-dependent with the gold nanoparticles. The exciton
dynamics in the perylene nanocrystals were altered by interactions between gold
nanoparticles and the nanocrystals.
In Chapter 5, gold nanoparticles of various sizes were applied to the
diameter-selective growth of GaN (gallium nitride) nanowires. The limitation of
low solubility of N in Au and the in-equilibrium condition were conquered. By
using gold nanoparticles with distinct size, GaN wires with various size
distributions were obtained. The growth dynamics were also surveyed. This
demonstrates the application of preformed gold nanoparticles in
size-controllable preparation of semiconductor materials and envisages promising future of nanotechnology.
Subjects
尺寸效應
金奈米顆粒
奈米科技
氮化鎵奈米線
有機奈米晶體
nanotechnology
size effect
gallium nitride nanowires
gold nanoparticle
organic nanocrystal
Type
thesis
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