Department of Physics

Prof SC Ray

College of Science, Engineering and Technology
School of Science
Department: Physics
Professor
Tel: 011 670 9065
Fax: 011 670 3643
E-mail: Raysc@unisa.ac.za

Qualifications

  • Ph.D. in Physics (University of North Bengal, India. 2000)

NRF Rating

B3

Fields of academic interests

Research interests

  • Graphene, Graphene-nanoflakes (GNFs) with silicon/nitrogen/hydrogen functionalization, Carbon nano-balls (CNBs), Carbon nano-particles (CNPs), Carbon quantum dots (CQDs), Carbon Nanotubes (CNTs) with nitrogen /Cl2 /O2 funtionalizations. Amorphous carbon (a-C), Graphite, Diamond like carbon (DLC) with silicon/nitrogen functionalization, Boron-carbon-nitride (BCN) alloys thin films, Ultra-thin tetrahedral carbon (ta-C) and Ultra-nano-crystalline diamond (UNCD) thin films.
  • ZnO-nanowire(NWs)/nanorods(NRs)/quantum dots(QDs) with/without Au, Co, Mg doped and Group III-Nitrides nanorod.
  • Electronic/photovoltaic materials: Polycrystalline Oxides (SnO2, CuO, ZnO etc), Metallic Sulphides (SnS, SnS2, CuS, MoS2, CdS, ZnS, and mixed ternary CdxZn1-xS) and nanocrystallites (CdSe CdTe)
  • Ceramic & PZT (Bulk and thin films): Fe3O4:Al,  Pb1-xCaxO3, Pb(ZrxTi1-x)O3 and BaTiO3; High density and High k SiO2.
  • Thin film deposition process that are used for those materials are RF Magnetron Sputtering, Dip coating and spin coating, CVD/PECVD, ECR and Electro deposition methods/techniques.
  • Characterizations were performed using UV-VIS, FTIR, Raman, AFM/STM, XRD, XPS, SEM/EDS, Profilometry, NMR, Synchrotron Radiation based Spectroscopy / Microscopy (XANES, Valence-Band PES, PEEM, SPEM), Electron Field Emission, Electrical and thermal transport, Magnetic properties, Piezo-response properties for PZT thin films, Mechanical (Hardness and Young’s modulus) behaviors.
  • Characterizations were performed using UV-VIS, FTIR, Raman, AFM/STM, XRD, XPS, SEM/EDS, Profilometry, NMR, Synchrotron Radiation based Spectroscopy / Microscopy (XANES, Valence-Band PES, PEEM, SPEM), Electron Field Emission, Electrical and thermal transport, Magnetic properties, Piezo-response properties for PZT thin films, Mechanical (Hardness and Young’s modulus) behaviors.

Field of Specialisation

  • Nano-Science and Nano-technology
  • Materials Sciences
  • Condensed Mater Physics

Books

  • Sekhar Chandra Ray “Applications of Graphene and Graphene-Oxide Based Nanomaterials”. ELSEVIER, 2015, Micro and Nano Technologies Series, ISBN: 978-0-323-37521-4.

  • Carbon Nanomaterials for Biological and Medical Applications by Sekhar Chandra Ray and Nikhil Ranjan Jana. E-Book ISBN: 9780323479073, Hardcover ISBN: 9780323479066, Imprint: Elsevier

  • Book Article: G.Fanchini, S.C.Ray and A.Tagliaferro “Optical properties of a-C” Properties of amorphous carbon - Edited by S.R.P. Silva, EMIS data review series No.29, Pages: 113-121, INSPEC publication, STEVENAGE, 2003. ISBN: 0852969619

  • Book Article: G.Fanchini, S.C.Ray and A.Tagliaferro “The optical properties of amorphous non-nitrogenated and nitrogenated carbon films [a-C(N)(:H)]: analogies and differences’’ Physics and Applications of Disordered Materials - Edited by P. Mihai, ISBN: 97398742829789739874281, OCLC Number: 51844203,  INOE@2000, Bucharest, Pages: 131-15.

Journal articles

2017 (5 article + 1 book)

 

** 97. Sekhar C. Ray, D. K. Mishra and Alberto Tagliaferro, Hall Effect Studies and Magnetic Behaviour in Fe-Nanoparticle Embedded Multi Wall CNTs. Journal of Nanoscience and Nanotechnology, Vol. 17, 1–5, 2017.

** 96. Sekhar C. Ray, Gourav Bhattacharya, Mark A.Miller, Sweety Sarma, Ravi Kant Upadhay, James A. McLaughlin, Susanta Sinha Roy, A facile method for the deposition of thermally stable diamond like carbon thin films via carbon dioxide precursor gas. Dia. Rel. Mater. 73, 93-98 (2017)

** 95. Sekhar C. Ray, Sanyasi Sitha and P. Papakonstantinou, “Change of Magnetic Behavior of Nitrogenated Carbon Nanotubes on Chlorination / Oxidation” Int. J. of Nanotechnology 14/(1-6), 356-366 (2017).

