二氧化矽-聚苯胺核層結構微米粒子之製備及其在電化學防腐蝕及電化學感測器之應用與研究

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doi:10.6840/cycu201100394

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二氧化矽-聚苯胺核层结构微米粒子之制备及其在电化学防腐蚀及电化学感测器之应用与研究

Preparation of SiO2–PANI Core-shell Micro-particles and Their Application Studies on Electrochemical Anticorrosion and Electrochemical Sensor

陈亚伦 , 硕士　　导师：叶瑞铭　　

繁体中文 DOI： 10.6840/cycu201100394

核层粒子；二氧化矽-聚苯胺；抗静电；防腐蚀；生物感测器； silica-polyaniline ； core-shell ； anticorrosion ； biosensor ； anti-static

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This dissertation is focused mainly on the preparation of core-shell micro-particles and developed their potentially application in anticorrosion coatings and sensor through the electrochemical measurements. It should be noted that the SiO2-Polyaniline (SP) core-shell microparticles were synthesized by conventionally base-catalyzed sol-gel process. First of all, SiO2 particles anchored aniline functional groups of ~ 800 nm was prepared followed by characterized by solid-state nuclear magnetic resonance (SS-NMR). Subsequently, SP was prepared by performing the chemically oxidative polymerization of aniline monomers in the presence of aniline anchored SiO2 particles. The as-prepared SP particles of ~ 1050 nm was obtained and followed by characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy and ultraviolet - visible spectroscopy (UV-Visible). The thickness of polyaniline shell can be estimated ~ 120 nm by transmission electron microscopy (TEM).
For the physical property studies, electrochemical cyclic voltammetric (CV) and four-point probe technique were employed to evaluate the electro-activity and electrical conductivity of as-prepared core-shell micro-particles.
IV
For the “anti-static” corrosion protection application studies, electrochemical corrosion measurements of DBSA-doped PS composite coatings containing different loading of core-shell particles was performed through the Tafel plot observations. Incorporation of core-shell micro-particles not only increased the gas barrier of corresponding composite membranes but also introduced the antistatic properties into the composites. Moreover, gas permeability analysis (GPA) and water vapor transmission rate analysis (VPA) of as-prepared PS composite membranes were demonstrated that incorporation of core-shell particles may effectively increased the gas (especially O2) barrier properties, which supporting the anticorrosion data. The redox capability of PANI resulted from the shell component of core-shell micro-particles may induced the formation of passivation oxide layers, which can be identifized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). PS composites containing 10 wt-% of DBSA-doped core-shell particles was found to reveal electrical resistance of ~ 109 /sq, which meet the requirement of anti-static scale.
For second part associated with the electrochemical sensor application, gold (III) chloride trihydrate (HAuCl4) was used to instead of oxidant (i.e.,ammonium persulfate) by chemical polymerization of aniline monomers in
V
the presence of aniline anchored SiO2 particles to give series of gold decorated SiO2-PANI core-shell microspheres (GDSP). The morphology, electro-activity, electrical conductivity and thermal properties of as-prepared GDSP were confirmed by scanning electron microscopy (SEM), cyclic valtammetric (CV) analysis, four-point probe technique and thermogravimetric analysis (TGA), respectively.
It should be noted that the gold nanoparticles attached onto the core-shell micro-particles can be confirmed by use of wide-angle X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS); Detection of Ascorbic acid (AA) and Dopamine (DA) can be performed by carrying out the electrochemical cyclic voltammetric (CV) studies of GDSP-modified Pt electrode with better sensitivity and linearity.

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[1] B. M. Novak, Adv. Mater. (1993) 5, 422.
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[4] D. C. Lee, L. W. Jang, J. Appl. Polymer. Sci. (1996) 61, 1117.
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[8] A. G. Green, A. E. Woodhead, J. Chem. Soc. Trans. (1910) 97, 2388.
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[10] A. G. MacDiarmid, J. C. Chiang, M. Halpern, W. S. Huang, S. L. Mu, N. L. D. Somasir, Mol. Liq. Cryst. (1985) 121, 173.
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DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。