Layer-by-Layer Films of Graphene and Ionic Liquids for Highly Selective Gas Sensing


  • This work was supported in part by WPI Initiative, MEXT, JST, CREST, and JSPS. The authors thank Dr. Y. Nemoto for high-resolution TEM measurements.


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The best of both worlds: Graphene/ionic liquid (G–IL) layered films were obtained by direct reduction of graphene oxide in the presence of ionic liquids, followed by reassembly through electrostatic layer-by-layer (LbL) adsorption (see picture). The layer spacing of the graphene sheets is regularly expanded upon insertion of ionic liquid molecules (green discs). Selective sensing of aromatic compounds (red spheres) by using the G–IL LbL films was also achieved.