**94. Eutilério F.C. Chaúque, Adedeji A. Adelodun, Langelihle N. Dlamini, Corinne J. Greyling, Sekhar C. Ray, J. Catherine Ngila, Synthesis and photocatalytic application of TiO2 nanoparticles immobilized on polyacrylonitrile nanofibers using EDTA chelating agents. Materials Chemistry and Physics, 192, 108-124 (2017)

** 93. Cheng-Hao Chuang, Sekhar C. Ray, Debarati Mazumder, Surbhi Sharma, Abhijit Ganguly, Pagona Papakonstantinou, Jau-Wern Chiou, Huang-Ming Tsai, Hung-Wei Shiu, Chia-Hao Chen, Hong-Ji Lin, Jinghua Guo, and Way-Faung Pong. Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Study. Scientific Reports 7, 42235:1-10 (2017)

Book:

** 92. Carbon Nanomaterials for Biological and Medical Applications by Sekhar Chandra Ray and Nikhil Ranjan Jana. E-Book ISBN: 9780323479073, Hardcover ISBN: 9780323479066, Imprint: Elsevier

 

 2016 (5 article)

** 91. Navneet Soin, Pengfei Zhao, Kovur Prashanthi, Jinkai Chen, Erping Zhou, Tahir Shah, Sekhar C. Ray, Christos Tsonos, Thomas Thundat, Elias Siores, and Jikui Luo, High performance triboelectric nanogenerators based on phase-inversion piezoelectric membranes of poly(vinylidene fluoride)-zinc stannate (PVDF-ZnSnO3) and polyamide-6 (PA6). Nano Energy, 30 (2016) 470-480.

**90. Sekhar Chandra Ray, Comparison of Electronic Structure and Magnetic Properties of Few Layer Graphene and Multiwall Carbon Nanotubes. Advances in Materials Science and Engineering. Volume 2016, Article ID 7362131:1-7 (2016).

** 89. Sekhar C. Ray, Navneet Soin, Way-Faung Pong, Susanta S. Roy, Andr´e M. Strydom, James A. McLaughlin and Pagona Papakonstantinou, Plasma modification of the electronic and magnetic properties of vertically aligned bi-/tri-layered graphene nanoflakes. RSC Adv. 6 (2016), 70913-70924.

**88. Sekhar C. Ray, W.F. Pong, P. Papakonstantinou, Iron, nitrogen and silicon doped diamond like carbon (DLC) thin films: A comparative study. Thin Solid Films 610 (2016) 42–47.

 

** 87. Sekhar C. Ray, W.F. Pong and P. Papakonstantinou, “Electronic Structure and Field Emission Properties of Nitrogen doped Graphene Nano-Flakes (GNFs:N) and Carbon Nanotubes (CNTs:N)” Applied Surface Science  380 (2016) 301-304.

2015 (4 article + 1 book)

** 86. Y.F. Wang, Shashi B. Singh, Mukta V. Limaye, Y. C. Shao, S.H. Hsieh, L.Y. Chen, H.C. Hsueh, H.T. Wang, J.W. Chiou, Y.C. Yeh, C.W. Chen, C.H. Chen, Sekhar C. Ray, J. Wang, W.F. Pong, Y. Takagi, T. Ohigashi, T. Yokoyama, N. Kosugi, “Visualizing chemical states and defects induced magnetism of graphene oxide by spatially-resolved-X-ray microscopy and spectroscopy” Nature - Scientific Reports (NPG), 2015, Vol. 5, No.15439:1-12

** 85. Sekhar C. Ray, D.K. Mishra, André M. Strydom and P. Papakonstantinou, “Magnetic Behavioural Change of Silane Exposed Graphene Nanoflakes”. J. Appl. Phys. 118, 115302:1-5 (2015);

** 84. Sekhar C. Ray  and I.-N. Lin. “Ferroelectric behaviours of ultra-nano-crystalline diamond thin films”. Surface & Coatings Technology”, 271 (2015) 247–250

** 83. Sekhar C. Ray, Susanta Kumar Bhunia, Arindam Saha and Nikhil R. Jana, ”Graphene Oxide (GO) / Reduced-GO and their Composite with Conducting Polymer Nanostructure Thin Films for Non-volatile Memory Device” Microelectronic Engineering, 146 (2015) 48–52

 

Book

** 82. Sekhar Chandra Ray “Applications of Graphene and Graphene-Oxide Based Nanomaterials”. ELSEVIER, 2015, Micro and Nano Technologies Series, ISBN: 978-0-323-37521-4.

 

2014 (6 article)

** 81. Sekhar C. Ray, W. Mbiombi and P. Papakonstantinou, “Electrical and Electronic Properties of nitrogen doped amorphous carbon (a-CNx) thin films” Current Appl. Phys. 14 (2014) 1845-1848

** 80. Sekhar C. Ray, W. Mbiombi and P. Papakonstantinou, “Diamond like Carbon (DLC) Thin Films: Preparation and Characterization” Applied Mechanics and Materials, Vol. 575, pp. 292-295 (2014).

