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Self-assembly of catecholic ferrocene and electrochemical behavior of its monolayer

机译：儿茶酚二茂铁的自组装及其单层电化学行为

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Self-assembly of catecholic ferrocene was studied on different surfaces. The self-assembly kinetics of Fc-terminated (Fc-dopamine) self-assembled monolayers (SAMs) and their stability have been studied and characterized using atomic force microscopy (AFM) and cyclic voltammetry (CV), respectively. AFM images have revealed that the self-assembly process of Fc-dopamine molecules on a mica surface follows the systematic increase of surface coverage with assembly time until a closely packed density is reached. The redox behavior of the Fc-dopamine monolayer in NaClO4 electrolyte solutions was characterized using CV, and the stability of the Fc-dopamine SAMs on an Au surface at different pH values and voltages was evaluated. CV results show that the Fc-dopamine SAMs are stable over a scan voltage range of -0.8-1.0 V under pH values lower than 11, but very rapidly destroyed above pH 11. Finally, the wetting behavior of the Fc-dopamine grafted on rough surfaces is tuned by a redox reaction of the Fc group in SAMs, which exhibits superhydrophobicity with a static water contact angle of 161 degrees on anodized alumina surfaces, and hydrophilicity with a CA of 5 degrees after Fc is oxidized. The work provides useful information for understanding the adhesion and deposition mechanisms of catecholic compounds on substrates.
机译：研究了不同表面上的儿茶酚二茂铁的自组装。分别使用原子力显微镜（AFM）和循环伏安法（CV）研究并表征了Fc端基（Fc-多巴胺）自组装单分子膜（SAMs）的自组装动力学及其稳定性。 AFM图像显示，云母表面上的Fc-多巴胺分子的自组装过程随组装时间的增加而逐渐增加，直至达到紧密堆积的密度。使用CV表征Fc-多巴胺单层在NaClO4电解质溶液中的氧化还原行为，并评估了在不同pH值和电压下Fc-多巴胺SAM在Au表面的稳定性。 CV结果表明，在pH值低于11时，Fc-多巴胺SAM在-0.8-1.0 V的扫描电压范围内是稳定的，但在pH高于11时却非常迅速地被破坏。最后，在粗糙条件下接枝的Fc-多巴胺的润湿行为通过SAM中Fc基团的氧化还原反应来调节表面，该表面在阳极氧化铝表面上表现出超疏水性，静态水接触角为161度，在Fc氧化后具有5度CA的亲水性。这项工作提供了有用的信息，可用于了解儿茶酸化合物在基材上的粘附和沉积机理。

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