Dr. Sreekanth J. Varma

Dr. Sreekanth J. Varma is an Assistant Professor in the Department of Physics of the Sanatana Dharma College. His research areas include Organic Electronics (Polymer/Organic Light Emitting Diodes, Photovoltaics and FETs), Nanomaterials and Conducting polymers. He was awarded the prestigious Raman PDF (NanoScience Technology Centre, University of Central Florida) during 2016 and Dr.D.S.Kothari postdoctoral fellowship during 2013. He has research collaborations with many institutions of national status including the Department of Physics, CUSAT, NIT Calicut and IIT Kanpur. He has more than 15 international peer-reviewed journal publications. He is a reviewer for a number of reputed international journals. He is an approved research guide in Physics under the University of Kerala.

PhD thesis entitled “Investigations on polyaniline based systems for technologically important applications and some novel polymers as prospective candidates for fabricating polymer light emitting diodes”

B.Sc. Physics

1. Organic / Inorganic Perovskite Solar Cells / LEDs

2. Organic Electronics (Photovoltaics and LEDs)

3. Conducting Polymers & their applications

4. Nanomaterials

1.Raman PDF – 2016

2.Dr.D.S.Kothari Postdoctoral Fellowship – 2013

1. Yang Liu, Sreekanth J.Varma, et al., “Reflux Pretreatment Mediated Sonication: A New Universal Route to obtain 2D Quantum Dots”, Materials Today (2019) 22, 17-24 (Impact factor: 24.537)

2.Sreekanth J.Varma et al., “Fibre-type Solar Cells, Nanogenerators, Batteries and Supercapacitors for Wearable Applications”, Advanced Science (2018) 1800340 Download (Impact factor: 12.441) (Graphics of this article published as cover page)

3. Cacie Hart, Avra Kundu, Kowsik Kumar, Sreekanth Varma, Jayan Thomas and Swaminathan Rajaraman, “Rapid Nanofabrication of Nanostructured Interdigitated Electrodes (nIDEs) for Long-Term in vitro Analysis of Human Induced Pluripotent Stem Cell Differentiated Cardiomyocytes”, Biosensors 2018, 8(4), 88 Download

4. Sreekanth J.Varma et al, “2D TiS2 Layers: A Superior Nonlinear Optical Limiting Material”, Advanced Optical Materials. (2017) 1700713 (Impact factor: 7.43)(Download)(Published in the Best of Advanced Optical Materials 2017)

5. Sreekanth J. Varma et al, “Enhanced nonlinear optical limiting in TiS2 dichalcogenide 2D Sheets” in Light Manipulating Organic Materials and Devices IV, Proc. of SPIE Vol. 10360, 103600A (2017)

6. Ranjini R.Mohan*, Sreekanth J.Varma* and Jayalekshmi Sankaran, “Impressive electromagnetic shielding effects exhibited by highly ordered, micrometer thick polyaniline films”, Applied Physics Letters, 108, (2016) 154101 (*Equal contribution)

7. Anand P.B, Shijeesh M.R, Sreekanth J. Varma, S. Jayalekshmi, “Exceptionally crystalline and conducting acid doped Polyaniline (PANI) films by level surface assisted solution casting approach”, Applied Physics Letters, 108, (2016) 161901.

8. Vidya G*, Sreekanth J.Varma*, M.V.Mahesh Kumar, S.Prathapan, S.Jayalekshmi and Rani Joseph, “Semiconducting Thienylene – Biphenylenevinylene Hybrid Polymers: Synthesis, Characterization and Application Prospects in Polymer LEDs”, Dyes and Pigments, 126 (2016) 303-312 (*Equal contribution)

9. Ranjini R.Mohan, Sreekanth J.Varma, Muhammad Faisal and Jayalekshmi S, “Polyaniline/graphene hybrid film as an effective broadband electromagnetic shield”, RSC Advances, 5 (2015) 5917-5923

10. M. Sajimol Augustine, P.P Jeeju, S.J Varma, P.A Francis Xavier, S. Jayalekshmi, “Enhanced photoluminescence in transparent thin films of polyaniline-zinc oxide nanocomposite prepared from oleic acid modified zinc oxide nanoparticles”, Thin solid Films, 562 (2014) 84-89

