Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 163, Issue -, Pages 236-244Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2015.07.036
Keywords
Nano-structures; Chemical synthesis; Electron microscopy; Fourier transform infrared spectroscopy; Electrical conductivity
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Funding
- SERB, New Delhi [SB/S1/PC-69/2012]
- BRNS, Mumbai [34/14/20/2014-BRNS]
- IASST, Guwahati
- SERB, New Delhi
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Exfoliated graphene were obtained from SDS mediated exfoliation of graphite. The exfoliated graphene (G(exf)-SDS) were further subjected to functionalization to obtain reduced graphene (r-GO), acid chloride functionalized graphene oxide (GO-COCl), ester functionalized graphene oxide (GO-COOR), and amide functionalized graphene oxide (GO-CONH2). The impedance measurements were done on functionalized graphene by a simple layer-by-layer (LbL) assembly technique on silicon wafer substrate using chitosan as cationic binder. Further, the role of lateral dimension of the graphene sheet in a.c conductivity was also studied. It was observed that introduction of bulky groups in the graphene sheets may lead to the band gap opening which is responsible for lower a.c conductivity in case of functionalized graphene. Moreover sheet resistance values were determined for graphene and functionalized graphene. (C) 2015 Elsevier B.V. All rights reserved.
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