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Assembly of Patterned Graphene Film Aided by Wetting/Nonwetting Surface on Liquid Interface

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3 Author(s)
Zhuo Wang ; Ingram Sch. of Eng., Texas State Univ. - San Marcos, San Marcos, TX, USA ; Xuesong Yang ; Chen, M.Y.

This paper demonstrates a methodology for preparing patterned graphene films through the destabilization of dispersed graphene in N-methyl-pyrrolidone (NMP) by addition of water, which causes the graphene to be trapped at the interface of NMP/hexane. The trapped graphene film is transferred onto the patterned wetting/nonwetting surface through dip-coating process. The quality of graphene film is studied by scanning electron microscopy and atomic force microscopy. The sheet resistance of graphene film is 1.49 × 102 kΩ/□ with surface coverage of 70% measured by the four-probe method. Field effect transistor based on such patterned graphene film is then fabricated. The current on/off ratio of devices is 1.24 with field-effect hole mobility of 159 cm2/Vs.

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Nanotechnology, IEEE Transactions on  (Volume:13 ,  Issue: 3 )