Probing the relationship of cations-graphene interaction strength with self-organization behaviors of the anions at the interface between graphene and ionic liquids

The influence of molecular cations on the dynamic self-organization of anion at the interface between graphene and ionic liquid (IL) is investigated by selecting same anion ILs (N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI) and 1-butyl-1-methylpyrrolid...

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Bibliographic Details
Published inApplied surface science Vol. 479; pp. 576 - 581
Main Authors Hu, Guangliang, Anaredy, Radhika S., Alamri, Mohammed, Liu, Qingfeng, Pandey, Gaind P., Ma, Chunrui, Liu, Ming, Shaw, Scott K., Li, Jun, Wu, Judy Z.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.06.2019
Subjects
Electrochemical effect
Graphene field effect transistor
Interfacial layer
Ionic liquid
Interfacial layer
Graphene field effect transistor
Electrochemical effect
Ionic liquid
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Summary:The influence of molecular cations on the dynamic self-organization of anion at the interface between graphene and ionic liquid (IL) is investigated by selecting same anion ILs (N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMP-TFSI)) as the top gate of double-gate graphene filed effect transistors (DG-GFETs). The selected ILs have similar viscosity and conductivity but exhibit distinctly different effects on device performance. From electric transport properties of the DG-GFETs and infrared spectroscopy, it is found that stronger BMP-graphene interactions facilitate faster self-organization of the TFSI anions on graphene. The results introduce an important role of the interfacial cation-graphene interactions that contribute to molecular self-organization, and clearly show the significant impact interfacial effects offer for tuning macroscopic device performance. [Display omitted] •The interfacial electrochemical effect between ILs and graphene in BMP-TFSI DG-GFET is stronger than that in DEME-TFSI DG-GFET•The self-organization process of TFSI anion is faster in the BMP-TFSI/graphene interface than in DEME-TFSI/graphene interface after both light illumination and rotation•The stronger interfacial electrochemical effect between ILs and graphene in BMP-TFSI DG-GFET is duo to the stronger interaction between the cation and graphene
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2019.02.070