Dr. Ajay Soni

Dr. Ajay Soni
Phone: +91-1905-267154
EMail: ajay[at]iitmandi[dot]ac[dot]in
School of Basic Sciences,
Indian Institute of Technology Mandi,
Academic Block A4, Office #309, Kamand Campus - 175001
Himachal Pradesh, India

Research Interests

  • Experimental Condensed Matter Physics
  • 2D Nanomaterials for Future Energy
  • Mesoscopic Physics and Nano-functional Devices
  • Thermoelectric and Optoelectronic Materials
  • Researcher ID: E-1488-2011
  • Professional Experience

    Education

    • Ph. D. (Physics) UGC-DAE Consortium for Scientific Research, Indore (MP), 2004-2009.
      Thesis title: “Study of Physical Properties of Nanomaterials”,
    • M. Sc. Physics, M. L. S. University, Udaipur, (Raj.), India, 1999-2001
    • B. Sc., M. L. S. University, Udaipur, (Raj.), India, 1996-1999

    Achievements

    • UGC-CSIR National Eligibility Test, India (June 2002)
    • Position in M. L. S. University merit for M.Sc. (Physics) 2001

    Teaching

    • August-November 2013 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2014 : PH-501 Solid State Physics, for B.Tech/MS/PhD students
    • February-June 2014 : IC-201P Engineering Design Practicum, for B.Tech students (Group 7 and 14)
    • August-November 2014 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2015 : PH-601 Mesoscopic Physics and Quantum Transport, for PhD students
    • February-June 2015 : IC-201P Engineering Design Practicum, for B.Tech students (Group 6 and 15)
    • August-December 2015 : PH-415P Electronics Laboratory Practicum, for I-PhD (Physics) students
    • February-June 2016 : PH-523 Condensed Matter Physics, for I-PhD (Physics) students
    • August-November 2016 : IC-222P Physics Practicum, for B. Tech students
    • February-June 2017 : PH-601 Mesoscopic Physics and Quantum Transport, for PhD students
    • August-December2017 : PH-513 Quantum Mechanics, for B. Tech, M. Sc. and i-PhD (Physics) students
    • February-June 2018 : (Coordinator) PH-526 Research Project III for I-PhD (Physics) students
    • February-June 2018 : (Coordinator) PH-622 Mini Thesis- II for I-PhD (Physics) students
    • February-June 2018 : IC-201P Engineering Design Practicum, for B.Tech students (Group 12)
    • August-December2018 : PH-513 Quantum Mechanics, for B. Tech, M. Sc. and i-PhD (Physics) students
    • August-December2018 : PH-601 Mesoscopic Physics and Quantum Transport, for MSc, i-PhD and PhD (Physics) students
    • February-June 2019 : IC-222P Physics Practicum, for B. Tech students

    Group Members

    • Doctoral Students:
    • (1) Somnath (2013-18)
    • (2) Juhi (2015-20)
    • (3) Niraj (2016-20) (DST-SERB)
    • Alumni Docotral Students:
    • (1) Dr. Mahesh (2014-18) : Post Doctoral Fellow at University of Glasgow, UK
    • Masters Students:
    • (1) Ankit (2017-19): M. Sc. Chemistry Batch 2017
    • (2) Aditya Prasun(2018-20): M. Sc. Chemistry Batch 2018
    • Alumni
    • (1) Priya, Summer Intern from Sri sai University, Palampur, Himachal pradesh (June-July 2017).
    • (2) Anjali, Summer Intern from Sant Longowal Institute of Engineering and Technology, Punjab (June-July 2017).
    • (3) Cleir Mathew, Summer Intern from Univeristy of Liverpool, United Kingdom (June-July 2016).
    • (4) Mani Mohan, Summer Intern from IISER, Bhopal, (June-July 2015 and 2016).
    • (5) Savin, PhD student at Univeristy of New Mexico, United States (Aug 2015-March 2016).
    • (6) Nitika, M.Tech. Intern students from University of Rajasthan, Jaipur, (August 2014-January 2015).
    • For internships: Institute invites applications for internship. Keep an eye on the timely advertisements.
    • Students interested to work in the exciting field of Experimental Condesnsed Matter Physics, Nanoscience & Nanotechnology are welcome to join Indian Institute of Technology Mandi For ADMISSIONS

    Research Facilities

    • Facility for bulk materials synthesis by melt grown method,
    • Facility for solution growth for metallic nanomaterials and semiconducting quantum dots,
    • Temperature dependent Seebeck coefficient and Restisvity Measurements Set-up (80-600 K): Suported by DAE:BRNS-YSRA 2015-18,
    • Central Research Facility at IIT Mandi Research Facility

