1. Impedimetric and Electrochemical analysis of Graphene oxide and its applications at different platforms Mahmood. H. Akhtar, K.S. Prasad, M.H. Naveen, D.-M. Kim, Y.-B. Shim Department of Chemistry, Pusan National University, Pusan, South Korea
Abstract: Graphene oxide (GO), which is an allotrope of carbon having 2D crystal structure, has been successfully synthesized with the modified Hummer`s method. UV, FT-IR, TEM and AFM study showed good quality of synthesized material. Due to the valence and conduction bands touch in two independent points called K and K`; graphene acts as zero-band gap semiconductor and has good electrical conductivity merit attention. Even though at zero-level carrier’s density, its conductivity does not vanish linearly. Considering this aspect, we investigated its electrical behavior in terms of impedance. Under different circumstances, it showed more optimized characteristics which have further applicability in sensing.
UV and IR spectra for GO
AFM&TEM images of GO and, ID/IG ratio
of different GO samples
CV’s of GO and GC in 1 mM K3Fe(CN)6
CV’S of different GO modified electrodes in 1 mM
Ru(NH3)6Cl3 and the relationship of anodic peak
current with respect to sonication time
Nyquist diagram for GO, 3GO,6GO,9GO, and
12GO modified GC in 0.1 M KCl containing 2
mM K3Fe(CN)6 / K4Fe(CN)6 .
CV’s for NADH oxidation at GO and 12GO
Conclusions
Tuning of edge plane sites in GO
Maintaining the inherent oxygen functionalities
XPS analysis of all samples showed –C-O-C, -C=O-C, C-C & C-H
Enhanced electrochemical activity
Improved conductivity
Enhanced electrocatalytic activity towards NADH
XPS for GO
Acknowledgment: The authors would like to thank NRF for funding