Dr. N. Gopalakrishnan



Dr.N.Gopalakrishnan completed his Ph.D in 1997 at Anna University, Chennai, in the Nucleation and Growth kinetics of III-V Semiconductor. After his Ph.D, he went to Royal Institute of Technology, Sweden for the Post Doctoral research. Later, he had been at Japan for 3 years for Post Doctoral Research at KIT and AIST, Japan. He had been offered prestigious STA (i.e JSPS) fellowship by Japan Science and Technology, Government of Japan for his stay at AIST, Tsukuba, Japan. He had been also at South Korea for one and half years as a Post-Doctoral researcher in Dong-Eui University.

Since March 2018, he is working as Professor of Physics at National Institute of Technology Tiruchirapalli (NIT-T). Earlier, he joined as an Assistant Professor in Sept. 2007 and subsequently promoted to Associate Professor in Sept. 2010. He had been also served as Associate Dean (Academic) in NIT-T from Oct.2012 to Nov.2015 and Head, Department of Physics from Jan.2015-Jan.2018. He bagged Best Professor award in NIT-T during 2020-21.

Dr.N.Gopalakrishnan published around 100 research papers in the International journals and presented about 95 research papers in the National and International conferences. Under his supervision 08 scholars completed Ph.D degree and 51 students completed Master degree projects. Currently, 04 Ph.D scholars and 01 Post-Doctoral Fellow are doing research under his supervision.

Dr.N.Gopalakrishnan has good experience in Growth of III-V and II-VI thin films by versatile techniques, VPE, MBE, PLD and Sputtering. Beside, his group is working in synthesis of oxide nanomaterials, Spintronics, Gas sensing and Water purification. Recently, his group successfully fabricated ZnO p-n junction and CuO, ZnO & β-Ga2O3 based IDE sensor devices.

Beside his Post Doctoral Research in Sweden, Japan and South Korea, he visited United States of America, Germany, Hong Kong, Australia, Germany and Singapore for conferences, scientific discussion, Lab visit and to deliver invited lectures. He has delivered several invited lectures in India as well as in abroad.


Ph.D (Physics) April 1997 Anna University, Chennai, India.
M.Phil (Physics) Sept.1991 Anna University, Chennai, India.
M.Sc (Physics) April.1990 M.K.University, Madurai, India.

Current Position and Administration detail:

Professor # Department of Physics National Institute of Technology Tiruchirappalli-15 Since 12 March 2018 Teaching and Research
Head Department of Physics National Institute of Technology Tiruchirappalli-15 Jan.2015-Jan2018 Teaching, Research and Administration
Associate Dean (Academic) National Institute of Technology Tiruchirappalli-15 Oct. 2012 –Nov.2015 Teaching, Research and Administration

# Best Professor award during 2020-21


Under Graduate:

  • Engineering Physics-I
  • Engineering Physics-II


Post Graduate:

  • Physics and Technology of Thin Film
  • Solid State Physics
  • Electrical, Magnetic, and Optoelectronic Materials
  • Fabrication Technology


Thin films growth (Sputtering / PLD / MBE / HVPE) / Synthesis of oxide nanostructures / Optoelectronics / Spintronics / Gas sensing / Polymer membranes for water filtration.

Research supervision:

Ph.D. Supervision - 08 (completed) 04 (ongoing)

Master degree projects - 51 completed (M.Sc-30 & M.Tech-21) 02 (ongoing)

Post-Doctoral Fellow - 01 (ongoing)

Sponsored Projects ongoing/completed:

1. Doping and Capping in ZnO thin films for spintronics applications. Funding agency- CSIR, Govt. of India (July 2014 – July 2017).

2. Codoping and band gap engineering in ZnO thin films for optoelectronics applications. Funding Agency - DRDO, Govt. of India (Jan. 2009 – Jan. 2012).

