Development of electrochromic devices using single-wall carbon nanotubes in solid state

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In this study, we developed all solid state of electrochromic device using single-wall carbon nanotubes (SWCNTs), and clarified physical mechanisms of electrochromic properties of SWCNTs. Toward solid state devices, it is necessary to change theelectrolyte solution to solid state electrolyte. For that purpose, we prepared ion gel using triblock co-polymers. We fabricated electrochromic devices in all solid states and confirmed electrochromic phenomena using ion gel. To investigate the physical background of electrochromic properties of SWCNTs, we developed a system that can investigate opt-electrochemical measurements at -40 degrees, and then investigaed optical absorption changes by electro-chemical doping at low temperature. We found that optical absorption at ultra-violet region can be also changed by electro-chemical doping, suggesting the presence of π-π^* transition components in the UV-region.