    Projects and Awards

    • Bhaskara Advanced Solar Energy (BASE) Research Fellowship 2018 by Indo-US Science and Technology Forum and Department of Science and Technology India. Visiting Rensselaer Polytechnic Institute, Troy .
    • DRDO Extramural Research Grant, India; as Co-PI with Dr. Satinder Sharma (PI)
  • DAE Young Scientist Research Award by Board of Research in Nuclear Sciences, India; Total Grant: INR 26,00,000.
  • DST-SERB Young Scientist Start Up Grant, by Science and Engineering Research Board (SERB), Delhi, India; Total Grant: INR 26,06,000.
  • Institute seed grant for new faculty by IIT Mandi; Total Grant: INR 17,70,000.

Professional Activity

  • Reviewer for Journal of Americal Chemical Society, Nature Scientific Reports, Applied Surface Science, Journal of Materials Chemistry (A,C), Chemical Physics Letters, RSC Advances, Nano Energy, Nanoscale, Journal of Physical Chemistry, Applied Optics, Journal of Physics and Physical Chemistry and Carbon,
  • Guest Editor (Journal of Nanomaterials), Special Issue on Nanomaterial Synthesis, Characterization and Applications

Publications

  1. Rare Earth Doping and Effective Band-Convergence in SnTe for Improved Thermoelectric Performance,
    Somnath Acharya, Dibyendu Dey, Tulika Maitra, Ajay Soni and Arghya Taraphder
    Applied Physics Letters 113, 193904 (2018) , arXiv:1811.04389
  2. Enhancement of Power Factor for Inherently Poor Thermal Conductor Ag8GeSe6 by Replacing Ge with Sn,
    Somnath Acharya, Juhi Pandey and Ajay Soni
    ACS Applied Energy Materials Accepted(2018) ,
  3. Effect of ion-implantation-induced defects and Mg dopants on thermoelectric properties of ScN,
    Nina Tureson, Marc Marteau, Thierry Cabioch, Ngo Van Nong, Jens Jensen, Jun Lu, Daniele Fournier, Niraj Singh, Ajay Soni , Laurent Belliard, Per Eklund, Arnaud le Febvrier
    Physics Review B 98, 205307(2018) , arXiv:1809.09027
  4. Melt spinning: A rapid and cost effective approach over ball milling for the production of nanostructured p-type Si80Ge20 with enhanced thermoelectric properties,
    Riya Thomas, Ashok Rao, Nagendra S. Chauhan, Avinash Vishwakarma, Niraj Kumar Singh and Ajay Soni
    Journal of Alloys and Compounds Accepted (2018),
  5. Unraveling Biexciton and Excitonic Excited States from Defect Bound States in Monolayer MoS2,
    Juhi Pandey and Ajay Soni,
    Applied Surface Science 463, 52 (2019) ,
  6. Interface properties probed by active THz surface emission in Graphene/SiO2/Si heterostructures,
    Zehan Yao, Lipeng Zhu, Yuanyuan Huang, Longhui Zhang, Wanyi Du, Zhen Lei, Ajay Soni and Xin Long Xu
    ACS Applied Materials and Interfaces 10 (41), 35599 (2018).
  7. Coupling of Charge Carriers with Magnetic Entropy for Power Factor Enhancement in Mn Doped Sn1.03Te for Thermoelectric Applications,
    Somnath Acharya, Sharmistha Anwar, Takao Mori and Ajay Soni
    Journal of Materials Chemistry C 6, 6489 (2018).
  8. Integration of Graphene Oxide Buffer Layer/Graphene Floating Gate for Wide Memory Window in Pt/Ti/Al2O3/GO/graphene/SiO2/p-Si/Au Non-Volatile (FLASH) Applications,
    Mahesh Soni, Ajay Soni, S. K. Sharma
    Applied Physics Letters 112, 252102 (2018).
  9. Charge Carriers Modulation and Thermoelectric Performance of Intrinsically p-Type Bi2Te3 by Ge Doping,
    Niraj Singh, Juhi Pandey, Somnath Acharya and Ajay Soni,
    Journal of Alloys and Compounds 746, 350 (2018) ,