No of Ph.D. Completed - (08)

Sl.No Thesis title Student name Year Course
1. Realization of p-ZnO thin films for the fabrication of homojunction by R.F. Magnetron sputtering. Dr.L.Balakrishnan Jan 2013 Ph D
2. Codoping and bandgap engineering in ZnO thin films by R.F. Magnetron sputtering. Dr.S.Gowrishankar Feb 2014 Ph D
3. Hydrothermal synthesis, characterization and fabrication of CuO gas sensors. Dr.S.Bhuvaneshwari July 2017 Ph.D
4. Growth, doping, characterisation and fabrication of ZnO based gas sensors by R.F. magnetron sputtering Dr.E.Vinoth July 2020 Ph.D
5 Effect of Nanofillers (GO, ZnO, GO- ZnO, Ag and Ag-ZnO) incorporated PSF/PVP Membranes for Water Purification Dr.P.Pramila August 2020 Ph.D
6 Doping and Capping in ZnO thin films for spintronics applications by R.F.Magnetron sputtering Dr.N.Sivanantham December 2020 Ph.D
7. Synthesis, Doping, Fabrication and Characterization of ZrO2 nanostructures for gas sensing applications. Dr.E.Hemalatha January 2021 Ph.D
8. Synthesis, Doping and Characterization of β-Ga2O3 for room temperature gas sensing and in-vitro anticancer activities Dr. Rekha Pilliadugula February 2022 Ph.D

No of Post-Doctoral Fellows (01)

Sl.No Research Area Scholar name Year Program
1 Phosphor converted white Light Emitting Diodes (WLEDs) Dr.V.Vasanthi Since Nov.2019 Post-Doctoral

Details of Professional Experiences:

Organization Designation Period From - To Nature of Job
Dept. of Physics National Inst. of Technology Tiruchirapalli-620 015. Professor Since March 2018 Teaching & Research
Dept. of Physics National Inst. of Technology Tiruchirapalli-620 015. Associate Professor Sept.2010- March 2018 Teaching & Research
Dept. of Physics National Inst. of Technology Tiruchirapalli-620 015. Assistant Professor Sept.2007- Sept. 2010 Teaching & Research
Dept. of Physics National Institute of Physics Tiruchirapalli-620 015. CSIR-Scientist May 2006- Sept.2007 Research & Teaching
Electronic Ceramic Centre Dong-Eui University, KOREA Post-Doctoral Fellow June 2004-August 2005 Research
AIST Central-2, Tsukuba, JAPAN. AIST Post-Doctoral Researcher November 2002 - March 2003 Research
AIST Central-2, Tsukuba, JAPAN. STA (JSPS) Fellow October 2000 -October 2002 Research
Kyoto Inst. of Tech (KIT), JAPAN. Post-Doctoral Researcher Oct.1999 – Mar 2000 Research
Royal Inst. of Tech (KTH), SWEDEN. Post-Doctoral Researcher May.1997 – Jun.1998


Other Positions:

Organization Designation Period
Laboratory of Semiconductor Materials
School of Engineering Sciences
KTH-Royal Institute of Technology, SWEDEN
Visiting Fellow 25-31 March 2018
Department of Electronic Materials Engineering, Australian National University (ANU), Canberra, AUSTRALIA. Visiting Fellow 20-28 Feb.2014
Institute of Nanotechnology (INT), Kharlsure Institute of Technology (KIT), GERMANY. Guest Researcher 24 May 2010 - 24 June 2010

Present work at NIT-Tiruchirapalli, India:

  • Teaching for Under Graduate (B.Tech) and Post Graduate (M.Sc/M.Tech) students
  • Research Supervision for Doctoral & Master Students
  • Responsible for Thin film laboratory (Group leader)
  • Developed Thin film laboratory
  • Growth of ZnO thin films by RF Sputtering for LED and Spintronics applications
  • Successfully fabricated p-ZnO
  • Successfully fabricated ZnO p-n junction.
  • Successfully fabricated GMR
  • Synthesis of metal oxide nanostructures (ZnO, CuO, ZrO2 and β-Ga2O3) for Gas sensing
  • Successfully fabricated ZnO- Ag IDE sensors, and β-Ga2O3-Ag IDE Sensors
  • Successfully fabricated flexible CuO IDE sensors on PET substrate
  • Fabrication of nanofillers incorporated polymer membranes (PSF/PVP) for water purification.