** 79 C.-H. Chuang, Y.-F. Wang, Y.-C. Shao, Y.-C. Yeh, D.-Y. Wang, C.-W. Chen, J. W. Chiou, Sekhar C. Ray, W. F. Pong, L. Zhang, J. F. Zhu, J. H. Guo,Effect of Thermal Reduction on Photoluminescence and Electronic Stuctures of Graphene Oxides” Nature - Scientific Reports (NPG), 2014, Vol. 4, No. 4525:(1-7)

** 78. Sekhar C. Ray, Navneet Soin, Thuto Makgato, C. H. Chuang, W.F. Pong, Susanta S. Roy, Sarit K. Ghosh, André M. Strydom, J. McLaughlin “Graphene Supported Graphone/Graphane Bilayer Nanostructure Material for Spintronics” Nature - Scientific Reports (NPG), 2014, Vol. 4, No. 3862:(1-7)

*77. Sekhar C. Ray, Zikhona N. Tetana, Rudolph Erasmus, Ashish Mathur, Neil J. Coville, “Carbon Spheres for Energy Applications: Raman and X-ray Photoemission Spectroscopy Studies” Int. J of Energy research, 2014 Vol 38, issue 4, pp. 444-451

*76. Sekhar C. Ray, Zikhona N. Tetana, Rudolph Erasmus, Way-Faung Pong, Neil J Coville, “Nitrogen-doped Carbon Spheres: An X-ray Absorption near Edge Structure Spectroscopy Study”, Appl. Phys. A, 2014, Vol 115, No.1, pp.153-157.

 

2013 (6 article)

 

*75. Sekhar C. Ray, Susanta Kumar Bhunia, Arindam Saha and Nikhil R. Jana, “Electronic and fero-electric behaviours of Polymer coated Graphene-oxide thin film”. Physics Procedia, 2013, vol 46, pp. 62-70.

*74. Sekhar Chandra Ray and Kaushik Mallick, “Cadmium Telluride (CdTe) Thin Film for Photovoltaic Applications” Int. J. of Chem. Eng. & Appl. 2013, vol.4. no.4, pp. 183-186.

*73. Chia-Liang Sun, Chih-Wen Pao, Huang-Ming Tsai, Jau-Wern Chiou, Sekhar C. Ray, Houng-Wei Wang, Michitoshi Hayashi, Li-Chyong Chen, Hong-Ji Lin, Jyh-Fu Lee, Li Chang, Min-Hsiung Tsai, Kuei-Hsien Chen, Way-Faung Pong, “Atomistic nucleation sites of Pt nanoparticles on N-doped carbon nanotubes” Nanoscale  2013, vol. 5(15), pp. 6812-6818.

* 72. Pradip Das, Arindam Saha, Amit Ranjan Maity, Sekhar C. Ray and Nikhil R. Jana, “Silicon Nanoparticle based Fluorescent Biological Label via Low Temperature Thermal Degradation of Chloroalkylsilane” Nanoscale 2013, vol. 5, pp. 5732-5737

*71. Susanta Kumar Bhunia, Arindam Saha, Amit Ranjan Maity, Sekhar C. Ray and Nikhil R. Jana, “Carbon Nanoparticle-based Fluorescent Bioimaging Probes” Nature - Scientific Reports (NPG), 2013, Vol. 3, No. 1473 (1-7)

*70. Sharbari Palmal, SK Basiruddin, Amit Ranjan Maity, Sekhar C. Ray and Nikhil R. Jana, “Thiol-Directed Synthesis of Highly Fluorescent Gold Clusters and Their Conversion into Stable Imaging Nanoprobe” Chemistry - A European Journal 19 (2013) 943 – 949.

2012 (5 article)

*69. Sekhar C. Ray, R. M. Erasmus, H. M. Tsai, C. W. Pao, I.-N. Lin and W.F. PongHydrogenation effects of ultra-nano-crystalline diamond detected by x-ray absorption near edge structure and Raman spectroscopy” Japanese Journal of applied Physics, 51 (2012) 095201 (1-5).

*68.  J.W. Chiou, Sekhar C. Ray, S.I. Peng, C.H. Chuang, B.Y. Wang, H.M. Tsai, C.W. Pao, H.-J. Lin, Y.C. Shao, Y.F. Wang, S.C. Chen, W.F. Pong, Y.C. Yeh, C.W. Chen, L.-C. Chen, K.-H. Chen, M.-H. Tsai, A. Kumar, A. Ganguly, P. Papakonstantinou, H. Yamane, N. Kosugi,T. Regier, L. Liu and T. K. Sham, “Nitrogen-functionalized Graphene Nano-flakes (GNFs:N): Tunable Photoluminescence and Electronic Structures” J. Phys. Chem. C 116 (2012) 16251−16258

*67. Navneet Soin, Susanta Sinha Roy, Sekhar Chandra Ray, Patrick Lemoine, Md. Anisur Rahman, Paul D. Maguire, Sushanta K. Mitra and James A. McLaughlin, “Thickness dependent electronic structure of ultra-thin tetrahedral amorphous carbon (ta-C) films” Thin Solid Films, 520 (2012) 2909-2915

* 66. Ashish Mathur, Susanta Sinha Roy, Shikha Wadhwa, Sekhar Chandra Ray, Kiran Hazra, Devi Shankar Misra, Sushanta Kumar Mitra, James McLaughlin, and Thomas Thundat “Substrate Effects on the Growth of Multiwalled Carbon Nanotubes by Thermal Chemical Vapor Deposition”  Adv. Sci. Lett. 7 (2012) 21-26.

