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Dr. Subhashis Gangopadhyay

pilani Physics

Professor, Department of Physics,
BITS Pilani, Pilani Campus

Experimental Solid State Physics
Department of Physics, Birla Institute of Technology & Science, Pilani- 333031, Rajasthan. India.
subha@pilani.bits-pilani.ac.in
+91-1596-255714

Publications

 
 
BOOK CHAPTERS
  1. S. Gangopadhyay and Sushil, Scanning Tunneling Microscopy (STM) Imaging of Carbon Nanotropes: C60, CNT and Graphene, Carbon Nanomaterial Electronics: Devices and Applications. Advances in Sustainability Science and Technology. Springer, Singapore (2021). (https://doi.org/10.1007/978-981-16-1052-3_3)
  2. S. Gangopadhyay, Crystalline Silicon Nitride Films on Si (111): Growth Mechanism, Surface Structure and Chemistry down to Atomic Scale, Multilayer Thin Films - Versatile Applications for Materials Engineering, IntechOpen, London (2020). (DOI: 10.5772/intechopen.89412).

PEER REVIEWED JOURNALS

  1. S. Choudhary, A.  Agarwal, V. Saini, A. Hazra, and S. Gangopadhyay, Growth and Characterization of ZnO Nanostructures: Materials for CO and Ethanol Sensing. Computational Mathematics, Nanoelectronics, and Astrophysics. CMNA 2018. Springer Proceedings in Mathematics & Statistics Springer, Singapore 342, 137-149 (2021). (https://doi.org/10.1007/978-981-15-9708-4_12)
  2. A. Hazra, A. Jan, A. Tripathi, S. Kundu, P. K. R. Boppidi, and S. Gangopadhyay, Optimized resistive switching in TiO2 nanotubes by modulation of oxygen vacancy through chemical reduction, IEEE Transactions on Electron Devices 67, 2197-2204 (2020).
  3. R. Aggrawal, S. Kumari, S. Gangopadhyay, and S. K. Saha, Role of Different States of Solubilized Water on Solvation Dynamics and Rotational Relaxation of Coumarin 490 in Reverse Micelles of Gemini Surfactants, Water/12-s-12.2Br– (s = 5, 6, 8)/n-Propanol/Cyclohexane, ACS omega 5, 6738-6753 (2020).
  4. S. Choudhary, A. Agarwal, A. Hazra, and S. Gangopadhyay, CO Gas-Sensing at Low Temperature using CuO Thin Films, IEEE 16th India Council International Conference (INDICON), 1-4 (2019). (doi: 10.1109/INDICON47234.2019.9030294)
  5. P. Das, S. Ganguly, T. Agarwal, P. Maity, S. Ghosh, S Choudhary, S. Gangopadhyay, T. K. Maiti, S. Dhara, S. Banerjee, N. C. Das, Heteroatom doped blue luminescent carbon dots as a nano-probe for targeted cell labeling and anticancer drug delivery vehicle, Materials Chemistry and Physics 237, 121860 (2019).
  6. P. Bindra, S. Gangopadhyay, and A Hazra, 1-D TiO2 Nanorods Array-Based Parallel Electrode Sensor for Selective and Stable Detection of Organic Vapors, IEEE Sensors Journal 20, 664-671 (2019).
  7. P. Das, P. P. Maity, S. Ganguly, S. Ghosh, J. Baral, M. Bose, S. Choudhary, S. Gangopadhyay, S. Dhara, A. K. Das, S. Banerjee, and N. C. Das, Biocompatible carbon dots derived from κ-carrageenan and phenyl boronic acid for dual modality sensing platform of sugar and its anti-diabetic drug release behavior, International journal of biological macromolecules 132, 316-329 (2019).