Research at Dong-Eui University, South Korea:

  • Thin film growth of ZnO by Pulsed Laser Deposition (PLD) for LED application (GaN, B2O3 and BN doped ZnO in N2O ambient by codoping and triple codoping approach)
  • Characterization of ZnO Thin films (Xrd, AFM, UV-VIS-NIR, PL, GDMS, Hall effect)
  • ZnO Target Preparation for Ablation (Uniaxial press, Cold Isostaic Press, Ball Milling and Sintering)

Research at AIST- Japan:

  • Thin film growth of GaAs on Si by MBE for solar cells application (Growth of GaAs and AlGaAs, Solar cell structures, Thermal Cyclic Annealing, Growth rate check, Flux measurement etc.)
  • Thickness measurement (DEKTAK profiler)
  • Chemical Cleaning of GaAs and Si Substrates
  • Photoluminescence studies (PL), Atomic Force Microscope (AFM)
  • Xrd analysis, in situ RHEED measurement during MBE
  • Optimization of new ULVAC MBE system (MBE system Baking, cell baking )
  • Growth of metals on GaAs

Research Experience at KTH - Sweden & others:

  • Epitaxial growth of InP:Fe by HVPE for Laser Fabrications
  • Hall Measurements of epilayers
  • Reactive ion Etching (RIE), Photolithography
  • Material processing, Fabrication of Mesas & Laser Characterisation
  • Modeling on planar substrates for HVPE:
  • Modeling on patterned substrates for HVPE: Anisotropy behavior of InP, around [110] and [-110] directional etched Mesas (Effect of surface diffusion length and surface diffusion coefficient)



Conference Publications


No. of Post Graduate (M.Sc) Projects Completed (30)