*65. A. Mathur, S.S. Roy, K. S. Hazra,  S. Wadhwa, S.C. Ray, D. S. Misra, S.K. Mitra and J. A. McLaughlin, “Oxygen Plasma assisted end-opening and field emission enhancement in vertically aligned multiwall carbon nanotubes” Materials Chemistry and Physics, Vol. 134, (2012) 425-429.

 

2011 (7 article)

*64. Sekhar Chandra Ray, Huang-Ming Tsai, Huang-Chin Chen, Shang-Lun Wu, Dah-Chin Ling, I-Nan Lin, and Way-Faung Pong, “Electronic Structure, Electron Field Emission and Magnetic Behaviors of Carbon Nanotubes Fabricated on La0.66Sr0.33MnO3 (LSMO) for Spintronics Application” J. NanoSci. & Nanotech. Vol.11, (2011) 10710-10714

*63. S. C. Ray, D. R. Sahu, and P. Papakonstantinou, Dia-Magnetic to Ferro-Magnetic Behavioral Change of Fe-Catalysts Based Nitrogenated Carbon Nanotubes (NCNTs) by the Process of Chlorination/Oxidation, J. Nano. Sci. & Nanotech. 11, 8269-8273 (2011)

*62. S. C. Ray, H. C. Hsueh, C. H. Wu, C. W. Pao, K. Asokan, M. T. Liu, H. M. Tsai, C. H. Chuang, W. F. Pong, J. W. Chiou, M.-H. Tsai, J. M. Lee, L. Y. Jang, J. M. Chen and J.F. Lee, “Local atomic and electronic structures and ferroelectric properties of PbZr0.52Ti0.48O3: An x-ray absorption study” Appl. Phys. Lett. 99, 042909 (2011)

 

*61. S.C. Ray, H.M. Tsai, C.W. Pao, W.H. Chang, W.F. Pong, J.W. Chiou, M.-H. Tsai, “Electronic and bonding properties of Fe- and Ni based hydrogenated amorphous carbon thin films by X-ray absorption, valence-band photoemission and Raman spectroscopy” Diamond & Related Materials 20 (2011) 886–890

*60. Ashish Mathur, Susanta Sinha Roy, Sekhar Chandra Ray, Kiran Shankar Hazra, Jeremy Hamilton, Calum Dickinson, James McLaughlin and Devi Shankar Misra, “Enhancement of Field Emission Characteristics of Carbon Nanotubes on Oxidation” J. Nanosci. Nanotechnol. 11, 7011-7014 (2011)

*59. S.C. Ray, Arindam Saha, SK Basiruddin S. S. Roy and Nikhil R. Jana, “Graphene and Graphene Oxide via Polyacrylate Coating” Diamond & Related Materials 20 (2011) 449–453, cited times:10

*58. J. W. Chiou, S. C. Ray, H. M. Tsai, C. W. Pao, F. Z. Chien, W. F. Pong, C. H. Tseng, J. J. Wu, M.-H. Tsai, C.-H. Chen, H. J. Lin, J. F. Lee, and J.-H. Guo; “Correlation between electronic structures and photocatalytic activities of nanocrystalline-(Au, Ag, and Pt) particles on the surface of ZnO nanorods”, J. Phys. Chem. C, 115, (2011) 2650–2655

 

2010 (6 article)

*57. Arindam Saha, SK Basiruddin,  S.C. Ray, S. S. Roy and Nikhil R. Jana, “Functionalized Graphene and Graphene Oxide Solution via Polyacrylate Coating” 2010 Nanoscale; 2/12, 2777-2782

*56. S. C. Ray, S.K Ghosh, Z. Chiguvare, U. Palnitkar, W. F. Pong, I-Nan Lin, P. Papakonstantinou and A.M. Strydom, “Electron Field Emission of silicon-doped diamond like carbon thin films” 2010 Jpn. J. Appl. Phys. 49 (2010) 111301

*55. N. Soin, S.S. Roy, S.C. Ray and J.A. McLaughlin “Excitation energy dependence of Raman Bands in Multi Walled Carbon Nanotubes” Journal of Raman Spectroscopy 2010, 41, 1227-1233

*54. C. W. Pao, S. C. Ray, H. M. Tsai, Y. S. Chen, H.-C. Chen, I.-N. Lin, W. F. Pong, J. W. Chiou, M.-H. Tsai, N. G. Shang, P. Papakonstantinou and J.-H. Guo; Change of structural behaviors of organo-silane exposed graphene nanoflakes”  J. Phys. Chem. C  114, 8161–8166 (2010)