  10. Scalable and site specific functionalization of reduced graphene oxide for circuit elements and flexible electronics,
    Mahesh Soni, Pawan Kumar, Juhi Pandey, Satinder K. Sharma and Ajay Soni,
    Carbon 128, 172 (2018) ,
  11. Nitrogen doped multilayer photo catalytically reduced graphene oxide floating gate: Al/PMMA/NrGO/SiO2/p–Si/Au based hybrid gate stack for non volatile memory applications,
    Mahesh Soni, Ajay Soni, S. K. Sharma
    Organic Electronics 51, 48-53, (2017) ,
  12. Reduction of the thermal conductivity of the thermoelectric material ScN by Nb alloying,
    Nina Tureson, Ngo Van Nong, Daniele Fournier, Niraj Singh, Somnath Acharya, Susann Schmidt, Laurent Belliard, Ajay Soni, Arnaud le Febvrier, and Per Eklund,
    Journal of Applied Physics 122, 025116 (2017) ,
  13. Enhanced thermoelectric properties of Yb doped SnTe,
    Somnath Acharya and Ajay Soni
    AIP Conference Proceedings 1832, 110028 (2017).
  14. Photo-catalytic reduction of oxygenated graphene dispersions for supercapacitor applications,
    Mahesh Soni, Pawan Kumar, Rudra Kumar, S. K. Sharma Ajay Soni,
    Journal of Physics D: Applied Physics 50, 124003, (2017) ,
  15. Selective Detection of F— Using Al Microarrays Integrated Graphene Oxide,
    Mahesh Soni, Pawan Kumar, Ajay Soni and S. K. Sharma,
    Sensors and Actuators B: Chemical, 247, 224 (2017).
  16. Soft phonon modes driven reduced thermal conductivity in self-compensated Sn1.03Te with Mn doping,
    Somnath Acharya, Juhi Pandey and Ajay Soni
    Applied Physics Letters 109, 133904 (2016).
  17. Integration of Highly Sensitive Oxygenated Graphene With Aluminum Micro-Interdigitated Electrode Array Based Molecular Sensor for Detection of Aqueous Fluoride Anions,
    Mahesh Soni, Tarun Arora, Robin Khosla, Pawan Kumar, Ajay Soni and S. K. Sharma,
    IEEE Sensors Journal 16 (6) 1524 (2016) ,
  18. Nanomaterial Synthesis, Characterization, and Application: Editorial
    Mahmood Ghoranneviss, Ajay Soni, Alireza Talebitaher and Necdet Aslan,
    Journal of Nanomaterials, 892542 (2015)
  19. Dual Gate Tunable and High Responsivity Graphene-Based Field Effect Transistors,
    Mahesh Soni, S. K. Sharma, and Ajay Soni
    Macromolecular Symposia, Soft Materials, 357 (1) 12 (2015) ,
    Before Joining IIT Mandi
  20. Interface driven thermoelectric power of spark plasma sintered nanoplatelet composites of Bi2Te2.7Se0.3,
    Ajay Soni, S. Yiqiang, Y. Ming, Z. Yanyuan, Y. Ligen, H. Xiao, Z. Dong, M. K. K. Aik, M. S. Dresselhaus and Xiong Qihua,
    Nano Letters 12 (8) 4305 (2012)
  21. Enhanced Thermoelectric Properties of Solution Grown Bi2Te3-xSex Nanoplatelet Composites,
    Ajay Soni, Y. Zhao, Y. Ligen, M. K. K. Aik, M. S. Dresselhaus and Xiong Qihua,
    Nano Letters 12(3), 1203 (2012)
  22. Effect of Co-doping on the resistivity and thermopower of SmFe1-xCoxAsO (0.0=x=0.3),
    G. S. Okram, N. Kaurav, Ajay Soni, A. Pal, and V. P. S. Awana,
    AIP Advances 2, 042137 (2012)
  23. Raman Spectroscopy of Few-Quintuple Layer Topological Insulator Bi2Se3 Nanoplatelets,
    Z. Jun, P. Zeping, Ajay Soni, P. Bo, Y. Zhao, J. Wang, M. S. Dresselhaus, and Q. Xiong,
    Nano Letters 11 (6), 2407–2414 (2011).
  24. Magneto-resistance, thermal conductivity, thermo-electric power and specific heat of superconductor Gd0.95Pr0.05Ba2Cu2.94M0.06O(7-d) (M=Fe, Ni, Zn and Mn),
    T. Chakraborty, B. Gahtori, Ajay Soni, G. S. Okram, S. K. Agrawal, S. Y. Chen, Y. K. Kuo, M. A. H. Ahsan, Ashok Rao,