11. Sreekanth J.Varma, Ranjini R.Mohan, Vidya G, S.Jayalekshmi, S.Prathapan, “Effect of Solvents on the Photoluminescence Emission of a Few Novel, Light Emitting, Segmented Block Copolymers and Hybrid Polymers”, AIP Conference Proceedings, 1576 (2014) 171-175

12. S.J.Varma, Jerin George, Jeeju.P.P, S.Jayalekshmi, “Quantum confinement effects in highly conducting, ultrathin Polyaniline films pursued through spectroscopic investigations”, Journal of Luminescence, 132 (2012) 801-805

13. S.J.Varma, Francis Xavier P.A, Soney Varghese and S.Jayalekshmi, “Synthesis and studies on exceptionally crystalline polyaniline thin films”, Polymer International, 61, (2012) 743–748

14. S.J.Varma, S.Jayalekshmi, “On the prospects of Polyaniline and Polyaniline/MWNT Composites for possible pressure sensing applications”, Journal of Applied Polymer Science, 117 (2010) 138–142

15. Pullarkat P Jeeju, Augustine M Sajimol, Vallath G Sreevalsa, Sreekanth J Varma and S.Jayalekshmi, “Size-dependent optical properties of transparent, spin-coated polystyrene/ZnO nanocomposite films”, Polymer International, 60 (2011) 1263–1268

16. P.P.Jeeju, S. J.Varma, P.A.Francis Xavier, A.M.Sajimol, S.Jayalekshmi, “Novel Polypyrrole films with excellent crystallinity and good thermal stability”, Materials Chemistry and Physics, 134, (2012) 803-808

17. M.Sajimol Augustine, S.J. Varma, P.A. Francis Xavier and S. Jayalekshmi, “Enhanced photoluminescence in oleic acid modified polyaniline”, Transactions of the Indian Institute of Metals, 64 (2011) 209-212

18. M.Amrithesh, K.P.Chandni, S.Jayalekshmi, Febin Kurian, S.J.Varma, On the interesting optical transitions observed in polyaniline films in the conducting and insulating states, Optoelectronics and Advanced Materials – Rapid Communications, Vol.3, No. 2, February 2009, 149 – 154

19. Sreekanth J.Varma, S.Jayalekshmi, “Carbon Nanotube – Polymer Nanocomposites for Possible Pressure Sensor Applications” Proc. of SPIE Vol. 7037, 703716, (2008)

1. Ranjini R Mohan, Sreekanth J Varma, S.Jayalekshmi, “Effective electromagnetic shield using conductive polyaniline films”, Proc. of International Conference on Materials for Energy and Environment (ICMEE 2018) Chennai, 2018

2. Avra Kundu, Sreekanth Varma, Jayan Thomas, Swaminathan Rajaraman, “Plasmonic Interdigitated Electrodes (Pides) For In Vitro Analysis of Cells”, Proc. of 21st International Conference on Miniaturized Systems for Chemistry and Life Sciences October 22-26, 2017, Savannah, Georgia, USA

3. Sreekanth J.Varma, “Wearable Technologies”, NanoFest Florida 2017, 28 January 2017, Orlando, Florida, USA

4. Ranjini R Mohan, Shijeesh MR, Sreekanth J Varma, S.Jayalekshmi, “Carrier-mobility and carrier-concentration studies in semiconducting polymers and hybrids for OFET applications”, Proc. of the Space-Mate Symposium (SMS 2017), 21 December 2017, S.D.College, Alappuzha

5. Praveen P, Arjun B and Sreekanth J.Varma, “Conducting polymer composite based materials for pressure sensing applications”, National Seminar on Material Science with Special Emphasis on Crystallography, 9-11 September 2015, Govt. College, Nattakam

6. Ranjini R.Mohan and Sreekanth J.Varma, “Non-linear optical properties of highly conducting polyaniline films prepared via self-stabilized dispersion polymerization”, Proc. of the National Seminar on Nanochemistry – Techniques, Advancement and Applications, 16th October 2015, Alappuzha

7. Muhammad Faisal and Sreekanth J. Varma, “Fly Ash Incorporated Polyaniline as a High Performance Shield against Electromagnetic Pollution”, Proc. of IC-EEE2015, 4-7th February 2015, Kochi