*53. S.C. Ray, S. Bhattacharyya, S.L. Wu, D.C. Ling, W.F. Pong, M. Giorcelli, S. Bianco and A. Tagliaferro, “High Coercitivity Magnetic Multi-wall Carbon Nanotubes for Low Dimensional High-density Magnetic Recording Media” 2010 Diam. and relat. Mater. 19 (2010) 553–556

*52. W. L. Huang, J. Labis, S. C. Ray, Y. R. Liang, C. W. Pao, H. M. Tsai, C. H. Du, W. F. Pong, J. W. Chiou, M.-H. Tsai, H. J. Lin, J. F. Lee, Y. T. Chou,J. L. Shen, C. W. Chen, and G. C. Chi; “Determination of the microstructure of Eu-treated ZnO nanowires by x-ray absorption” Appl. Phys. Lett. 96, 062112 (2010)

 

2009 (3 article)

*51. S.C. Ray, Arindam Saha, Nikhil R. Jana and Rupa Sarkar, “Fluorescent Carbon Nanoparticle: Synthesis, Characterization and Bio-imaging Application” J. Phys. Chem. C, Vol. 113, issue 43 (2009) 18546 -51.

 

50. S.C. Ray, C.W. Pao, H.M. Tsai, H.-C. Chen, Y.S. Chen, D.C. Ling, I.-N. Lin, W.F. Pong, S. Gupta, M. Giorcelli, S. Bianco, S. Musso and A. Tagliaferro “Effects of high-temperature thermal annealing on multi-walled carbon nanotubes: Electronic structure, Electron field emission and Magnetic behaviors” J. NanoSci. & Nanotech. Vol. 9, No.12 (2009) 6799 – 6805.

49. S. C. Ray, U. Palnitkar, C.W. Pao, H.M. Tsai, W. F. Pong, I-Nan Lin, P. Papakonstantinou, L. C. Chen and K. H. Chen, “Enhancement of field emission of nitrogenated carbon nanotubes on chlorination” Diam. Rel. Mater, 18, 457–460 (2009)

 

2008 (3 articles)

48. S.C. Ray, U. Palnitkar, C.W. Pao, H.M. Tsai, W. F. Pong, I-Nan Lin, P. Papakonstantinou, Abhijit Ganguly, L. C. Chen and K. H. Chen, “Field emission effects of nitrogenated carbon nanotubes on chlorination and oxidation” J. Appl. Phys. 104, 063710 (2008); Also selected and published in Virtual Journal of Nanoscale Science & Technology, Volume 18, Issue 14 (Oct.6, 2008).

47. S. C. Ray, “Is Carbon nanotubes are the nano-electronics device based material for the future world?” International Journal of NanoManufacturing, Vol. 2, No. 5, pp. 517-20 (2008)

46. M.T. Liu, S.C. Ray, H.M. Tsai, C.W. Pao, D.C.Ling,W.F.  Pong, J.W. Chiou, M.-H.Tsai, L. Y. Jang, T.W.Pi, J. F. Lee, C.Y.Lin. and T. S. Chin, “Correlation between magnetic properties and the electronic structures of soft magnetic ternary Fe78−xYxB22 (x = 4–9) bulk metallic glasses” J. Phys.: Condens. Matter 20, 465105 (2008)

 

2007 (8 articles)

45. T. I. T. Okpalugo and S. C. Ray, “Thermal annealing effects on structural properties of Si-doped/undoped a-CH thin films”  Iranian Physical Journal 1(3), 47-50 (2007)

44. S. C. Ray, Y. Low, H. M. Tsai, C. W. Pao, J. W. Chiou, S. C. Yang, F. Z. Chien, W. F. Pong, M.-H. Tsai, K. F. Lin, H. M. Cheng and W. F. Hsieh and J. F. Lee "Size dependence electronic structures and electron-phonon coupling of ZnO quantum dots” Appl. Phys. Lett. 91, 262101 (2007); Also selected and published in Virtual Journal of Nanoscale Science & Technology, Volume 17, Issue 2 (Jan.14, 2008)

43. S.C. Ray, C. W. Pao, H. M. Tsai, J. W. Chiou W. F. Pong, C. W. Chen, M.-H. Tsai, P. Papakonstantinou, L. C. Chen and K. H. ChenA comparative study of the electronic structures of oxygen- and chlorine-treated nitrogenated carbon nanotubes by x-ray absorption and scanning photoelectron microscopy” Appl. Phys. Lett. 91, 202102 (2007); Also selected and published in Virtual Journal of Nanoscale Science & Technology, Volume 16, Issue 22 (Nov.26, 2007)

