| Summary: | 碩士 === 國立中正大學 === 化學研究所 === 85 === The main theme of this thesis is focused on the
electrochemical method which is used to prepare various types of
metal nanoparticles suspendsd either in organic solvent systems
or in aqueous solutions. Cationic surfactants which form
micelles in the electrolytic solution act as both supporting
electrolytes and stabilizers to provent the further growth of
nanoparticles. For the gold nanoparticles organic solvent
dispersions, both UV-Vis. absorption spectra and TEM micrographs
were measured for the determination of particle growth and their
size distributions. Several experimental parameters, such as
synthetic time,types of surfactants, surfactant concentrations,
electric current,...etc., have been demonstrated to be crucial
to achieve our goal: the controllability of the mean particle
sizes and narrower size distribution. The other part of my
research is to prepar vaious types of metal nanoparticlesaqueous
dispersions by using modified electrochemical systems. The
syntheses of silver nanoparticles, gold nanorods, gold
nanowires, and gold/silver alloy nanoparticles have been
successful via using special combinations of surfactants,co-
surfactants and micelle-loosing agents. Absorption spectra and
TEM images were constantly employed to obtain the size/shape
dependent spectral features and the size/shape distributions. I
have also conducted calculations based on classical
electrostatic model to obtain the predicted spectra for several
metal nanoparticle systems and to compare some of them to our
experimental results.
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