Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Kyoto 615-8510, Japan.
Langmuir. 2018 Feb 20;34(7):2441-2447. doi: 10.1021/acs.langmuir.7b03792. Epub 2018 Feb 5.
Janus-type Au/polythiophene (PT) composites have been prepared by utilizing the liquid/liquid interface between water (W) and a hydrophobic ionic liquid (IL) as the redox reaction site. AuCl is reductively deposited, and terthiophene is oxidatively polymerized spacio-selectively at the IL|W interface, leading to the formation of the Au/PT composites. The composites are Janus-type Au-attached PT plates with two surface morphologies, flat surface and flowerlike surface at the W and IL sides of the plates at the IL|W interface, respectively. Not only surface morphologies but also attached Au structures are different at the two surfaces; Au microurchins on the flat surface and dendritic Au nanofibers on the flowerlike surface. Optical and scanning electron microscopic observations have revealed that nanofibers and microurchins are formed at the early and later stage of the reaction, respectively. Electrochemistry at the IL|W interface has illustrated that electron transfer across the IL|W interface during the formation of the Janus-type Au/PT composites is coupled with ion transfer of AuCl to compensate for the charge unbalance in the two liquid phases. AuCl transferred into IL is found to be the source of the dendritic Au nanofibers formed at the IL side of the PT plates.
Janus 型 Au/聚噻吩（PT）复合材料是通过利用水（W）和疏水性离子液体（IL）之间的液/液界面作为氧化还原反应位点来制备的。AuCl 在界面处被还原沉积，而噻吩则在界面处空间选择性地被氧化聚合，从而形成 Au/PT 复合材料。这些复合材料是 Janus 型的 Au 附着的 PT 板，在板的 IL|W 界面处具有两种表面形态，分别为 W 侧的平坦表面和 IL 侧的花状表面。不仅表面形态，而且附着的 Au 结构在两个表面上也不同；平坦表面上的 Au 微丛和花状表面上的树枝状 Au 纳米纤维。光学和扫描电子显微镜观察表明，纳米纤维和微丛分别在反应的早期和后期形成。IL|W 界面上的电化学表明，在 Janus 型 Au/PT 复合材料形成过程中，穿过 IL|W 界面的电子转移与 AuCl 的离子转移耦合，以补偿两相的电荷不平衡。发现在 IL 侧的 PT 板上形成的树枝状 Au 纳米纤维的来源是转移到 IL 中的 AuCl。
