Qualification: 
MSc
Email: 
h_manjunath@blr.amrita. edu
Phone: 
+919845908558

Manjunatha H.  Currently serves as Assistant Professor at department of Physics, Amrita School of Engineering. He is currently pursuing his PhD in the area of Solid polymer electrolytes. Doctoral thesis titled as "Investigations on mixed conducting solid polymer  electrolytes.”

Qualification University  Year
M.Sc

Bangalore University, Bangalore, Karnataka.

2000
M.Phil

Prist University, Thanjavur, Tamil nadu

2010

Publications

Publication Type: Conference Paper

Year of Publication Publication Type Title

2016

Conference Paper

H. Manjunatha, Damle, Rb, and Kumaraswamy, G. N., “Ion beam irradiation as a tool to improve the ionic conductivity in solid polymer electrolyte systems”, in AIP Conference Proceedings, 2016, vol. 1728.[Abstract]


Solid polymer electrolytes (SPEs) have potential applications in solid state electronic and energy devices. The optimum conductivity of SPEs required for such applications is about 10-1-10-3 Scm-1, which is hard to achieve in these systems. It is observed that ionic conductivity of SPEs continuously increase with increasing concentration of inorganic salt in the host polymer. However, there is a critical concentration of the salt beyond which the conductivity of SPEs decreases due to the formation of ion pairs. In the present study, solid polymer thin films based on poly (ethylene oxide) (PEO) complexed with NaBr salt with different concentrations have been prepared and the concentration at which ion pair formation occurs in PEOxNaBr is identified. The microstructure of the SPE with highest ionic conductivity is modified by irradiating it with low energy O+1 ion (100 keV) of different fluencies. It is observed that the ionic conductivity of irradiated SPEs increases by one order in magnitude. The increase in ionic conductivity may be attributed to the enhanced segmental motion of the polymer chains due to radiation induced micro structural modification.

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2014

Conference Paper

H. Manjunatha, Kumaraswamy, G. N., Damle, R., and , “Effect of low energy oxygen ion beam irradiation on ionic conductivity of solid polymer electrolyte”, in AIP Conference Proceedings, 2014.[Abstract]


Over the past three decades, solid polymer electrolytes (SPEs) have drawn significant attention of researchers due to their prospective commercial applications in high energy-density batteries, electrochemical sensors and super-capacitors.The optimum conductivity required for such applications is about 10-2 - 10-4 S/cm, which is hard to achieve in these systems.It is known that the increase in the concentration of salt in the host polymer results in a continuous increase in the ionic conductivity. However, there is a critical concentration of the salt beyond which the conductivity decreases due to formation of ion pairs with no net charge. In the present study, an attempt is made to identify the concentration at which ion pair formation occurs in PEO: RbBr. We have attempted to modify microstructure of the host polymer matrix by low energy ion (Oxygen ion, O+1 with energy 100 keV) irradiation. Ionic conductivity measurements in these systems were carried out using Impedance Spectroscopy before and after irradiation to different fluencies of the oxygen ion. It is observed that the conductivity increases by one order in magnitude. The increase in ionic conductivity may be attributed to the enhanced segmental motion of the polymer chains. The study reveals the importance of ion irradiation as an effective tool to enhance conductivity in SPEs.

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