Synthesis of MnO2 on thermally exfoliated graphene by microwave irradiation: a green and eco-friendly approach Hasmukh Gajera * and L. M. Manocha School of Science, GSFC University, Vadodara – 391750, Gujarat, India. E-mail: Hasmukh.gajera@gsfcuniversity.ac.in
Introduction
Experimental
• Graphene: drives numerous application in electronics due to its outstanding physical and chemical properties. Graphene oxide, one of the most important derivatives of graphene, is characterized by a
Characterization studies
layered structure with oxygen functional groups on basal planes and edges. • Benefing from its superior electrical conductivity, electrochemical stability
1. SEM (Scanning Electron Microscopy)
and high specific surface area, graphene is considered as ideal reinforcing component for hybrid and composite by its tailoring properties . • Manganese oxide (MnO2) is a widely used material featuring low-cost, high energy density,
2. TEM (Transmission Electron Microscopy)
environment friendly material for supercapacitor.
3. XRD (X-Ray Diffraction analysis)
• Recently, graphene-metal oxide composites have been investigated as electro for supercapacitors. • The oxygenate groups on the surface of graphene sheet were fount to be the site of anchoring
4. Raman Spectroscopy
manganese ions for subsequent nucleation and growth. With the assistance of microwave heating, redox reactions between carbon and permanganate ions have been employed to deposition of MnO2 on reduced graphene oxide sheets.
Results
SEM
(A,B) As prepared graphene oxide paper and (C,D) exfoliated graphene from graphene oxide paper
XRD patterns of Graphite, as prepared graphene oxide paper and EG230
(Exfoliation of Graphene oxide paper was done at 230oC in ambient condition)
XDR
XRD patterns of as prepared graphene oxide paper and MnO2-graphene
Raman
TEM
G-band D-band
Conclusion • Graphene was synthesized from graphene oxide paper by low temperature exfoliation method and it was carried out at 230oC temperature at ambient condition.
MnO2
• MnO2 was grow on exfoliated graphene using simple microwave treatment. This is one of the
safest and eco-friendly method. • This nano structural composite will be used as a electrode in supercapacitors.
Acknowledgements 1. Thanks to SICART for TEM and XRD analysis of samples. 2. Thanks to The International NanoScience Community:
(E,F) Exfoliated graphene sheets and (G,H) MnO2 on exfoliated graphene in water as a solvent in microwave treatment for 60 sec at 500W.
(a) Raman spectra of exfoliated graphene and (b)Raman spectra of MnO2-graphene composite
Nanopaprika for poster presentation in 7th NANOPOSTER, 2017
7th Virtual Nanotechnology Poster Conference, NANOPOSTER-2017