Thiam El Hadji Yade, Dramé Abdoulaye, Sow Salif, Sene Aboubacary, Szczepanski Caroline R, Dieng Samba Yandé, Guittard Frédéric, Darmanin Thierry
Faculté des Sciences et Techniques, Département de Chimie, Université Cheikh Anta Diop, B.P. 5005 Dakar, Senegal.
Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States.
ACS Omega. 2019 Aug 1;4(8):13080-13085. doi: 10.1021/acsomega.9b00969. eCollection 2019 Aug 20.
In this work, we present the synthesis of original thieno[3,4-]thiophene monomers with rigid substituents (e.g., perfluorinated chains, and aromatic groups) and demonstrate the ability to prepare nanotubular and nanoporous structures via templateless, surfactant-free electropolymerization in organic solvents (dichloromethane). For the majority of synthesized monomers, including a significant amount of water in the electropolymerization solvent leads to the formation of nanoporous membranes with tunable size and surface hydrophobicity. If water is not included in the electropolymerization solvent, most of the surfaces prepared are relatively smooth. Tests with different water contents show that the formation of nanoporous membranes pass through the formation of vertically aligned nanotubes and that the increase in water content induces an increase in the number of nanotubes while their diameter and height remain unchanged. An increase in surface hydrophobicity is observed with the formation of nanopores up to ≈300 nm in diameter, but as the nanopores further increase in diameter, the surfaces become more hydrophilic with an observed decrease in the water contact angle. These materials and the ease with which they can be fabricated are extremely interesting for applications in separation membranes, opto-electronic devices, as well as for sensors.
在这项工作中，我们展示了具有刚性取代基（如全氟链和芳族基团）的新型噻吩并[3,4 - ]噻吩单体的合成，并证明了通过在有机溶剂（二氯甲烷）中进行无模板、无表面活性剂的电聚合制备纳米管和纳米多孔结构的能力。对于大多数合成单体而言，在电聚合溶剂中加入大量水会导致形成尺寸和表面疏水性可调的纳米多孔膜。如果电聚合溶剂中不加水，制备的大多数表面相对光滑。不同含水量的测试表明，纳米多孔膜的形成过程经过垂直排列的纳米管的形成阶段，并且含水量的增加会导致纳米管数量增加，而其直径和高度保持不变。随着直径达≈300 nm的纳米孔的形成，观察到表面疏水性增加，但随着纳米孔直径进一步增大，表面变得更亲水，水接触角减小。这些材料及其易于制备的特性对于分离膜、光电器件以及传感器的应用极具吸引力。
