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Preparation and Characterization of Surface modification Porous silica/Polypyrrole Nanocomposites
|關鍵字:||聚吡咯;多孔二氧化矽;碳層;電化學感測器;多巴胺;Polypyrrole;Porous silica;Carbon layer;Electrochemical sensor;Dopamine||引用:|| S. Hou, M. L. Kasner, S. Su, K. Patel, and R. Cuellari, 'Highly Sensitive and Selective Dopamine Biosensor Fabricated with Silanized Graphene,' The Journal of Physical Chemistry C, vol. 114, no. 35, pp. 14915-14921, 2010/09/09 2010.  C. K. Chiang, C. R. Fincher, Y. W. Park, A. J. Heeger, H. Shirakawa, E. J. Louis, S. C. Gau, and A. G. MacDiarmid, 'Electrical Conductivity in Doped Polyacetylene,' Physical Review Letters, vol. 39, no. 17, pp. 1098-1101, 10/24/ 1977.  Y. Chai, T. Guo, C. Jin, R. E. Haufler, L. P. F. Chibante, J. Fure, L. Wang, J. M. Alford, and R. E. Smalley, 'Fullerenes with metals inside,' The Journal of Physical Chemistry, vol. 95, no. 20, pp. 7564-7568, 1991/10/01 1991.  S. Iijima and T. Ichihashi, 'Single-shell carbon nanotubes of 1-nm diameter,' Nature, vol. 363, p. 603, 06/17/online 1993.  K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. 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In this study, the porous SiO2 (MCM-41) nanoparticle were prepared by sol-gel method. Carbon layer obtained from glucose was formed on the surface of porous SiO2 by hydrothermal method (MC).The porous MC was further thermal treated at 550°C (assigned by MC*). The MC*/PPy nanocomposites were synthesized by in-situ polymerization with different weight ratios of pyrrole monomer and MC*.The morphologies of the PPy、MC*、MC*/PPy nanocomposites were characterized through SEM and TEM. Electrochemical behavior of the PPy、MC*、MC*/PPy nanocomposites were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV).
For the different ratio of MC*/PPy nanocomposite system, the particle size of PPy was measured by SEM images and was gradually decreased with increasing the loading of MC*. The peak current of PPy increases from 25μA to 38μA with 5wt% MC* content (5MC*P) at a scan rate 50mV/s. The impedance value of PPy, 5MC*P were 57.9 Ω and 35.3Ω, respectively. Obviously, the addition of MC* can reduce the impedance value due to the increase of the surface area and good conductivity of MC*.
For 5MC*P composite, the linear range of electrochemical response in dopamine (DA) was 1-200μM and the detection limit was 0.7μM (S/N=3). After 7 days of 5MC*P stored at room temperature, the initial current response remained 83%. In addition, 5MC*P-modified electrode was also detected with dopamine, ascorbic acid and uric acid. The electrochemical potential differences among the three detected peaks were 151 mV (AA to DA), 142 mV (DA to UA) and 293 mV (AA and UA), respectively.
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