Department:IKM - Chemistry of Functional Materials
Position:Post-doctoral Researcher
Address:IFW Dresden
Helmholtzstraße 20
01069 Dresden
Telephone number:+49-351-4659-notset
E-mail:r.n.ummethala(at)ifw-dresden.de



Research Interests

Electrochemical Energy Storage; Carbon Nanostructures; Corrosion Science & Engineering

Ongoing Research

Application of Sulphur-infiltrated 'interwoven and mechanically flexible' Carbon Nanotube (CNT) foams as electronegative electrodes (cathodic current collectors) to enhance energy density in Li ion batteries.

List of Publications

R. Ummethala, D. Wenger, S. F. Tedde, C. Täschner, A. Leonhardt, B. Büchner, J. Eckert, 'Effect of substrate material on the growth and field emission characteristics of large-area carbon nanotube forests', J. Appl. Phys., 119 (4), 044302, 2016.                                                                                                   scitation.aip.org/content/aip/journal/jap/119/4/10.1063/1.4940418

A. B. Minella, D. Pohl, C. Täschner, R. Erni, R. Ummethala, Mark H. Rümmeli, L. Schultz, B. Rellinghaus, 'Silicon carbide embedded in carbon nanofibres: structure and band gap determination', Phys. Chem. Chem. Phys., 16, 24437, 2014.                                                                                                                  http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/c4cp02975e#!divAbstract

D. Leberl, R. Ummethala, A. Leonhardt, B. Hensel, S. F. Tedde, O. Schmidt, O. Hayden, 'Characterization of carbon nanotube field emitters in pulsed operation mode', J. Vac. Sci. Technol. B. 31, 012204, 2013.                                   dx.doi.org/10.1116/1.4773058

R. Ummethala, V. O. Khavrus, A. Leonhardt, B. Büchner, J. Eckert, 'A Comparative Study of Various Supported Catalysts on the Growth of Aligned Carbon Nanotube Forests on Aluminum Foils', Chemical Vapor Deposition 18 (10-12), 326-335, 2012.                                                                                                                            onlinelibrary.wiley.com/doi/10.1002/cvde.201206991/pdf

V.O. Khavrus, M. Weiser, M. Fritsch, R. Ummethala, M. G. Salvaggio, M. Schneider, M. Kusnezoff, A. Leonhardt, 'Application of Carbon Nanotubes Directly Grown on Aluminum Foils as Electric Double Layer Capacitor Electrodes', Chemical Vapor Deposition 18 (1-3) 53-60, 2012.                                                                        onlinelibrary.wiley.com/doi/10.1002/cvde.201106942/pdf

R. Ummethala, F. Despang, M. Gelinsky, B. Basu, 'In vitro corrosion and mineralization of novel Ti-Si-C alloy', Electrochimica Acta. 56 (11), 3809-20, 2011.                                                                                         www.sciencedirect.com/science/article/pii/S001346861100260X

S. Nath, R. Ummethala, B. Basu, 'Fretting wear behavior of calcium phosphate-mullite composites in dry and albumin-containing simulated body fluid conditions', J Mater Sci Mater Med. 21 (4), 1151-61, 2010.                         link.springer.com/article/10.1007%2Fs10856-009-3983-y

 

 

Conferences

Poster: R. Ummethala, D. Leberl, S. Tedde, A. Leonhardt, B. Büchner, J. Eckert, ‘High current density and long term electron emission from optimized and patterned VACNTs for x-ray tomography applications’, NT13, Aalto University, Helsinki, Finland, Jun 2013.

Talk: R. Ummethala, D. Leberl, S. Tedde, A. Leonhardt, H. Zeininger, 'Enhancement of Elctron Field Emission from MWCNTs', InnoCNT Annual Congress, Stuttgart, Germany, Feb 2013.

Poster: R. Ummethala, V. Khavrus, M. G. Salvaggio, A. Leonhardt, ‘Direct growth of vertically aligned carbon nanotubes on aluminium foils over large areas’, NT11, University of Cambridge, Cambridge, UK, Jul 2011.