    Solid State Communications, 151(17), 1117-1121 (2011).
  25. High Coercive Field and Magnetization Reversal in Core-shell Cum Nanotwin Driven Ni/NiO Nanospheres,
    G. S. Okram, Ajay Soni, D. T. Adroja, N. P. Lalla, and T. Shripathi J. Nanosci. Nanotechnol. 11, 2632-2635 (2011).
  26. The pH-controlled particle size tuning of nanocrystalline Ni in polyol synthesis method without additional cappant,
    G. S. Okram, Ajay Soni and R. Prasad, Adv. Sci. Lett., 4, 132–135 (2011).
  27. Electrical and thermal properties of bulk superconductors Eu0.95Pr0.05Ba2(Cu1-xMx)3O7-? (M=Fe, Ni, Zn and Mn), 
    T. Chakraborty, B. Gahtori, Ajay Soni, G. S. Okram, S. K. Agarwal, Y.-S. Chen, Y.-K. Kuo, Geetha, A. Rao, C. K. Sarkar,
    Physica C: Superconductivity, 470, 244 (2010).
  28. Negative thermopower of over doped Bi2Sr2CaCu2O8 superconductor, J. K. Bains, M. Mudgel,
    G. S. Okram, Ajay Soni, V. P. S. Awana, P. K. Ahluwalia, R. B. Saxena, H. Kishan, Physica C: Superconductivity, 470, S203 (2010).
  29. The unusual electrical response in polyaniline - threonine composites,
    T. Mathavan, S. Umapathy, M.A. Jothirajan, M. Fatima Parveen, T.S. Vivekanandam, Ajay Soni, G. S. Okram, V. Ganesan,
    Materials Letters 64, 2009 (2010).
  30. Effect of Mn substitution on the thermo-power of the superconductor Mg1-xMnxB2,
    A. Rao, T. Chakraborty, B. Gahtori, C. Sarkar, S. K. Agarwal, Ajay Soni, G. S. Okram, Journal of Physics: Conference Series 234, 012033 (2010).
  31. Size dependent thermopower in nanocrystalline nickel, Ajay Soni and G. S. Okram,
    Appl. Phys. Lett. 95, 013101 (2009). (Virt. J. Sci. Technol. 20th July 2009).
  32. Anomalous Thermoelectric power of over-doped Bi2Sr2CaCu2O8 superconductor,
    V. P. S. Awana, J. K. Bains, G. S. Okram, Ajay Soni and H. Kishan,
    J. Appl. Phys. 106, 096102 (2009).
  33. Electrical properties of polyaniline doped with metal ions,
    J. B. M. Krishna, A. Saha, G. S. Okram, Ajay Soni, S. Purakayastha and B. Ghosh,
    J. Phys. D: Appl. Phys. 42, 095404 (2009).
  34. Resistivity and thermopower measurement set-ups in the temperature range of 5-325 K, Ajay Soni and G. S. Okram,
    Rev. Sci. Instru. 79, 125103 (2008).
  35. Anomalous electrical transport in nanocrystalline nickel, G. S. Okram, Ajay Soni and R. Rawat,
    Nanotechnology, 19, 185711 (2008).
  36. Grain size effect on lattice of Ni nanocrystals prepared through polyol method, G. S. Okram, K. N. Devi, H. Sanatombi, Ajay Soni, V. Ganesan and D. M. Phase,
    J. Nanosci. Nanotech. 8, 4127 (2008).
  37. Thickness dependent structural, electronic and optical properties of Ge- nanostructures, S. Tripathi, R. Brajpuriya, A. Sharma, Ajay Soni, G. S. Okram, S. M. Chaudhari and T. Shripathi,
    J. Nanosci. Nanotech 8, 2955 (2008).
  38. Low temperature electrical resistivity of cupric telluride thin films, K. Neyvasagam, N. Soundararajan, Ajay Soni, G. S. Okram, and V. Ganesan, Phys. Stat. Solid. (b) 245, 77 (2008).
  39. Sonochemical Synthesis of Poly (Methyl Acrylate), M. A. J. Rajan, T. Mathavan, T. S. Vivekanandam, S. Umapathy, V. Ganesan, G. S. Okram and Ajay Soni, Sol. Sta. Phenom., 136, 175 (2008).
  40. Ammoximation of Cyclohexanone over nanoporous TS-1 using UHP as an Oxidant, S. Saxena, J. Basak, N. Hardia, R. Dixit, S. Bhadauria, R. Dwivedi, R. Prasad, Ajay Soni, G. S. Okram, and Ajay Gupta,
    Chem. Eng. J. 132, 61 (2007).