8. Muhammad Faisal and Sreekanth J. Varma, “X-band electromagnetic interference shielding of polyaniline/barium ferrite composites”, Proc. of the 27th Kerala Science Congress, 27-29 Jan 2015, Alappuzha

9. Sreekanth J.Varma, Ranjini R.Mohan, Vidya G, S.Jayalekshmi, S.Prathapan, “Effect of Solvents on the Photoluminescence Emission of a Few Novel, Light Emitting, Segmented Block Copolymers and Hybrid Polymers”, The 2nd International conference on Optoelectronic Materials and Thin films for Advanced Technology (OMTAT 2013), 3rd-5th January, 2013, Kochi, India

10. S.J.Varma, Francis Xavier and S. Jayalekshmi, “An investigation on the high temperature response of highly conducting polyaniline films” Proc. International conference on Advances in Polymer Technology, Feb. 26-27, 2010, India, Page No. 119

11. S.J.Varma, et al., “A quest for quantum confinement in highly conducting polyaniline thin films through spectroscopic investigations”, Proc. International conference ICMST held during October 2010 at Thiruvananthapuram

12. S.J.Varma, S.Jayalekshmi, Proc. International Conference on “Material Science Research and Nanotechnology (ICMSRN 2008)”, 27-29th February 2008, Kodaikanal, Tamilnadu, India, 46, P 153

13. Sreekanth.J.Varma, Rani Joseph, Honey John, Mani.T.K; PP 17, Proc. National Conference “New Horizons in Theoretical & Experimental Physics (NHTEP 2007)”, October 8-10 (2007), Cochin, India

14. Sreekanth J.Varma, Ranjini R.Mohan, Manoj.M, “Crystallinity in highly conducting PANI films, synthesized by dispersion polymerization”, Proc.Current Trends in the Fields of Nano Science and Nanotechnology, 13th-14th December 2012, K.K.T.M Govt. College, Kodungallur, Kerala, India

15. Muhammad Faisal, Sreekanth J Varma, KC Sajjan, and Syed Khasim, “Polyaniline-Stannous Oxide Composites for EMI Shielding and Humidity Sensing Applications”, Proc. of International Union of Materials Research Societies – International Conference in Asia-2013 (IUMRS-ICA-2013) December

16-20, 2013, IISC, Bangalore16. Muhammad Faisal, Ranjini R. Mohan, Sreekanth J. Varma, KC Sajjan, and Syed Khasim, “Polyaniline-yttrium oxide composites for humidity sensing and microwave shielding/absorbing applications”, 26th Kerala Science Congress, 28-31 January 2014, Wayanad (Accepted)

17. Muhammad Faisal, Sreekanth J. Varma, KC Sajjan and Syed Khasim, “Polyaniline-Antimony Oxide Composites for EMI Shielding and Pressure Sensing Applications”, Proc. International Conference on Advanced Polymeric Materials (ICAPM 2013), P27, pp 191-192, 2013

18. K.C.Sajjan, Munammad Faisal, Sreekanth J. Varma, Syed Khasim, “EMW Absorbing Properties of Polyaniline-Chromium Oxide Composites”, Proc. International Conference on Advanced Polymeric Materials (ICAPM 2013), SIL 56, pp 112, 2013

19. Jubeesh M.K, Ranjini R. Mohan, Sreekanth J.Varma, “Nanostructured polyaniline as a prospective candidate for pressure sensing applications”, Proc.Current Trends in the Fields of Nano Science and Nanotechnology, 13th-14th December 2012, K.K.T.M Govt. College, Kodungallur, Kerala, India

20. P.B. Anand, Sreekanth J. Varma, S. Jayalekshmi, Structural and electrical characterization of exceptionally crystalline CSA, NSA doped polyaniline thin films, Proc. Fifth International Conference on “ Electroactive Polymers: Materials and Devices”, Nov. 4-9, 2012, Banaras Hindu University, Varanasi, India

21. Francis Xavier, Amrithesh.M, S.J.Varma, Jeeju P. P and S. Jayalekshmi, “Studies on Polyaniline – functionalised carbon nanotube composite films with exceptional high dc electrical conductivity, Proc. International symposium for research scholars on metallurgy, material science and engineering (ISRS 2010), December 20-22, 2010, ELPM-5, Page No. 199