  8.  S. Choudhary, J. V. N. Sarma, S. Pande, S. Ababou-Girard, P. Turban, B. Lepine, and S. Gangopadhyay, Oxidation Mechanism of Thin Cu Films: A Gateway Towards the Formation of Single Oxide Phase, AIP Adv. 8, 055114 (2018).
  9. P. Bindra, S. Gangopadhyay and A. Hazra, Au/TiO2 Nanotubes/Ti Based Solid State Vapor Sensor: Efficient Sensing in Resistive and Capacitive Modes" IEEE Transactions on Electron Devices 65, 1918 (2018)
  10. S. Choudhary, R Narula, and S. Gangopadhyay, Thin Cu film resistivity using four probe techniques: Effect of film thickness and geometrical shapes, AIP Conf. Proc. 1953, 100054 (2018).
  11. S. Choudhary, and S. Gangopadhyay, Zinc Oxide Nano-structures: From Nano-Wall to Nano-Rod Growth Morphology, AIP Conf. Proc. 1989, 20007 (2018).
  12. S. Choudhary, J. V. N. Sarma, and S. Gangopadhyay, Growth and characterization of single phase Cu2O by thermal oxidation of thin copper films, AIP Conf. Proc. 1724, 020116 (2016).
  13. P. Das, S. Ganguly, S. Mondal, U. K. Ghorai, P. P. Maity, S.Choudhary, S. Gangopadhyay, S. Dhara, S. Banerjee, and N. C. Das, Dual doped biocompatible multicolor luminescent carbon dots for bio labeling, UV-active marker and fluorescent polymer composite, Luminescence. 33, 1136 (2018)
  14. P. Das, S. Ganguly, M. Bose, S.Mondal, S. Choudhary, S.Gangopadhyay, A. K. Das, S. Banerjee, and N. C. Das, Zinc and nitrogen ornamented bluish white luminescent carbon dots for engrossing bacteriostatic activity and Fenton based bio-sensor, Mat. Sci. Engg. C 88, 115 (2018).
  15. S. Ganguly, S. Mondal, P. Das, P. Bhawal, T. K. Das, M. Bose, S. Choudhary, S. Gangopadhyay, A. K. Das, and N. C. Das, Natural saponin stabilized nano-catalyst as efficient dye-degradation catalyst, Nano-Structures & Nano-Objects 16, 86 (2018)
  16. R. Nazir, P. Fageria, M. Basu, S. Gangopadhyay, and S. Pande, Decoration of Pd and Pt Nanoparticles on Carbon Nitride (C3N4) Surface for Nitro- Compounds Reduction and Hydrogen Evolution Reaction, New Journal of Chemistry 41, 9658 (2017).
  17. M. Basu, R. Nazir, C. Mahala, P. Fageria, S. Chaudhary, S. Gangopadhyay, and S. Pande, Ag2S/Ag Heterostructure: A Promising Electrocatalyst for the Hydrogen Evolution Reaction, Langmuir, 33, 3178 (2017).
  18. P. Fageria, S. Uppala, R. Nazir, S. Gangopadhyay, C.-H. Chang, M. Basu, S. Pande, Synthesis of Mono- (Au & Pd) and Bimetallic (AuPd) Nanoparticles Using Carbon Nitride (C3N4) Quantum Dot via Photochemical Route for Nitrophenol Reduction, Langmuir, 32, 10054 (2016).
  19. J. I. Flege, J. Höcker, B. Kaemena, T. O. Mentes,  A. Sala, A. Locatelli, S.Gangopadhyay, J. T. Sadowski, S. D. Senanayake, and J. Falt, Growth and characterization of epitaxially stabilized ceria(001)  nanostructures on Ru(0001), Nanoscale 8, 10849 (2016).
  20. S. Choudhary, J. V. N. Sarma, and S. Gangopadhyay, Growth and characterization of single phase Cu2O by thermal oxidation of thin copper films, AIP Conf. Proc. 1724, 020116 (2016).
