| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 94 === Abstract
The main objective of the present investigation is to synthesize and characterize the nanocomposites consisting of metal particles and conducting polymers. Aniline or 2,5-dimethoxyaniline(DMA) is used as monomer. AgNO3, CH3SO3Ag or H2PtCl6 is used as oxidant or precursor of metal.
First, PDMA-Ag composite is successfully obtained by oxidative polymerization of DMA in poly(styrene sulfonic acid)(PSS) using AgNO3 or CH3SO3Ag as oxidant. In-situ UV-Vible spectroscopy results show that the growth rate of PDMA is strongly affected by NO3 - and CH3SO3 -. The coupling reaction of PDMA and NO3 – was proposed to explain the lower growth rate of PDMA and by using AgNO3 than CH3SO3Ag as oxidant. X-ray photoelectron spectroscopy and FTIR spectroscopy were used to validate the proposed coupling reaction by monitoring the side product and oxidant state of PDMA. The results show that there are more side products and lower oxidized states for the composite structure in the presence of NO3 – than CH3SO3 -, being agreeable to the proposal. Transmission electron microscopy shows that Ag nanoparticles have almost the same size irrespective of anions.
Second, composite consisting of Ag or Pt particles and polyaniline nanofibers is successfully obtained by interfacial polymerization and illuminate UV light. CH3SO3Ag or H2PtCl6 is used as precursor of metal. Transmission electron microscopy shows that the polyaniline nanofibers are about 10~40 nm, Ag or Pt particles are about 5~10 nm. Nanocomposites are characterize by FTIR spectroscopy and Thermal Gravimetric Analysis. The result show that the oxidized states almost the same size irrespective of oxidant or precursors of metals. And nanocomposites are more thermal stable than polyaniline nanofibers. The composite consisting of Pt particles can also use as catalyst to oxidant methanol.
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