The National Metrology Institute of India and A Premier Research Laboratory in the Field of Physical Sciences

Dr. R. K. Kotnala
Chief Scientist
Materials Physics and Engineering
Email address:
Brief Biodata:

Dr. R. K. Kotnala, Fellow, National Academy of Sciences, India,  Asia Pacific Academy of Materials, IGU. 
Dr. R. K. Kotnala, Chief Scientist ( Scientist for last 33 years in NPL ) & Head Materials Physics & Engineering Division , National Physical Laboratory, New Delhi; obtained Ph.D in Solar Cell from IIT Delhi 1982. Specialisation : ISO:17025 & Magnetic Measurements standards, Nano Magnetic Material, Superconductivity,Multiferroics, CMR Materials,DMS,Spintronic Device Physics, Solar Cell ,Humidity Sensor, Hydroelectric Cell.  

Technical/professional engineering accomplishments and brief reflection of scientific excellence:
Pioneering work on ethical issues of Nanotechnology/Nanoscience for scientific community as well. Some of contributions follow as:

Recognition as Materials Scientist Globally :
Published  305 research  papers in prestigious international journals ,  681 citations only in last 10 months besides 6 US/ Indian  patents, + 9 industrial consultancies & support to 112 industries + > 310 invited talks + 4 books and has interacted with  numerous  industries based on ISO:17025. +  Interaction with   Universities & IITs.    
[Published papers in : Angewantde Chemie, Physical Review Letters, Physical Review B, J. Materials Chemistry, Nanoscale, J.Physical Chemistry C, Sensors & Actuators Chem B, Scripta Materials, Appl. Phys. Lett, J. Appl. Phys, RSC Advances, J.Alloys & Compounds. ]
 * A Handbook on Magnetic Materials, Vol. 23,2015 has been published by Elsevier North-Holland Largest scientific publisher of US wherein  I have contributed  a chapter of 91 pages on: FERRITES : Nano-Materials to Spintronics  ( Edited by K H J Buschow )
* Office of Naval Research (ONR), Washington, USA had entrusted in  my work on multiferroics for development of electromagnetic sensor with Italy group and awarded 0.105 million $ US as a contract project in 2011.  
 *Associate Editor for last two years in J.Applied Physics, AIP, NewYork. USA  .

Recent International Session Chairman / Talks ;

  1. International Advisory Committee Member for EMN Croatia Meeting Energy Materials Technology at Dubrovnik, Croatia, May 4-7, 2016.
  2. Keynote Speech in World Congress on Smart Materials WCSM 2016 ( to be delivered in March 2016 ) Singapore.
  3. A Special Invited Talk at Naval Research Laboratory , Washington , May 29,2015
 4. Chairman Program Committee. Global Conference on Materials Science and Engineering (CMSE 2013) to was held in Shanghai, University of Science and Technology in China, during Nov,2013.  
 5. Member, Technical Committee in Asia Pacific Metrology Programme Meeting Nov. 2012 in  New Zealand.
 6. Technical Programme Member  &  Session Chairman   in International Conference   CPEM 2010 ,  S. Korea.
 7. Invited talk on Barium Ferrite Thin Film for Magnetic Memory : 2011 Moscow University.
 8. Invited talk on Multiferroics & its Future Prospects: Catania Univ.2010 Italy.
 9. Invited talk on Atomic Level  Coupling of Magnetic & Electric Dipoles, Materials Research Centre, Darmstadt, 2009  Germany.
National Recognitions:
 1. Guided & Worked for creation of new department of Advanced Materials & Nanoscience in different 5 Universities.  
 2. CSIR-Research initiatives on Nano Sensors & Devices Project Coordinator from 2012.
 3. Disseminating  more awareness of  Ethics in Science, Secretary of SSV, Society for scientific Values, for last 7 years.
 4. Recipient of MRSI Medal Award 2008 in Material Science (Magnetic Materials).
 5. Chairman, committee on Magnetic Materials of Materials Research Society of India (MRSI), Bangalore since 2012. Currently 
 6. Secretary, Society for Scientific Values.
 7. Vice President, Magnetic Society of India since 2008, and
 8. Committee Member, National Mission on Strategic Knowledge for Climate Change due to National Mission  Projects - National SolarMission, Enhanced Energy Efficiency & Clean Coal Technology by Deptt. of Science & Technology, DST ( 2013 Continued ).
 9. Governing Council Member, Electronics & Quality Development Centre (Min. of IT & Communication), Gandhi Nagar and Vadodara ( 2008 - 14).
 10. Court of University, D.C.R. Univ. Sci. & Tech. Murthal, ( 2008-14)
 11. Chairman, committee on Magnetic Materials of Materials Research Society of India   (MRSI), Banglore.
 12. University Grant Commission,UGC, nominee in the Governing Council of G.Pulla Reddy Engineering College (Autonomous)  KURNOOL - 518 002, A.P
 13. Chairman/expert member of different national level committees of DST, CSIR, DRDO, Solar Energy Centre, JNU, IITs, Universities & UPSC.  
 14. Besides academics Dr. Kotnala is a member of Academic Council, BoS of Universities and Court of University/ Governing Council of Technical Universities/Colleges/Institutions. Chaired sessions in international & national Conferences.