42. S. C. Ray, C. W. Pao, H. M. Tsai, J. W. Chiou, W. F. Pong, C. W. Chen, M.-H. Tsai, P. Papakonstantinou, L. C. Chen, K. H. Chen and W. G. Graham, “Electronic structures and bonding properties of chlorine-treated nitrogenated carbon nanotubes: X-ray absorption and scanning photoelectron microscopy study” Appl. Phys. Lett. 90, 192107 (2007). Also selected and published in Virtual Journal of Nanoscale Science & Technology, Volume 15, Issue 20 (May 21, 2007)

41. J. W. Chiou, S. C. Ray, H. M. Tsai, C. W. Pao, F. Z. Chien, W. F. Pong, M.-H. Tsai,  J. J. Wu, C. H. Tseng,  C.-H. Chen, J. F. Lee   and  J.-H. Guo, “Charge transfer in nc-Au/ZnO-nanorods investigated by x-ray spectroscopy and scanning photoelectron microscopy” Appl. Phys. Lett. 90, 192112 (2007).  Also selected and published in Virtual Journal of Nanoscale Science & Technology, Volume 15, Issue 20 (May 21, 2007)

40. S. C. Ray, K. P. Krishna Kumar, H. M. Tsai, J. W. Chiou, C. W. Pao, W. F. Pong M.-H. Tsai, B.-H. Wu, C.-R. Sheu, C.-C. Chen, Franklin C.-N. Hong, H.-H. Cheng and A. Dalakyan,“Studies of Ion irradiation effects in hydrogenated amorphous carbon thin films by X-ray Absorption and Photoemission Spectroscopy”. Thin Solid Films, 516, 3374 (2007).

39. S.C. Ray, C.W. Pao, H. M. Tsai, J. W. Chiou, W. F. Pong, M.-H. Tsai, T.I.T. Okpalugo, P. Papakonstantinou and T. W. Pi “Enhancement of sp3-bonding in high-bias-voltage grown diamond-like carbon thin films studied by x-ray absorption and photoemission spectroscopy” J. of Physics: Condensed matter 19, 176204 (2007)

38. H. M. Tsai, S. C. Ray, C. W. Pao, J. W. Chiou, C. L. Hung, C. H. Du and W.F. Pong , M.-H. Tsai, A. Fukano and H. Oyanagi, “Enhancement of Si-O hybridization in low-temperature grown ultraviolet photo oxidized SiO2 film observed by x-ray absorption and photoemission spectroscopy” J. Appl. Phys. 103, 013704 (2007)

 

2006 (6 articles)

37. S.C. Ray, J.W. Chiou, W.F. Pong, M.H. Tsai, “The Electronic Properties of nanomaterials Elucidated by Synchrotron Radiation-based Spectroscopy ”, Critical Reviews in Solid State and Materials Sciences 31, 91-110 (2006)

36. J. W. Chiou, H. M. Tsai, C. W. Pao, K. P. Krishna Kumar, S. C. Ray, F. Z. Chien, W. F. Pong, M.-H. Tsai, C.-H. Chen and H.-J. Lin, J. J. Wu, M.-H. Yang, S. C. Liu, S. H. Chung and C. W. Chen , “Comparison of the electronic structures of Zn1-xCoxO and Zn1-xMgxO nanorods using x-ray absorption and scanning photoelectron microscopy” Appl. Phys. Lett. 89, 043121 (2006).

35. C. W. Pao, P. D. Babu, H. M. Tsai, J. W. Chiou, S. C. Ray, S. C. Yang, F. Z. Chien, W. F. Pong, M.-H. Tsai, L. C. Chen, C. C. Chen, K. H. Chen, H.-J. Lin, J. F. Lee and G. H. Guo, “Electronic structures of group III-nitride nanorods studied by x-ray absorption, x-ray emission and Raman spectroscopy” Appl. Phys. Lett. 88 (22), 223113 (2006).

34. S.C. Ray, C.W.Pao, H. M. Tsai, J. W. Chiou, W. F. Pong, B. Bose, D. DasGupta, “Orientation of graphitic planes during annealing of dip deposited amorphous carbon film: An X-ray absorption near-edge study” Carbon 44, 1982-1985 (2006)

33. T.I.T. Okpalugo, H. Murphy, G. Abbas, P.D. Maguire, J. McLaughlin, A.A. Ogwu, S.C. Ray, R. W. McCullough, “Human micro-vascular endothelial cellular interaction with N-doped DLC compared with Si-doped DLC thin films”, Journal of Biomedical Materiales Research PART B-Applied Biomateriales, 78B (2), 222 – 229 (2006)

32. S.C. Ray, M. Algueró, J. Ricote, M. L. Calzada, C. Prieto, A de Andrés and M. Garcia-Hernández, “RF magnetron sputtering ferroelectric PbZr0.52Ti0.48O3 thin films with (001) preferred orientation on colossal magneto resistive layers” Materials Letter 60, 1714 –1718 (2006)

 

2005 (7 articles)

31. S.C. Ray, G. Fanchini and A. Tagliaferro, “Luminescence, recombination and light soaking of a-CN:OH films grown by reactive sputtering” Journal of Materials Science 40/20, 5451-5455 (2005)

30. S.C. Ray, C.W.Pao, H. M. Tsai, J. W. Chiou, W. F. Pong, R. McCann, S. .S. Roy, P. Papakonstantinou and J. McLaughlin, “Electronic properties of a-CNx thin films: An X-ray absorption and Photoemission spectroscopy study” J. Appl. Phys. 98, 33708 (2005).

