Electronic-State Changes of Ferrocene-Terminated Self-Assembled Monolayers Induced by Molecularly Thin Ionic Liquid Layers: A Combined Atomic Force Microscopy, X-ray Photoelectron Spectroscopy, and Ultraviolet Photoelectron Spectroscopy Study
Electronic-State Changes of Ferrocene-Terminated Self-Assembled Monolayers Induced by Molecularly Thin Ionic Liquid Layers: A Combined Atomic Force Microscopy, X-ray Photoelectron Spectroscopy, and Ultraviolet Photoelectron Spectroscopy Study
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DOI：
10.1021/acs.jpcc.5b05682
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发表时间：
2015-08
影响因子：
3.7
通讯作者：
Y. Yokota;Yoshitada Mino;Y. Kanai;T. Utsunomiya;A. Imanishi;K. Fukui
中科院分区：
文献类型：
--
作者：
Y. Yokota;Yoshitada Mino;Y. Kanai;T. Utsunomiya;A. Imanishi;K. Fukui
二茂铁封端的自组装单分子膜（SAMs）已在过去的四分之一世纪中进行了研究，以确定其电化学性能和微观结构之间的关系，作为一个原型的化学修饰电极。虽然电子结构与电化学性质直接相关，但有关二茂铁封端自组装膜的这种关系的知识非常有限。在这项研究中，我们沉积了少量的离子液体到三种类型的二茂铁封端的自组装膜具有不同的电离能，并进行X射线和紫外光电子能谱，以阐明的电子结构的变化所造成的离子液体的吸附。对于一个低电离能系统，自发氧化的二茂铁部分发生，而它们的电化学活性被保留;对于其他系统，只观察到微小的变化。这一结果表明，离子液体与二茂铁间的相互作用是可逆的。
Ferrocene-terminated self-assembled monolayers (SAMs) have been studied in the last quarter-century to determine the relationship between their electrochemical properties and microscopic structures as a prototypical chemically modified electrode. Although electronic structures are directly related to the electrochemical properties, knowledge of such a relation concerning ferrocene-terminated SAMs is extremely limited. In this study, we deposited a small amount of ionic liquid onto three types of ferrocene-terminated SAMs possessing different ionization energies and performed X-ray and ultraviolet photoelectron spectroscopies to elucidate the changes in the electronic structure resulting from the adsorption of the ionic liquid. For a low-ionization-energy system, spontaneous oxidation of the ferrocene moieties occurred, while their electrochemical activities were retained; for other systems, only minor changes were observed. This result indicates that the interaction between the ionic liquid and ferrocene-...