  21. P. Fageria, R. Nazir, S. Gangopadhyay, H. C. Barshilia, and S. Pande, Graphitic-carbon nitride support for the synthesis of shape-dependent ZnO and their application in visible light photocatalyst, RSC Adv. 5, 80397 (2015).
  22. A. Bhargava, N. Jain, S. Gangopadhyay, and J. Panwar, Synthesis, characterization and catalytic applications of gold nanoparticle based fungal bionanocatalyst, Process Biochemistry 50, 1293 (2015).
  23. A. K. Tiwari, S. Gangopadhyay, C. H. Chang, S. Pande, and S. Saha, Study on Metal Nanoparticles Synthesis and Orientation of Gemini Surfactant Molecules Used as Stabilizer, J. Colloid Interface Sci. 445, 76 (2015).
  24. S. Gangopadhyay, Th. Schmidt, C. Kruse, S. Figge, D. Hommel, and J. Falta, Surface oxidation of GaN(0001): Rf-nitrogen plasma-assisted cleaning for ultra-high vacuum applications , J. Vac. Sci. Technol. A 32, 051401 (2014).
  25. P. Fageria, S. Gangopadhyay, and S. Pande, Synthesis of ZnO/Au and ZnO/Ag nano-particles and their photocatalytic application using UV and visible light , RSC Adv. 4, 24962 (2014).
  26. R. Foulston, S. Gangopadhyay, C. Chiutu, P. Moriarty and R. G. Jones, Mono- and multi-layer adsorption of an ionic liquid on Au(110), Phys. Chem. Chem. Phys. 14, 6054 (2012).
  27. A. Sweetman, R. Danza, S. Gangopadhyay, and P. Moriarty, Imaging and manipulation of the Si(100) surface by small-amplitude NC-AFM at zero and very low applied bias, J. Phys. Condens. Matter 24, 084009 (2012).
  28. A. Sweetman, S. Jarvis, R. Danza, J. Bamidele, S. Gangopadhyay, G. A. Shaw, L. Kantorovich and P. Moriarty, Toggling Bistable Atoms via Mechanical Switching of Bond Angle, Phys. Rev. Lett. 106, 136101 (2011).
  29. J. Falta, Th. Schmidt, S. Gangopadhyay, C. Schulz, S. Kuhr, N. Berner, J. I. Flege, A. Pretorius, A. Rosenauer, K. Sebald, H. Lohmeyer, J. Gutowski, S. Figge, T. Yamaguchi, and D. Hommel, Cleaning and growth morphology of GaN and InGaN surfaces, Phys. Stat. Sol. (b) 248, 1800 (2011).
  30. J. Falta, Th. Schmidt, S. Gangopadhyay, T. Clausen, O. Brunke, J. I. Flege, S. Heun, S. Bernstoff, L. Gregoratti and M. Kiskinova, Ultra-thin high-quality silicon nitride films on Si(111)  Euro Phys. Lett. 94, 16003 (2011).
  31. Th. Schmidt, M. Siebert,J. I. Flege, S. Figge, S. Gangopadhyay, A Pretorius, T.-L. Lee, J. Zegenhagen, L. Gregoratti, A. Barinov, A Rosenauer, D. hommel and J. Falta, Mg and Si dopant incorporation and segregation in GaN, Phys. Stat. Sol. (b) 248, 1810  (2011).
  32. S. Das, R. K. Sinha, S. Manna, S. Gangopadhyay, A. Dhar and S. K. Ray, Microstructural, chemical bonding, stress development and charge storage characteristics of Ge nanocrystals embedded in hafnium oxide, J. Nanopart. Res. 13, 587 (2011).
  33. S. Das, R. K. Sinha, S. Gangopadhyay, A. Dhar and S. K. Ray, Microstructural characterization and phonon structures in luminescence from surface oxidized Genanocrystals embedded in HfO2 matrix, J. Appl. Phys. 108, 053510 (2010).
