Leonid Grigorian

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X. Fan,1,2 E. C. Dickey,1,* P. C. Eklund,3,† K. A. Williams,3 L. Grigorian,3,‡ R. Buczko,2,4,§ S. T. Pantelides,4,2 and S. J. Pennycook2 1Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506 2Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 3Department of Physics and Astronomy,(More)
P. T. Araujo,1 I. O. Maciel,1 P. B. C. Pesce,1 M. A. Pimenta,1 S. K. Doorn,2 H. Qian,3 A. Hartschuh,3 M. Steiner,4 L. Grigorian,5 K. Hata,6 and A. Jorio1,7 1Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30123-970 Brazil 2Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA(More)
L. Grigorian,1,2 K. A. Williams,1 S. Fang,1,2 G. U. Sumanasekera,1 A. L. Loper,1 E. C. Dickey,3 S. J. Pennycook,4 and P. C. Eklund1,2 1Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 2Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511 3Department of Chemical(More)
Sensors containing metal-carbon nanotube (CNT) hybrid materials as the active sensing layer were demonstrated for ethanol vapor detection at room temperature. The metal-CNT hybrid materials were synthesized by infiltrating single wall carbon nanotubes (SWNTs) with the transition metals Ti, Mn, Fe, Co, Ni, Pd or Pt. Each sensor was prepared by drop-casting(More)
The electrical transport properties of single-wall carbon nanotubes are shown to be strongly influenced by the presence of transition-metal impurities derived from the catalyst introduced to stimulate their growth. Data on thermoelectric power and electrical resistance in the temperature range 10–400 K were obtained on a series of samples prepared using M(More)
Room-temperature Raman-scattering spectra are reported for the type-II superconductors MxBaySi46 ~M 5Na,K! that were recently shown to exhibit Tc’s ;3.5 K. These spectra are compared to those of Na8Si46 and K7Si46 clathrates that exhibit normal metallic behavior down to 2 K. In the Si46 system, fifteen of the eighteen Si related first-order Raman(More)
Carbon single-wall nanotubes (SWNTs) grow efficiently from methane on alumina-supported metal catalysts within a fairly narrow temperature window from 680 to 850 °C. An abrupt onset in SWNT growth occurs at the low temperature side of the window, and SWNTs produced at these lower temperatures appear to be relatively free of amorphous or nanocrystalline(More)
The action of heart factor H1 on the synthesis and uptake of dopamine and noradrenaline in the atria and ventricle of rat heart and also the participation of Ca2+ and ATP in the action of H1 was studied. It has been shown, that H1 in the doses of 2 and 20 mU/ml increases the synthesis of 14C-dopamine in the atria by 43-44% and does not effect on this(More)