JNCiR :: JNCASR Institutional Repository: Recent submissions

  • Graphene: Synthesis, Functionalization and Properties 
    Rao, C N R; Subrahmanyam, K S; Matte, H S S Ramakrishna; Govindaraj, A (World Scientific Publishing Co PTE Ltd, 2011-03-20)
    Graphenes with varying number of layers can be synthesized by different strategies. Thus, single-layer graphene is obtained by the reduction of single layer graphene oxide, CVD and other methods besides micromechanical ...
  • Pressure-induced reversible transformation in single-wall carbon nanotube bundles studied by Raman spectroscopy 
    Teredesai, Pallavi V; Sood, A K; Muthu, D V S; Sen, R; Govindaraj, A; Rao, C N R (Elsevier Science BV, 2000-03-17)
    We report our high-pressure Raman studies on single-wall carbon nanotube bundles carried out up to 25.9 GPa. The intensity of the radial modes decreases more drastically as compared to that of the tangential modes. The ...
  • Science and technology of nanomaterials: current status and future prospects 
    Rao, C N R; Cheetham, A K (Royal Society of Chemistry, 2001)
    The science and technology of nanomaterials has created great excitement and expectations in the last few years. By its very nature, the subject is of immense academic interest, having to do with very tiny objects in the ...
  • Simple Synthesis of MoS2 and WS2 Nanotubes 
    Nath, Manashi; Govindaraj, Achutharao; Rao, C N R (WILEY-VCH Verlag GmbH, 2001-02-19)
    Trisulfide molybdenum complexes have been employed to produce nanotubes by simple heating in a stream of hydrogen. Bamboo-like stacking (see Figure) was observed, suggesting that the stimulus for the growth of MoS2 nanotubes ...
  • Ferromagnetism Exhibited by Nanoparticles of Noble Metals 
    Maitra, Urmimala; Das, Barun; Kumar, Nitesh; Sundaresan, Athinarayanan; Rao, C N R (Wiley-Blackwell, 2011-08-22)
    Gold nanoparticles with average diameters in the range 2.515 nm, prepared at the organic/aqueous interface by using tetrakis( hydroxymethyl) phosphonium chloride (THPC) as reducing agent, exhibit ferromagnetism whereby the ...
  • Vortex shedding patterns, their competition, and chaos in flow past inline oscillating rectangular cylinders 
    T, Srikanth; Dixit, Harish N; Tatavarti, Rao; Govindarajan, Rama (American Institute of Physics, 2011-07)
    The flow past inline oscillating rectangular cylinders is studied numerically at a Reynolds number representative of two-dimensional flow. A symmetric mode, known as S-II, consisting of a pair of oppositely signed vortices ...
  • Optical limiting in single-walled carbon nanotube suspensions 
    Mishra, S R; Rawat, H S; Mehendale, S C; Rustagi, K C; Sood, A K; Bandyopadhyay, Ranjini; Govindaraj, A; Rao, C N R (Elsevier Science BV, 2000-01-04)
    Optical limiting behaviour of suspensions of single-walled carbon nanotubes in water, ethanol and ethylene glycol is reported. Experiments with 532 nm, 15 ns duration laser pulses show that optical limiting occurs mainly ...
  • Synthesis, characterization and spectroscopy of composites of graphene with CdSe and CdS nanoparticles 
    Moses, Kota; Panchakarla, L S; Matte, H S S Ramakrishna; Govindarao, Bolla; Rao, C N R (National Institute of Science Communication and Information Resources, 2011-09)
    Nanocomposites of few-layer graphene with nanoparticles of CdSe and CdS have been synthesized by two different methods, one involving ultrasonication of a mixture of graphene and the chalcogenide nanoparticles, and another ...
  • Stability of a vortex in radial density stratification: role of wave interactions 
    Dixit, Harish N; Govindarajan, Rama (Cambridge University Press, 2011-07)
    We study the stability of a vortex in an axisymmetric density distribution. It is shown that a light-cored vortex can be unstable in spite of the 'stable stratification' of density. Using a model flow consisting of step ...
  • Production of bundles of aligned carbon and carbon-nitrogen nanotubes by the pyrolysis of precursors on silica-supported iron and cobalt catalysts 
    Nath, Manashi; Satishkumar, B C; Govindaraj, A; Vinod, C P; Rao, C N R (Elsevier Science BV, 2000-05-26)
    Pyrolysis of acetylene over iron or cobalt nanoparticles well dispersed on silica substrates gives copious yields of aligned carbon nanotube bundles. By carrying out the pyrolysis of pyridine over these catalyst surfaces, ...