  34. S. Gangopadhyay, M. Yoshimura, and K. Ueda, Evolution of Ge nanoislands on Si(110)- '16 x 2' surface under thermal annealing studied using STM, Nanotechnology 20,475401(2009).
  35. S. Gangopadhyay, R. A. J. Woolley, R. Danza, M. A. Phillips, K. Schulte, Li Wang, V.R. Dhanak, and P. J. Moriarty, C60 submonolayers on the Si(111)-(7× 7) surface: Does a mixture of physisorbed and chemisorbed states exist? Surf. Sci. 603, 2896 (2009).
  36. A. Sweetman, S. Gangopadhyay, R. Danza, N. Berdunov, and P. Moriarty, qPlus atomic force microscopy of the Si(100) surface: Buckled, split-off, and added dimmers, Appl. Phys. Lett. 95, 63112 (2009).
  37. A. J. Pollard, R. R. Nair, S. N. Sabki, C. R Staddon, L. M. A. Perdigao, C. H. Hsu, S. Gangopadhyay, H. F. Gleeson A. K. Geim and P. H. Beton, Formation of monolayer graphene by annealing sacrificial nickel thin films, J. Phys. Chem. C 113, 16565 (2009).
  38. Th. Schmidt, J. I. Flege, M. Specmann, T. Clausen, S. Gangopadhyay, A. Locatelli, T. O. Mentes, S. Heun, F. Z. Guo,P. Sutter, and J. Falta, From nanoislands to nanowires: Growth of germanium on gallium-terminated silicon surfaces, Phys. Stat. Sol. (a) 206, 1718 (2009).
  39. S. Das, R. Singha, S. Gangopadhyay, A. Dhar, and S. K. Ray, Luminescence Fine Structures from Ge Nanocrystals Embedded in HfO2 Matrix, Sinep 2009. 1st International Workshop on Si Based Nano-Electronics and Photonics, 2, 939 (2009).
  40. A. Sweetman, P. Sharp, A. Stannard, S. Gangopadhyay, and P. J. Moriarty, AFM of Self-Organised Nanoparticle Arrays: Frequency Modulation, Amplitude Modulation, and Force Spectroscopy, Nanostructured Thin Films: Proc. of SPIE 7041, 704102, (2008).
  41. Th. Schmidt, J. I. Flege, S. Gangopadhyay, T. Clausen, A. Locatelli, S. Heun and J. Falta, Alignment of Ge nano- islands on Si(111) by Ga-induced substrate self-patterning, Phys. Rev. Lett. 98, 66104 (2007).
  42. S. Gangopadhyay, Th. Schmidt, S. Einfeldt, T. Yamaguchi, D. Hommel and J. Falta, Formation and morphology of InGaN nano-islands on GaN(0001), J. Vac. Sci. Technol. B 25, 791 (2007).
  43. S. Gangopadhyay, A. K. Kar, and B. K. Mathur, Shape of Field-Induced Nanostructures Formed by STM, Journal of Nanomaterials, vol. 2007, Article ID 36435, 5 pages, (2007).
  44. Th. Schmidt, T. Clausen, J. I. Flege, S. Gangopadhyay, A. Locatelli, T. O. Mentes, F. Z. Guo, S. Heun and J. Falta, Adsorbed induced self-ordering of germanium nanoislands on Si(113) , New. J. Phys. 9, 392 (2007).
  45. T. Yamaguchi, J. Dennemarck, C. Tessarek, K. Sebald, S. Gangopadhyay, J. Falta, J. Gutowski, S. Figge and D. Hommel, Two-step growth of InGaN quantum dots and application to light emitters, Phys. Stat. Sol. (c) 4, 2407 (2007).
  46. S. Gangopadhyay, Th. Schmidt and J. Falta, N-plasma assisted MBE grown GaN films on Si(111), Phys. Stat. Sol. (b) 243, 1416 (2006).
  47. S. Gangopadhyay, Th. Schmidt, S. Einfeldt, T. Yamaguchi, D. Hommel and J. Falta, Growth and morphology of MOVPE grown InGaN/GaN islands, Phys. Stat. Sol. (c) 3, 1557 (2006).