29. S.C. Ray, T.I.T. Okpalugo, H. M. Tsai, J. W. Chiou, W. F. Pong, W. J. Wang, P. Papakonstantinou and J. A. McLaughlin, “Electronic structure and Photoluminescence study of Silicon doped diamond like carbon (Si:DLC) thin films” Material Research Bulletin 40/10, 1757-1764 (2005).

28. S.C. Ray, T.I.T. Okpalugo, P. Papakonstantinou, H. M. Tsai, J. W. Chiou, W. F. Pong,  J. A. McLaughlin and W. J. Wang,  “Electronic structure and hardening mechanism of Si-doped/undoped diamond like carbon films” Thin Solid Films 482, 242-247 (2005)

27. R. McCann, S. S. Roy, P. Papakonstantinou, J. McLaughlin and S.C. Ray, “Spectroscopic analysis of a-C and a-CNx films prepared by ultrafast high repetition rate pulsed laser deposition” J. Appl. Phys 97, 73522 (2005)

26. J. C. Jan, P. D. Babu, H. M. Tsai, C.W. Pao, J. W. Chiou, S.C. Ray, K. P. Krishna Kumar W. F. Pong, M.-H. Tsai, C. A. Jong and T. S. Chin, “Bonding properties of amorphous Ta(N,O) films investigated by x-ray absorption spectroscopy” Appl. Phys. Lett. 86, 161910 (2005).

25. C. K. Yang, J. W. Chiou, H. M. Tsai, C.W. Bao, J. C. Jan, S.C. Ray, C. L. Yeh, K. C. Huang, H. C. Hsueh and W. F. Pong M.-H. Tsai H. H. Hsieh H. J. Lin and T. Y. Hou J. H. Hsu, “Electronic structure and magnetic properties of Al-doped Fe3O4 films studied by x-ray absorption and magnetic circular dichroism” Appl. Phys. Lett. 86, 62504 (2005).

 

2004 (5 Articles)

24. S.C. Ray, C. W. Bao, H. M. Tsai, J. W. Chiou, J. C. Jan, K. P. Krishna Kumar, W. F. Pong M.-H. Tsai W. J. Wang T. I. T. Okpalugo, P. Papakonstantinou and J. A. McLaughlin, “Electronic structure and bonding properties of Si-doped hydrogenated amorphous carbon films” Appl. Phys. Letter 85, 4022 - 4024 (2004)

23. S. C. Ray, H. M. Tsai, B. Bose, J. W. Chiou, J. C. Jan, Krishna Kumar, W. F. Pong, D. DasGupta and M.- H. Tsai, “X-ray absorption spectroscopy (XAS) study of dip deposited a-C:H(OH) thin films”  J. of Physics: Condensed matter 16, 5713-5719 (2004)

22. S. C. Ray, H. M.Tsai,  J. W. Chiou, J. C. Jan, Krishna Kumar, W. F. Pong, M.-H. Tsai, S. Chattopadhyay, L. C.Chen,  S. C. Chen , S. T. Lin, and K. H. Chen, “Electronic and bonding structures of B-C-N thin films investigated by x-ray absorption and photoemission spectroscopy” J. Appl. Phys 96, 208 – 211 (2004)

21. S.C. Ray, H. M.Tsai, J. W. Chiou, J. C. Jan, Krishna Kumar, W. F. Pong, M.-H. Tsai, S. Chattopadhyay, L. C. Chen,  S.C. Chien , S. T. Lin, and K. H. Chen, “X-Ray absorption study of Boron–Carbon-Nitrogen (BxCyNz) ternary alloy films” Diamond and Related Materials 13, 1553 – 1557 (2004) 

20. S.C. Ray, B. Bose, J. W. Chiou, H. M. Tsai, J. C. Jan, Krishna Kumar, W. F. Pong, D. Dasgupta, G. Fanchini and A. Tagliaferro, “Deposition and Characterization of Diamond-like carbon (DLC) thin films by Electro-deposition Technique using organic liquid” J. Mater. Res. 19, 1126 – 1132 (2004)

 

2003 (6 articles + 1 book chapter)

19. S.C. Ray, G.Fanchini, A.Tagliaferro, B.Bose and D.DasGupta, “Amorphous carbon films prepared by ‘Dip’ technique: Deposition and film characterization” J. of Appl. Phys. 94, 870 – 878 (2003)

18. G.Fanchini, S.C.Ray, and A. Tagliaferro, “Electronic and vibrational structure of amorphous carbon nitride” Diamond and Related Materials 12, 208 – 218 (2003).

17. G.Fanchini, S.C.Ray, and A. Tagliaferro, “Density of electronic states in amorphous carbons” Diamond and Related Materials 12, 891 – 899 (2003).

