Fletcher Benjamin L, Fern Jared T, Rhodes Kevin, McKnight Timothy E, Fowlkes Jason D, Retterer Scott T, Keffer David J, Simpson Michael L, Doktycz Mitchel J
J Appl Phys. 2009 Jun 15;105(12):124312. doi: 10.1063/1.3152633. Epub 2009 Jun 29.
Anode geometry can significantly affect the electrochemical synthesis of conductive polymers. Here, the effects of anode dimensions on the electropolymerization of pyrrole are investigated. Band microelectrodes were prepared with widths ranging from 2 to 500 mum. The anode dimension has a significant effect on the resulting thickness of polymer film. The electropolymerization process deviates significantly from that predicted by simple mass transfer considerations when electrode dimensions are less than approximately 20 mum. Polymer film thickness is thinner than expected when electrode dimensions become less than approximately 10 mum. A simple mathematical model was derived to explain the observed effects of anode dimensions on the polymerization process. Simulation results confirm that diffusive loss of reaction intermediates accounts for the observed experimental trends. The described simulation facilitates understanding of the electropolymerization processes and approaches to the controlled deposition of polypyrrole, particularly at the submicron scale, for microelectromechanical systems and biomedical applications.
阳极几何形状会显著影响导电聚合物的电化学合成。在此，研究了阳极尺寸对吡咯电聚合的影响。制备了宽度范围为2至500微米的带状微电极。阳极尺寸对所得聚合物膜的厚度有显著影响。当电极尺寸小于约20微米时，电聚合过程与简单传质考虑所预测的过程有显著偏差。当电极尺寸小于约10微米时，聚合物膜厚度比预期的要薄。推导了一个简单的数学模型来解释观察到的阳极尺寸对聚合过程的影响。模拟结果证实，反应中间体的扩散损失解释了观察到的实验趋势。所描述的模拟有助于理解电聚合过程以及聚吡咯可控沉积的方法，特别是在亚微米尺度下，用于微机电系统和生物医学应用。
