Detecting Electric Dipoles Interaction at the Interface of Ferroelectric and Electrolyte Using Graphene Field Effect Transistors

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• 作者：Chunrui MaRongtao Lu ; Guangliang Hu ; Jinsheng Han ; Ming Liu ; Jun LiJudy Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：9
• 期：4
• 页码：4244-4252
• 全文大小：748K
• ISSN：1944-8252

文摘

Graphene was inserted into the interface between electric dipole layers from DEME-TFSI ionic liquid (top-gate) and ferroelectric Pb_0.92La_0.08Zr_0.52Ti_0.48O₃ (PLZT, back-gate) to probe the interface dipole–dipole interaction in response to DC and pulsed gate voltages. A highly complicated behavior of the interface dipole–dipole interaction has been revealed as a combination of electrostatic and electrochemical effects. The interfacial polar molecules in the DEME-TFSI electrical double layer are pinned with assistance from the PLZT back-gate in response to a DC top-gate pump, leading to strong nonlinear electrochemical behavior. In contrast, depinning of these molecules can be facilitated by a faster pulsed top-gate pump, which results in a characteristic linear electrostatic behavior. This result not only sheds light on the dynamic dipole–dipole interactions on the interface between functional materials but also prototypes a unique pump and probe approach using graphene field effect transistors to detect the interface dipole–dipole interaction.