16. G.Fanchini, S.C.Ray, A. Tagliaferro, V-M. Tiainen and T. Sajavaara, “Effect of isotopic substitution on IR and ESR properties of mass selected ion beam deposited ta-C films” Diamond and Related Materials 12, 900 – 904 (2003)

15. G.Fanchini, S.C.Ray and A. Tagliaferro, “Photoluminescence investigation of carbon nitride-based films deposited by reactive sputtering” Diamond and Related Materials 12, 1084 – 1087 (2003)

14. J. C. Jan, Krishna Kumar, J. W. Chiou, H.M. Tasi, H.L.Shih, H.C. Hsueh, S.C. Ray, K. Asokan, W. F. Pong, M.H.Tasi, Shou-Yi Kuo and Wen-Feng Hsieh, “Effect of the Ca content on the electronic structure of Pb1-xCaxTiO3 perovskites” Appl. Phys. Lett. 83, 3311 – 3313 (2003)

13. Book Article: G.Fanchini, S.C.Ray and A.Tagliaferro “Optical properties of a-C” Properties of amorphous carbon - Edited by S.R.P. Silva, EMIS data review series No.29, Pages: 113-121, INSPEC publication, STEVENAGE, 2003. ISBN: 0852969619

 

2002 (4 articles + 1 book chapter)

 

12. G.Fanchini, S.C.Ray and A. Tagliaferro, “Optical properties of disorder carbon based-materials” Surface and Coating Technol. 151 & 152, 233 – 241 (2002)

11. G. Fanchini, G. Messina, A. Paoletti, S.C.Ray, S.Santangelo, A.Tagliaferro and A. Tucciarone,“Relationship between composition and position of Raman and IR peaks in amorphous carbon alloys” Surface and Coating Techno. 151 & 152, 257 – 262 (2002)

10. G.Fanchini, S.C.Ray, A. Tagliaferro and E.Laurenti, “Paramagnetic centres and microstructure of reactively sputtered amorphous carbon nitride thin films” Diamond and Related Materials 11, 1143- 1148 (2002).

9. G. Fanchini, S.C.Ray, A. Tagliaferro and E. Laurenti, “Density and capture radius of ‘Defects’: Quenching of the Luminescence states in non-nitrogenated and nitrogenated amorphous carbon thin films” J. Physics.: Condensed Matter 14, 13231- 13240 (2002)

8. Book Article: G.Fanchini, S.C.Ray and A.Tagliaferro “The optical properties of amorphous non-nitrogenated and nitrogenated carbon films [a-C(N)(:H)]: analogies and differences’’ Physics and Applications of Disordered Materials - Edited by P. Mihai, ISBN: 97398742829789739874281, OCLC Number: 51844203,  INOE@2000, Bucharest, Pages: 131-15.

 

2001 (2 articles)

7. Sekhar C. Ray, “Preparation of Cu2O thin film by the Sol-Gel-like dip-coating technique and study of their structure and optical properties” Solar Energy Materials and Solar Cells 68, 307 – 312 (2001).

6. Sekhar C. Ray, “Preparation and study of Cu2O thin films deposited by the Dip technique” Indian J. of Phys. 75A, 453 – 455 (2001)

 

1997-2000 (5 articles)

5. S.C. Ray “Structure and optical properties of Molybdenum disulphide (MoS2) thin film deposited by dip technique”. J. of Materials Science Letters 19, 803 - 804 (2000)

4. Sekhar C. Ray, Malay K. Karanjai and D. DasGupta “Structure and photoconductive properties of dip deposited SnS and SnS2 thin films and their conversion to tin-dioxide by annealing in air” Thin Solid Films 350, 72-78 (1999)

3. Sekhar C. Ray, Malay K. Karanjai and D. DasGupta “Tin-dioxide (SnO2) based transparent semi-conducting films deposited by the Dip-coating technique” Surface and Coating Technology 102, 73-80 (1998)

2. Sekhar C. Ray, Malay K. Karanjai and D. DasGupta “Deposition   and Characterization of ZnxCd1-xS thin films prepared by the dip technique” Thin Solid Films 322, 117-122 (1998)

1. Sekhar C. Ray, Malay K. Karanjai and D. DasGupta “Preparation and study of doped and undoped tin-dioxide (SnO2) films by Open Air Chemical Vapour Deposition Technique (OACVD)” Thin Solid Films 307, 221-228 (1997)

Projects

  • Graphene-Oxide functionalized with gold (Au) nano-particle for spintronic application
  • ZnO functionalized with gold (Au) nano-particle for spintronic application
  • Graphene-Oxide functionalized iron (Fe) nano-particle for spintronic application
  • MoS2- monolayer thin films for spintronic application
  • Single-crystal, Polycrystal and Nano-rod ZnO thin films for spintronic application
  • ‘Xe’ implanted Poly-crystal ZnO for spintronic application
  • Graphene-oxide functionalized with polymer and conducting polymer materials for spintronic application