Pressure-Temperature Phase Diagram of Ionic Liquid Dielectric DEME-TFSI

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• 作者：Duncan M. McCann^a ; ^d ; ^{D.McCann@ed.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Martin Misek^b ; ^d ; ^{Misek@fzu.cz" class="auth_mail" title="E-mail the corresponding author} ; Konstantin V. Kamenev^c ; ^d ; ^{K.Kamenev@ed.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Andrew D. Huxley^a ; ^d ; ^{A.Huxley@ed.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：DEME-TFSI ; ionic liquid ; pressure ; phase ; glass transition
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：75
• 期：Complete
• 页码：252-258
• 全文大小：460 K

文摘

Ionic liquids have proven highly effective as dielectrics in Electric Double Layer (EDL) devices for electrostatic doping in a range of materials. DEME-TFSI in particular is a commonly used dielectric due to its high ionic conductivity and low glass transition temperature of 182 K. Application of pressure provides a dual tuning parameter in tandem with the electric field yet progress is hampered by the lack of an accurate pressure-temperature phase diagram for DEME- TFSI. We present results on expansivity and leakage current measurements of the ionic liquid dielectric DEME-TFSI to provide a phase diagram mapping the glass transition temperature up to 0.6 GPa. This should allow the effective operation of EDL devices using DEME-TFSI under pressure.