  • Y-junction carbon nanotubes 
    Satishkumar, B C; Thomas, PJohn; Govindaraj, A; Rao, C N R (American Institute of Physics, 2000-10-16)
    Carbon nanotubes with junctions are considered to be of potential value in nanoelectronics. A simple pyrolysis procedure for producing Y-junction carbon nanotubes is described. The method involves the pyrolysis of the ...
  • Pressure Effects on Single Wall Carbon Nanotube Bundles 
    Teredesai, P V; Sood, A K; Sharma, S M; Karmakar, S; Sikka, S K; Govindaraj, A; Rao, C N R (WILEY-VCH Verlag GmbH, 2001-01)
    We report high pressure Raman studies on single wall carbon nanotube bundles under hydrostatic conditions using two different pressure transmitting media, alcohol mixture and pure water. The radial and tangential modes ...
  • The structure of two new non-centrosymmetric phases of oxygen deficient bismuth manganite 
    Eggeman, A S; Sundaresan, A; Rao, C N R; Midgley, P A (Royal Society of Chemistry, 2011)
    The structure of two new phases in the bismuth manganite system are reported. The phases were determined by electron diffraction studies of two oxygen-deficient bulk samples. The first phase, a minority component of bulk ...
  • Synthesis of metal oxide nanorods using carbon nanotubes as templates 
    Satishkumar, B C; Govindaraj, A; Nath, Manashi; Rao, C N R (Royal Society of Chemistry, 2000)
    Nanorods of several oxides, with diameters in the range of 10-200 nm and lengths upto a few microns, have been prepared by templating against carbon nanotubes. The oxides include V2O5, WO3, MoO3 and Sb2O5 as well as metallic ...
  • Global instabilities in diverging channel flows 
    Swaminathan, Gayathri; Sahu, Kirti Chandra; Sameen, A; Govindarajan, Rama (Springer, 2011-06)
    A global stability study of a divergent channel flow reveals features not obtained hitherto by making either the parallel or the weakly non-parallel (WNP) flow assumption. A divergent channel flow is chosen for this study ...
  • Brillouin scattering from C-70 and C-60 films: a comparative study of elastic properties 
    Murugavel, P; Narayana, Chandrabhas; Govindaraj, A; Sood, Ajay K; Rao, C N R (Elsevier Science BV, 2000-12-01)
    Brillouin scattering measurements carried out on a thin film of C-70 deposited on a Si(100) substrate show modes at 4.8 and 25 GHz due to the surface Rayleigh wave and the bulk longitudinal acoustic mode, respectively, the ...
  • Magic Nuclearity Giant Clusters of Metal Nanocrystals Formed by Mesoscale Self-Assembly 
    Thomas, P John; Kulkarni, G U; Rao, C N R (American Chemical Society, 2001-04-05)
    Magic nuclearity giant clusters formed by the mesoscale self-assembly of Pd nanocrystals of 2.5 nm diameter (nuclearity, similar to 561) have been identified by transmission electron microscopy. The clusters have discrete ...
  • Nanotubes 
    Rao, C N R; Satishkumar, B C; Govindaraj, A; Nath, Manashi (WILEY-VCH Verlag GmbH, 2001-02-16)
    Carbon nanotubes were discovered soon after the successful laboratory synthesis of fulferenes. Since their discovery in 1997, there has been intensive research activity in the area of carbon nanotubes, not only because of ...
  • Metal-coated magnetic nanoparticles for surface enhanced Raman scattering studies 
    Kumar, G V Pavan; Rangarajan, N; Sonia, B; Deepika, P; Rohman, Nashiour; Narayana, Chandrabhas (Indian Academy of Sciences, 2011-04)
    We report the optimization and usage of surfactantless, water dispersible Ag and Au-coated gamma-Fe(2)O(3) nanoparticles for applications in surface-enhanced Raman scattering (SERS). These nanoparticles, with plasmonic as ...
  • Surfactant-assisted synthesis of semiconductor nanotubes and nanowires 
    Rao, C N R; Govindaraj, A; Deepak, F Leonard; Gunari, N A; Nath, Manashi (American Institute of Physics, 2001-03-26)
    Nanotubes and nanowires of CdSe and CdS have been obtained from solutions containing a surfactant such as Triton 100-X. They have been characterized by x-ray diffraction, electron microscopy, and optical spectroscopy. (C) ...

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