Significant Scientific Contributions :

I. Sensor & Hydroelectric Cell :
A highly humidity sensitive oxygen deficient mesoporous magnesium ferrite  has been developed and its conduction mechanism by humidity has been established experimentally & theoretically through isosteric heat of adsorption, binding energy of water molecules estimation  Sensors & Actuators B  171  2012 &  129   2008 . Out of this work a prototype humidity sensor at low cost has been developed. A  US patent US 20150061706 A1.
Based on it Green Energy Cell has been innovated to yield 78 mW power using water only . Lithium- Substituted Magnesium Ferrite as Hydroelectric Cell and Processing Method thereof  by R.K.Kotnala. & Jyoti Shah. Provisional # 792/del/2015

II. Nanoscience & Nanotechnology :
1. Nano Rotor :  For the first time ferromagnetic three dimensional freestanding pillar architecture of multiwall carbon nano tubes has been synthesized and experimentally supported it to act as Nano mechanical rotor and drug delivery carrier.  Angewandte Chemie, 51  2012.
2. Nano Oscillator : Based on Spin Hall Effect of Co/Pt bilayer thin film magnetically anisotropic has been fabricated by  PLD to understand spin pumping of  polarized electrons.  Finally, bilayer is being developed into Nano oscillator to generate higher frequencies.
3.  Nanotechnology for EMI Shielding:  For the first time improved electromagnetic interference shielding response  was established in Poly(aniline)-coated fabrics by substituting dielectric and magnetic Nanoparticles of BaTiO3  (15 nm) or Fe3O4  (40 nm) within coated poly (aniline)(PANI) matrix.   The high value of absorption-dominated SET (97 % attenuation) and specific shielding effectiveness value of 18 dB cm 3 /g demonstrated.
4. Nanomagnetism: Nano Ferrites- Lithium ferrite,Bismuth ferrite,Barium ferrite etc have been designed & developed for microwave applications. Fe -doped PbTiO3  nanoparticles have been synthesized by chemical route using polyvinyl alcohol as a surfactant.  The role of surfactant & nanosize has been analyzed to explain enhancement of magnetization value of Fe doped nanoparticles of lead titnate to 41.6 x 10-3 emu/g.

III. Spintronic Device Materials :
Multiferroic & Diluted Magnetic Semiconductor
1. In multiferroics atomic level evidence  for magnetic and dielectric dipoles coupling has been confirmed experimentally in composite material. At the interface of Bismuth ferrite & Barium Titanate bilayer and trilayer thin films magneto-electric coupling has been induced for the first time.
2. A new multiferroic material   Cr-doped BaTiO3  was synthesized by facile method of metal organic decomposition. Wherein  structural phase transformation from tetragonal to distorted cubic phase  was achieved due to doping to induce magneto electric coupling at atomic level.. Similar results have been obtained in Fe doped BaTiO3 , GdFeO3 and composite thin films.
3. Room temperature ferromagnetism in ZnO Nanorods:  In recent work of stringently controlled experimentation on nanorods of ZnO doped by Li has resulted in room temperature ferromagnetism which has been unequivocally supported with formation of magnetic domains by MFM & other measurements. A comprehensive theory has been formulated based on correlated model for oxygen orbital with random potentials introduced by Li atoms which ultimately inducing local magnetic moments on oxygen atoms  Physical Rev. B, 79, 2009 .
4. High Temperature Superconductivity: Developed a Chemical co-precipitation method to prepare one Kg batch of Yttrium Barium Copper oxide high temperature superconductor.
5. Solar Cell: Solar Cell Fabrication Process:  A process of fabrication of P ± NN +  silicon solar cells by simultaneous diffusion of boron and phosphorous into N-type silicon through a thermally grown silicon dioxide layer of 0.1 micron thick was main Ph.D. work of Dr. Kotnala.  The process is well suited for large scale production of back surface field silicon solar cell.  Moreover this work was published in  “ASSET” United National University publication as-Low Cost Process – Solar Cell in 1981.