NanoElectroChemistry Group, ITODYS, UMR 7086 CNRS, Université Paris Diderot, Sorbonne Paris Cité , 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
ACS Appl Mater Interfaces. 2013 Oct 23;5(20):10159-64. doi: 10.1021/am402846n. Epub 2013 Oct 14.
Polypyrrole (PPy) films were electrodeposited from a pyrrole/sodium salicylate solution in water, through two-dimensional (2-D) polystyrene (PS) templates self-assembled on various oxidizable metals, after which the template was removed by dissolution in tetrahydrofuran (THF). The resulting PPy films were analyzed by scanning electron microscopy and atomic force microscopy. Two-dimensional PPy honeycomb structures are obtained on copper or mild steel by using PS spheres of various sizes. The morphology of these structures was controlled electrochemically, as an increase in the polymerization charge does not disturb the PPy honeycomb arrangement, leading instead to the formation of deeper pores accompanied by a change in their diameter. The hydrophobicity of the reduced micro-structured PPy surface is much greater than that of a bulk PPy film generated on the same metal. Reversible electro-switching of the wettability was obtained with marked variation of the apparent contact angle upon PPy oxido-reduction, and an important effect of film micro-structuration upon the wettability range.
聚吡咯 (PPy) 薄膜是通过在水中的吡咯/水杨酸钠溶液中进行电沉积，在各种可氧化金属上自组装二维 (2-D) 聚苯乙烯 (PS) 模板，然后用四氢呋喃 (THF) 溶解模板而得到的。通过扫描电子显微镜和原子力显微镜对所得的 PPy 薄膜进行了分析。通过使用不同尺寸的 PS 球，在铜或软钢上获得了二维 PPy 蜂窝状结构。这些结构的形态通过电化学控制，因为聚合电荷的增加不会干扰 PPy 蜂窝排列，而是导致形成更深的孔，同时其直径发生变化。还原后的微结构化 PPy 表面的疏水性远远大于在相同金属上生成的块状 PPy 薄膜。通过 PPy 的氧化还原作用，明显改变了表观接触角，实现了润湿性的可逆电切换，并且薄膜微结构化对润湿性范围有重要影响。