Sl. No PG Project title Name and year Course
1 Ag-doped ZnO thin films for spintronics application by RF sputtering Richa Bharti April 2022 M.Sc
2 Defect related luminescence of Zn doped ZrO2 nanostructures for phosphor converted WLED applications Vaishnavi Verma April 2022 M.Sc
3 Effect of Cr Doping on Room Temperature Gas Sensing Properties of β-Ga2O3 Shyam Narayan Sarkar May 2021 M.Sc
4 Fabrication of Metal Oxide Semiconductor/ Transition Metal Chalcogenides (MOS/TMC) Heterostructure CO2 Sensor by R.F.Magnetron Sputtering. Bikram Mondal June 2020 M.Sc
5 Synthesis and Characterization of SnO2 Nanostructures for Phosphor Converted WLED Prasad. M June 2020 M.Sc
6 Surface modification of R.F.sputtered NiO thin films by Ag and GO for NH3 sensing Kavyakala C May 2019 M.Sc
7 Fabrication of p-ZnO:Ag/n-ZnO homojunction by R.F. Magnetron sputtering. A. Muhil May 2019 M.Sc
8 Synthesis and Characterization of n-Type ZnSe and conversion to p- type by doping Aashna Praveen May 2018 M.Sc
9 Enhancement of Ferromagnetism in Vanadium doped ZnO thin films by Thiol functionalization Shivam Kumar May 2018 M.Sc
10 Synthesis and Characterization of ZnSe by Hydrothermal and Solvothermal Methods. Lakshmi Harikumar May 2017 M.Sc
11 Growth of Cr doped ZnO Thin films by R.F Sputtering and Surface functionalization for Spintronics Application R.Varsha May 2017 M.Sc
12 Enhancement of room temperature ferromagnetism in Mn doped ZnO thin film by RF Magnetron sputtering Shana C P May 2016. M.Sc
13 Synthesis of CuO nanoparticles and CuO- MnO2 Nanocomposite for gas sensing Applications Seethal Pappachan May 2016 M.Sc
14 Effect of Buffer layer thickness for solar cell Applications K.Vivekanandhan May 2015 M.Sc
15 Synthesis of ZnO, CuO Nanostructures and ZnO-CuO Nanocomposites for Gas sensing Applications Naga Karthick K May 2015 M.Sc
16 Fabrication of thin film hetero-junction for solar cell applications Seena Mathew May 2014 M.Sc
17 Magnesium doped Aluminum Nitride for spintronics application Ranjith Kumar.P May 2014 M.Sc
18 Synthesis and characterization of perovskite type lafeo3 multiferroics R.Prasanna perumal May 2013 M.Sc
19 Synthesis of Al doped ZnO for solar cell Applications R.Ramamoorthy May 2013 M.Sc
20 Synthesis of CuO nanorods for gas sensing Applications S.Bhuvaneshwari May 2012 M.Sc
21 Substrate and thickness dependence of ferromagnetism in Mn doped ZnO films grown by RF magnetron sputtering A.Brinda May 2011 M.Sc
22 Fabrication of p-CuO/n-ZnO Hetrojunction for Gas Sensing Applications Arunkumar.B May 2011 M.Sc
23 Role of oxygen vacancies on Zn1-xCrxO thin films grown by RF sputtering M.Suganya May 2010 M.Sc
24 Fabrication and Characterization of OLED Devidas T.R May 2010 M.Sc
25 Effect of Substrate and Thickness on ZnO Thin Films Grown by RF Magnetron Sputtering K.Latha May 2009 M.Sc
26 Fabrication of p-n Junction Using Zinc Oxide by RF Magnetron Sputtering V.Senthamizh Pavai May 2009 M.Sc
27 Growth and characterization of Al doped ZnO (AZO) thin film by R.F. Magnetron sputtering S.Gowrishankar May 2008 M.Sc
28 Structural and optical properties of Al doped ZnO thin films prepared by R.F magnetron Sputtering J.Kabilan May 2008 M.Sc
29 Fabrication of Al doped ZnO (AZO) films by thermal evaporation B.Chandrababu May 2007 M.Sc
30 Growth and characterization of Al doped ZnO (AZO) thin films by thermal evaporation K.Ananth May 2007 M.Sc

No. of Post Graduate (M.Tech) Projects Completed (21)