22. Francis Xavier, S.J.Varma, and S. Jayalekshmi, “An investigation on the high temperature response of H3PO4 doped PANI and PANI-MWNT composites”, Proc. International conference on Advances in Polymer Technology, Feb. 26-27, 2010, India, Page No. 115

23. Francis Xavier P. A, Bobins Augustine, S. J. Varma, Jeeju P. P, Amrithesh.M and S. Jayalekshmi, Functionalization of Multiwalled Carbon Nanotubes as a route to synthesize highly conducting Polymer-Nanocomposites” was presented in the international conference ICMST held during October 2010 at Thiruvananthapuram, HPS05, pp 8.34

24. Sajimol Augustine.M, S.J.Varma, Francis Xavier and S. Jayalekshmi, Enhanced photoluminescence behaviour of PANI/ZnO nanocomposite prepared from oleic acid capped ZnO nanoparticles” was presented in the international conference ICMST held during October 2010 at Thiruvananthapuram

25. Jeeju P. P, S J. Varma, Francis Xavier P.A, S.Jayalekshmi, “Polypyrrole films with excellent crystallinity and good thermal stability”, was presented in the international conference ICMST held during October 2010 at Thiruvananthapuram

26. Sajimol Augustine.M, S.J.Varma, Francis Xavier and S. Jayalekshmi, “Enhanced photoluminescence in oleic acid modified Polyaniline”, Proc. International conference ‘ISRS 2010’, IITM, Chennai

27. Jeeju.P.P, Sreekanth.J.Varma, Amrithesh.M, S.Jayalekshmi, “Polypyrrole nanorods with appreciable crystallanity and good optical absorption characteristics”, Second International Conference on frontiers in Nanoscience & Nanotechnology: Cochin Nano- 2009, page 144

28. R.Mohan, Srikanth Naik, M. Rao, S.J.Varma, A. M Shanmugharaj, Soney Varghese, Preparation and Characterization of Ferroelectric Polymer-Ceramic Nanocomposites for Non-volatile Memory Applications, Proc. International conference on Advances in Polymer Technology, Feb. 26-27, 2010, India, Page No. 330

“Organic Electronics: In the Perspective of Sensors and Optoelectronic Devices”, in Recent Trends in MEMS Sensors and Devices on the 11th of October 2013 as part of Continuing Education Programme of DRDO at Naval Physical and Oceanographic Laboratory (NPOL)• “Spin coating technology”, in a workshop on Virtual Instrumentation and Advanced Experimental techniques on the 12th of November 2013 at Government College, Nattakam, Kottayam• “Graphene as a Prospective Material for Organic Photovoltaic Applications”, in the National Seminar on Recent Trends in Supramolecular Assembly and Nanomaterialsduring the 11thand 12th of December 2013 at MSM College, Kayamkulam• “Polymer Research: The evolution from passive insulation to active light emission”, in the National seminar on Current Trends in Material Science during the 13th and 14th of August 2014 at Aquinas College, Edakochi

Minor Project entitled “Development of highly crystalline conducting polymers and polymer nanocomposites for electromagnetic shielding applications” funded by University Grants Commission – Rs.5 lakhs”Project Report”

Convener, Research Assessment Committee, S.D.College, Alappuzha (2014-16)• Coordinator – SARD, Department of Physics• Member – DST FIST Project Implementation Group• National Advisory Committee Member, International Conference on Energy Harvesting Storage and Conversion, CUSAT (2015)• Mentor, ‘Walk-with-a-Scholar’ (Govt. of Kerala),S.D.College, Alappuzha (2014-16)• Co-ordinator – One-day Seminar “Celebrating the Centenary of Bohr Atom Model” organised by APT, Kerala in collaboration with the Dept. of Physics, S.D.CollegeProfessional Associations• Reviewer for the international peer-reviewed journals like Applied Physics Letters, Journal of Materials Chemistry C, Polymer Chemistry, RSC Advances, Polymer International, Journal of Frontiers in Environmental Engineering (FIEE), International Journal of Chemistry and Material Science (IJCMS)and Iranian Polymer Journal• SPIE student member during 2008-09

1. Manju V.

2. Aruna Raj