Patents

  1. One Step, Low Temperature, Cost Effective, Photo-Chemical Reduction of Graphene Oxide Dispersions for the Commercial Scale Analogous reduced graphene oxide (αr-GO) Production,
    Mahesh Soni, Pawan Kumar, S. K. Sharma and Ajay Soni,
    Patent Application Nunber 201611028125, Publication Date 02/09/2016

Conferences

  1. Thermoelectric Performance through Band Modification and Phonon Engineering in Doped SnTe
    Somnath Acharya, JuhiPandey and Ajay Soni, Invited talk in India-UK workshop on Thermoelectric Materials for Waste-Heat Harvesting, Organized by The Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR, India) and the University of Reading (UK), January 8-10, 2018.
  2. Structural Complexities and Confinement Effects in Layered Materials at Extreme Nanoscale
    Ajay Soni, Invited talk for Material Science Group Seminar, IGCAR, Kalpakkam, TN, January 2, 2018.
  3. State of the Art Thermoelectric Materials for Heat Energy Conversion
    Ajay Soni, Invited talk in National Conference on Recent Trends in Experimental and Theoretical Physics (NCRTETP - 2017), SS University, Palampur, November 23-24, 2017.
  4. Graphene Derivatives at Nanoscale and Applications
    Ajay Soni, Invited talk in Conference on "Sepctroscopy of Emerging Functional Materials” (SEFM-2017), School of Basic Sciences, Indian Institute of Technology Mandi, October 9-10, 2017.
  5. Functionalization of Graphene Oxide Dispersions for Conductive Inks and Supercapacitor Applications
    Mahesh Soni, Ajay Soni and Satinder K Sharma, Conference on "Sepctroscopy of Emerging Functional Materials” (SEFM-2017), School of Basic Sciences, Indian Institute of Technology Mandi, October 9-10, 2017. Mahesh won third prize for poster presentation .
  6. Structural Complexities and Confinement Effects in Layered Materials at Nanoscale,
    Ajay Soni, Invited talk in National Conference on "Physics at Small Scales and Advanced Materials” (PSAM-2017), School of Physics, University of Hyderabad, September 8-9, 2017.
  7. Role of Structural Defects and Soft Phonon Modes in Doped Tin Telluride for Thermoelectric Applications,
    Ajay Soni, Invited talk in International Conference on Materials for Advanced Technologies (ICMAT -2017), Symposium DD-02: Chalcogenide based materials innovations for Thermoelectrics I , June 19-23, 2017.
  8. Structural Intricacies in Chalcogenide Materials: Causes and Effects on Thermoelectric Properties,
    Ajay Soni, Invited talk in National Symposium on Technologically Advanced Functional Materials (NSTAFM-2017), Central University of Rajasthan, Kishangarh,Rajasthan, March 16-17, 2017.
  9. Confinement Effects and Phonon Modes in Layered Chalcogenides at Extreme Nanoscale,
    Ajay Soni, Invited talk in International Conference on "Advances in Biological Systems and Materials Science in NanoWorld" (ABSMSNW-2017), IIT BHU, Varanasi, UP, February 19-23, 2017.
  10. Rapid Characterization of Transition Metal Di-Chalcogenides Monolayers by Light-Matter Interactions,
    Juhi Pandey and Ajay Soni, International Conference on "Advances in Biological Systems and Materials Science in NanoWorld" (ABSMSNW-2017), IIT BHU, Varanasi, UP, February 19-23, 2017. Juhi Pandey won second prize for the best technical presentation .
  11. Soft Phonon Modes and Structural Defects in Thermoelectric Materials for Heat Energy Conversion,
    Ajay Soni, Invited talk in 2nd International Conference on Soft Materials (ICSM-2016), MNIT Jaipur, December 12-16, 2016.
  12. Structural Complexity and Phonons in Thermoelectric Materials,
    Ajay Soni, Invited talk in International Conference of Young Researchers on Advanced Materials (IUMRS-ICYRAM 2016), IISc Bangalore, December 11-15, 2016.
  13. Interfaces and defects in bulk thermoelectric nanocomposites of layered chalcogenides,
    Ajay Soni, Invited Talk in Energy materials Nanotechnology (EMN 2016), Prague, Czech Republic, During June 21-24, 2016.
