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Micro pores structured α-Mn2O3 and rGO/α-Mn2O3

V. Govindan, S. Dhatchayani, P. Thavamani, K. Sankaranarayanan*

Department of Physics, Alagappa University, Karaikudi-630003, India

A room temperature co-precipitation method has been used for the preparation of cubic MnCO3 particles by mixing the aqueous solutions of Mn2SO4 and Na2CO3 in 1:2 molar ratios. The prepared light brownish MnCO3 particles were dried and post heated at two temperatures 300ºC and 600ºC with an appropriate time intervals. This time variation facilitates the uniform cubic α-Mn2O3 particles. The as synthesized cubic α-Mn2O3 was further investigated by powder X-ray diffraction studies. The as synthesized MnCO3, Mn2O3 and reduced graphene oxide mixed Mn2O3 particles express the rhombohedral and orthorhombic crystal systems. The molecular vibrations of the titled compounds were obtained from FTIR studies. The morphology and microstructures of the synthesized cubic particles were assessed from scanning electron microscopical studies. The elemental composition was obtained from EDAX analysis. The electro chemical performances were assessed by CV measurement; rGO mixed Mn2O3 has higher sweep voltage than pure one. From the AC impedance calibration the rGO composed Mn2O3 has very low Rct value, due to the addition of conducting rGO in to the Mn2O3 matrix. The obtained reduction in resistance and the porous structure may find applications in the field of sensors.

Key Words: MnCO3, Cubic Mn2O3, Co-precipitation method, Electrochemical analysis.

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