電気化学界面の減衰全反射型紫外可視分光

<p>The solid-liquid interface forms an electric double layer that enables the functioning of electronic devices and, thus, represents an important area of electrochemical research. As ionic liquids are becoming prominent candidates for new high-performing electrolytes, their interface with solid substrates (e.g., metal electrodes or organic semiconductors) attracts substantial attention. To investigate the buried interface between ionic liquids and substrates, attenuated total reflectance ultraviolet-visible (ATR-UV-Vis) spectroscopy is a powerful method due to its short penetration depth and strong absorbance of materials in the UV and visible regions. Additionally, a newly developed electrochemical setup combined with ATR-UV-Vis (Electrochemical ATR-UV-Vis) has allowed the analysis of the interfacial area under the application of varying electric potential. The application of this new method to ionic liquid/organic semiconductor interfaces achieved simultaneous analysis of the organic semiconductor film and interfacial ionic liquids during transistor operation. In response to the applied gate voltage, the spectral peaks of the organic semiconductor shifted and bleached, correlating with the drain current. The potential dependence of ATR spectra of the ionic liquids on the metal electrode surface was also detected.</p>