  48. S. Gangopadhyay, Th. Schmidt, S. Einfeldt, T. Yamaguchi, D. Hommel and J. Falta, Growth and morphology of MOVPE grown InGaNnano-islands studied by STM, Mater. Res. Soc. Symp. Proc. 892, FF32.5.1 (2006).
  49. S. Gangopadhyay, Th. Schmidt, S. Einfeldt, T. Yamaguchi, D. Hommel and J. Falta, Growth and formation of InGaN and GaNnano-structures studied by STM, e-J. Surf. Sci. Nanotech. 4, 90 (2006).
  50. S. Gangopadhyay, Th. Schmidt and J. Falta, Initial stage of silicon nitride nucleation on Si(111) by rf plasma- assisted growth, e-J. Surf. Sci. Nanotech., 4, 84 (2006).
  51. Th. Schmidt, M. Siebert, A. Pretorius, S. Gangopadhyay, S. Figge, J. I. Flege, L. Gregoratti, A. Barinov, D. Hommel, and J. Falta, Spectro-microscopy on Si doped GaN films, Nucl. Instr. Meth. B 246, 79 (2006).
  52. T. Yamaguchi, K. Sebald, H. Lohmeyer, S. Gangopadhyay, J. Falta, J. Gutowski and D. Hommel, A novel approach to growing InGaN quantum dots, Phys. Stat. Sol. (c) 3, 3955 (2006).
  53. T. Yamaguchi, S. Einfeldt, S. Gangopadhyay, A. Pretorius, A. Rosenauer, J. Falta and D. Hommel, Two to three dimensional transitions of InGaN and the impact of GaN overgrowth, Phys. Stat. Sol. (c) 3, 1396 (2006).
  54. Th. Schmidt, M. Siebert, J. I. Flege, S. Gangopadhyay, A. Pretorius, S. Figge, L. Gregoratti, A. Barinov, D. Hommel, and J. Falta, Surface segregation of Si and Mg dopants in MOVPE grown GaN films revealed by x-ray photoemission spectro-microscopy, Phys. Stat. Sol. (c) 3, 1725 (2006).
  55. Th. Schmidt, S. Gangopadhyay, J. I. Flege, T. Clausen, A. Locatelli, S. Heun and J. Falta, Self-organized 2D nanopatterns after low-coverage Ga adsorption on Si (111), New. J. Phys. 7, 193 (2005).
  56. S. Gangopadhyay, Th. Schmidt and J. Falta, Influence of substrate domain boundaries on surface reconstructions of Ga/Si(111) , Surf. Sci. 552, 63 (2004).
  57. L. Aballe, L.Gregoratti, A. Barinov, M. Kiskinova T. Clausen, S. Gangopadhyay and J. Falta, Interfacial interactions at Au/Si3N4/Si(111) and Ni/Si3N4/Si(111) structures with ultra-thin nitride films, Appl. Phys. Lett. 84, 5031 (2004).
  58. Th. Schmidt, T. Clausen, S. Gangopadhyay, J. Falta, S. Heun, L. Gregoratti, A. Barinov, B. Kaulich and M. Kiskinova, Spectro-microscopy of ultra-thin SiN films on Si(111), Nucl. Instr. Meth. B 200, 79 (2003).
  59. S. Gangopadhyay, A. K. Kar, S. K. Ray and B. K. Mathur, An inexpensive up-gradation of scanning tunneling microscope for ballistic electron emission microscopy and spectroscopy, Appl. Surf. Sci. 156, 183-188 (2000).
  60. A. K. Kar, S. Gangopadhyay, and B. K. Mathur, A reverse electrochemical floating-layer technique of SPM tip preparation, Meas. Sci. Technol. 11, 1426 (2000).
  61. S. Gangopadhyay, S Kasiviswanathan and B. K. Mathur, Characterization of Gold/n-silicon interface using Ballistic Electron Emission Microscope, Proc. of SPIE 3975, 367, (2000). 

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