  14. Thermoelectric Power Enhancement in Bulk-Composite of Doped Chalcogenides,
    Somnath Acharya and Ajay Soni, European Materials Research Society Spring Meeting, Lille, France, during May 2-6, 2016.
  15. Light-Matter Interaction in Monolayers of Semiconducting Transition Metal Di-Chalcogenides,
    Juhi Pandey and Ajay Soni, Frontiers in Light-Matter Interaction 2016, at Indian Institute of Technology Ropar, Rupnagar, Punjab, during March 4-5, 2016.
  16. Improved Thermoelectric Performance in Manganese Doped Tin Telluride,
    Somnath Acharya and Ajay Soni, International Conference on Materials Science & Technology (ICMTech -2016), University of Delhi, during 01 - 04 March, 2016.
  17. Thermoelectric Performance of Bulk Composites of 2D Nanoplatelet,
    Ajay Soni, Invited talk in "Recent Trends in Thermoelectric Materials : Fundamentals to Applications", 2nd Indo-US workshop on Thermoelectrics, during December 15-17, 2014 at National Physical Laboratory, New Delhi.
  18. Dual Gate Tunable and High Responsivity Graphene Based Field Effect Transistor,
    Mahesh Soni, Satinder Kumar Sharma, Ajay Soni, International Conference on Soft Materials- ICSM2014, during 06-10 October, 2014, held at MNIT, Jaipur, India.
  19. Role of Interfaces in Thermoelectric Performance of Bulk Nanocomposites,
    Ajay Soni and Q. Xiong, Invited talk in International Union of Materials Research Society, International Conference in Asia - 2013 (IUMRS-ICA 2013), Decmber 16-21st, 2013, held at IISc Bangalore, India.
  20. Interface crystallization and thermoelectric performance of n-type Bi2(Te/Se)3 nanoplatelet composites,
    Ajay Soni and Q. Xiong, International Conference on Advanced Materials (IUMRS-ICAM 2013) Qingdao, China.
  21. Ambipolarity in the Performance of Thin WS2 Device Due to Extrinsic Effects
    Ajay Soni, C. Leiqiang, Z. Ghorannevis and Goki Eda, ICMAT 2013, Singapore.
  22. Interface crystallization and thermoelectric performance of n-type Bi2(Te/Se)3 nanoplatelet composites,
    Ajay Soni, Y. Zhao, Y. Shen, M. Yin, L.Yu, X. Hu, Z. Dong, K. K. Aik, M. S. Dresselhaus and Q. Xiong, E-MRS 2013, SPRING MEETING, Strasbourg, France.
  23. Energy Filtered Enhancement of Thermoelectric Properties of Spark Plasma Sintered Bi2Te3-xSex Nanoplatelet Composites,
    Ajay Soni, Y. Zhao, Y. Shen, M. Yin, L.Yu, X. Hu, Z. Dong, Khiam Aik Khor, Mildred S. Dresselhaus and Qihua Xiong, MRS Fall, November 2012.
  24. Fewer Quintuple Layer Topological Insulator Bi2Se3 Nanoplatelets: Polyol Synthesis and Raman Spectroscopy,
    Qihua Xiong, Jun Zhang, Zeping Peng, Ajay Soni, Yanyuan Zhao, Bo Peng, IPS Meeting, Singapore (2011)
  25. Magnetism in nanostruturally twinned core-shell nickel,
    Ajay Soni and G. S. Okram, The 2008 Asian Conference on Nanoscience and Nanotechnology (ASIA NANO-2008), Singapore.
  26. Synthesis and Characterization of Gold Nanoparticles in Mesoporous Titanium Silicate for Catalysis,
    S. Saxena, Ajay Soni, G. S. Okram and R. Prasad, II International Symposium on Materials Chemistry (Dec. 2008), Bhabha Atomic Research Center, Mumbai.
  27. Shape and size dependent red shift in surface plasmon absorption band of nanocrystalline silver,
    Ajay Soni, G. S. Okram and V. Ganesan, Indo-Australian Symposium on Multifunctional Nanomaterials, Nanostructures and Applications (Dec 2007), Delhi University, Delhi, India.
  28. Thickness dependent structural, transport and optical properties of Ge nanostructures,
    S. Tripathi, A. Sharma, R. Brajpuriya, Ajay Soni, G. S. Okram and T. Shripathi, 8th International Conference on Nanostructured Materials (Nano-2006), Indian Institute of Science, Bangalore.
  29. Grain Size Effect on Lattice of Ni Nanocrystals Prepared Through Polyol Method,
    G. S. Okram, K. N. Devi, H. Sanatombi, Ajay Soni, V. Ganesan, and D. M. Phase, International conference on Advance Nanomaterials 2007,
.