[18p-E302-1~16] 12.2 Characterization and Materials Physics

▼ [18p-E302-11] Photoelectron Spectroscopic Investigation on the Redox-Dependent Electronic and Interfacial Structures in Ferrocene-Terminated Self-Assembled Monolayers

〇(P)Raymond Wong¹, Yasuyuki Yokota¹, Mitsuru Wakisaka², Junji Inukai³, Yousoo Kim¹ (1.RIKEN, 2.Toyama Pref. Univ., 3.Univ. of Yamanashi)

Keywords:Electrochemistry, Solid-liquid interface, photoelectron spectroscopy

The solid-liquid interface is central to electrochemical (EC) processes including electrocatalysis, electrodeposition and corrosion. Here, we utilize ferrocene-terminated alkanethiol self-assembled monolayers (Fc SAMs) as a model EC interface. We investigate the redox-dependent electronic and structural changes utilizing X-ray and ultraviolet photoelectron spectroscopy setup combined with an EC cell (EC-XPS/UPS). EC is performed in a cell is inside a dedicated EC chamber under Ar which can be evacuated, permitting transfer to XPS/UPS. Using this setup, we control the ferrocene/ferrocenium (Fc/Fc⁺) redox state and spectroscopically probe the redox-induced electronic and structural changes. We probe changes to the Fc/Fc⁺ redox center, formation of Fc⁺-anion ion pairs, SAM orientation, monolayer thickness and work function. The approach used here is useful for a wide range of redox-responsive systems to understand structure-behavior relationships.