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 in:Applied surface science 2019-06, Vol.479, p.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: Article
Language:English
Subjects:
Electrochemical effect
Graphene field effect transistor
Interfacial layer
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