Sl.No Project title Name and year Course
1 Development of novel ultrasonic waveguide sensor using non-leaky waves for skin temperature measurement Athul Sharma May 2022 M.Tech
Inspection of corrosion under insulation (CUI) using ultrasonic waveguide temperature measurement sensor Akash Sahebrao Tathe May 2022 M.Tech
2 Inspection of corrosion under insulation (CUI) using ultrasonic waveguide temperature measurement sensor Akash Sahebrao Tathe December 2021 M.Tech
Development of novel ultrasonic waveguide sensor with non-leaky waves for multipoint temperature measurement Athul Sharma December 2021 M.Tech
3 Detection of defects in the fabricated tubular joint and their comparative study using RTR Image Intensifier vs Flat Panel Detector Lenka Bhargavi December 2020 M.Tech
Non-Destructive Evaluation of Induction Pressure welded joints using RT Lenka Bhargavi May 2021 M.Tech
4 Reflection study of shear horizontal (sh1) wave modes with plate edge at different incident angles Aravinth. R June 2020 M.Tech
Refelection study of Shear Horizontal wave modes with Bevelled Plate Edges Aravinth. R December 2019 M.Tech
5 Comparison between equipment generated DGS and theoretically drawn DGS. Vignesh K May 2019 M.Tech
Inspection of Longitudinal weld in Pipe and circumferential welds by time of flight diffraction technique (TOFD) Vignesh K December 2018 M.Tech
6 Guided wave ultrasonic testing for the rods of coke oven battery Joydwipkarmakar May 2018 M.Tech
Guided wave ultrasonic testing for the rods of coke oven battery Joydwipkarmakar December 2017 M.Tech
7 Defect Characterisation in Magnesium Alloy (AZ31) plate using Pulsed Thermography. Pramesh Vikram May 2017 M.Tech
Defect Analysis of Butt welded joint of structural Steel (IS-2062), Stainless Steel (SAE-304) and STBW T91 alloy using immersion Ultrasonic Testing. Pramesh Vikram December 2016 M.Tech
8 Development and Validation of UT-RAY Tracing software for flat and curved surface. Rohit Kumar Agrawal May 2017 M.Tech
Effect of Radiographyc Parameters on image quality tools in digital Radiography. Rohit Kumar Agrawal December 2016 M.Tech
9 Defect size measurement using Radiographic technique, A comparison with time of flight diffraction method. Manas Mishra May 2016 M.Tech
Advanced Ultasonic ray trace. Manas Mishra December 2015 M.Tech
10 Electromagnetic Non-Destructive Evaluation of Residual Stress in Shot Peened Low Carbon Steel Subjected to fatigue. Subhash Koner May 2015 M.Tech
Evaluation of Residual Stress and High Cycle Fatigue in Low Carbon Steel through Electromagnetic Non-Destructive Techniques. Subhash Koner December 2014 M.Tech
11 Multi frequency approach for accurate thickness measurement of steam generator tubes at grooves using remote field eddy current technique. Manu Josheph May 2015 M.Tech
Development and Sensitivity Assessment of Multi-frequency Remote field Eddy Current Technique. Manu Josheph May 2014 M.Tech
12 Study of post weld heat treatment effect on magnetic and microstructural behavior of 9Cr-1Mo steel weldment Shaik shahazad May 2014 M.Tech
Modeling of magnetic surface probe using JMAG software and application of magnetic methods for characterization of boiler tubes Shaik shahazad Dec. 2013 M.Tech
13 Characterization of thermal barrier coating speicamen using thermography technique Nidheeshkumar.B May 2013 M.Tech
Characterization of thermal barrier coating specimen using thermography technique Nidheeshkumar.B Dec. 2012 M.Tech
14 Detection and quantification of defects in concrete structures using digital x-ray radiography Sajith S.G. May 2012 M.Tech
15 Detection and quantification of defects in concrete structures using digital x-ray radiography Sajitha S.G. Dec. 2011 M.Tech
16 Deftect detection in concrete blocks using impact –echo technique Chandramouli Patoju May 2011 M.Tech
Defect detection in concrete blocks using impact –echo technique Chandramouli Patoju Dec.2010 M.Tech
17 Transmittance characdteristics and amplification of acoustic emission siganls during tensile deformation of mild steel Shiva krishna L May 2010 M.Tech
Transfer function characteristics of acoustic emission during tensile deformation of mild steel Shiva krishan. L Dec.2009 M.Tech
18 Opitmization of ground penetrating radar system parameters for nondestructive detection of rebars in concrete structures (Phase –I & phase II) Shareef Shaik Dec. 2009 & May 2010 M.Tech
19 Characterisation of solution annealing behaviour of modified 9Cr-1Mo steel by magnetic nde techniques Jagannadham Parikala May 2011 M.Tech
Characterization of microstucture of mod.9Cr-1Mo steell using magnetic Barkhausen emission technique Jagannadham Parikala Dec 2010 M.Tech
20 Higher order guided waves : an optimization study (Phase –I & phase II) Venkataro Burri Dec. 2008 & May 2009 M.Tech
21 Magnetostrictstive sensor for structural health monitoring of plate like structures Jojalah Gundiga May 2009 M.Tech
Generating and detecting guided waves in platet like structures using magnetostrictive sensor Jojalah Gundiga Dec 2008 M.Tech

Contact Address 

Dept. of Physics
National Institute of Technology(NIT)
Tiruchirappalli-620 015.

E.mail: ngk@nitt.edu
Tel: 91-431-2503607
Fax: 91-431-2500133
Mobile: 91- 9894914905