K.A. Padmanabhan

K.A. Padmanabhan and M. Ghanashyam Krishna, faculty members in the School of Engineering Sciences and Technology and Physics, respectively, of University of Hyderabad (UoH), have received United States and European patents for ‘Non-Stoichiometric Titanium Nitride films’ along with Dr. M.S.R.N. Kiran (a former PhD Student of the School of Physics, UoH).

The application for the patents were submitted in 2008, awarded a WIPO number in 2009, European Patent in October 2013 and the US Patent in July 2014. The patent application and process was funded and facilitated by TIFAC a division of the Department of Science and Technology, GoI.


M. Ghanashyam Krishna

The patent deals with a process for the manufacture of transparent, large band gap, high refractive index and high temperature stable non-stoichiometric titanium nitride thin films. These films exhibit different colours such as blue, magenta, brown and golden yellow, which makes them very attractive for decorative applications including artificial jewellery, watches etc. The reflectance of these films in the visible region of the spectrum can be tuned to values close to zero, which can be extremely useful as anti-reflecting coatings. The large band gap of 3.7 to 4.5 eV is expected to make these materials applicable in thin film LEDS used for solid-state lighting. The films can be deposited on a large variety of surfaces (such as glass, quartz, silicon, stainless steel, magnesium oxide and sapphire) that are used in the microelectronic, optical, optoelectronic industries. The films are stable up to 600°C. This permits the use of these coatings in space applications also. The extreme hardness and biocompatibility of these coatings allows medical applications possible. The University is in the process of transferring technology based on this patent to M/s Advanced Process Technology, Ltd., Pune for commercialization.


M.S.R.N. Kiran

Prof. Padmanabhan, a former Director of IIT Kanpur is an eminent world-renowned metallurgist/ materials engineer and is currently a University Chair Professor in the School of Engineering Sciences and Technology, UoH. Prof. M. Ghanashyam Krishna is a PhD from the Indian Institute of Science, Bangalore and has been on the faculty of the School of Physics, UOH since 2001. Dr. M.S.R.N Kiran completed his PhD from the School of Physics, UoH under the joint supervision Profs. Padmanabhan and Krishna and is currently at the Department of Electronic Materials Engineering, Australian National University, Canberra, Australia. The inventors share interests in nanomaterials, thin films and industrial applications of advanced materials.

Dr. Ghanshyam Krishna can be reached on mgksp@uohyd.ac.in