Speaker
Mr
David Omoefe Idisi
(Department of Physics, College of Science, Engineering and Technology, University of South Africa)
Description
We have synthesized Graphene-Oxide (GO) by the modified hummer’s process and functionalized with gold-nanoparticles (Au-NPs) for the study of microstructure and electrical properties. We have observed from the Raman spectroscopy that the intensity of D-peak (disorder) reduced with respect to G (graphite-cluster) when GO is functionalizes with Au-NPs (r-GO: Au). Reduction of D-peak (increase of G-peak) implies the reduction of ID/IG ratio that are obtained from the Raman spectra. The reduction of ID/IG ratio (GO: 1.17 to rGO-Au: 0.95) clearly indicates that the sp2-cluster is reduced through functionalization of GO with Au-NPs. The reduction of sp2-cluster and/or enhancement of sp3-cluster is due to replacement of sp2-cluster by the Au-NPs. The reduction of sp2-cluster in the film networks are also observed from the Fourier transform infrared (FTIR) spectroscopy and are consistent with reduction of conductivity as we observe from the voltage (V) – Current (I) characteristics measurement curve. We believe that the reduction of conductivity of r-GO:Au would be most suitable Ferro-electric materials for memory storage device applications.
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S. J. Moloi and Sekhar C. Ray
Raysc@unisa.ac.za
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Primary author
Mr
David Omoefe Idisi
(Department of Physics, College of Science, Engineering and Technology, University of South Africa)
Co-authors
Prof.
Ray Sekhar
(Department of Physics, College of Science, Engineering and Technology, University of South Africa)
Dr
Sabata Moloi
(Department of Physics, College of Science, Engineering and Technology, University of South Africa)
Dr
Sweety Sarma
(University of South Africa)
