Cola, Baratunde A.

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    Highly specular carbon nanotube absorbers
    (Georgia Institute of Technology, 2010-10) Wang, X. J. ; Wang, L. P. ; Adewuyi, O. S. ; Cola, Baratunde A. ; Zhang, Zhuomin ; Georgia Institute of Technology. Center for Organic Photonics and Electronics ; Georgia Institute of Technology. School of Mechanical Engineering
    Specular black materials have important applications, such as in absolute cryogenic radiometers, space-borne spectroradiometers, and some energy conversion devices. While vertically aligned carbon nanotubes (VACNT) can have close-to-unity absorptance, so far the reported reflection has been essentially diffuse. This letter describes a highly specular black absorber made of VACNT. Both the bidirectional reflectance distribution function and specular reflectance were measured at the wavelength λ = 635 nm using a laser scatterometer. The ordinary and extraordinary optical constants were obtained by fitting the specular reflectance, calculated from modified reflectance formulae for light incident from air to a uniaxial medium, considering surface roughness. Furthermore, the absorptance at λ = 635 nm was shown to be 0.994±0.002, based on the measured directional-hemispherical reflectance.
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    Nitrogen- and Boron-Doped Carbon Nanotube Electrodes in a Thermo-Electrochemical Cell
    (Georgia Institute of Technology, 2012) Salazar, Pablo F. ; Kumar, Satish ; Cola, Baratunde A. ; Georgia Institute of Technology. Center for Organic Photonics and Electronics
    We explore the prospects of using doped carbon nanotube (CNT) electrodes to increase the output power of thermo-electrochemical cells (TECs). CNT buckypaper electrodes doped with nitrogen and boron were characterized using cyclic voltammetry, impedance spectroscopy, and TEC test with potassium ferri/ferrocyanide electrolyte. Both doping states increased the electrochemically active surface area of CNT electrodes. Electrostatic interactions with potassium ions altered the charge transfer kinetics for doped CNT electrodes; yet, the symmetry of the charge transfer remained approximately equal to that of pristine CNTs. In TEC test, accumulation of potassium ions at doped CNT electrodes was found to reduce short-circuit current.
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    Conformally coating vertically aligned carbon nanotube arrays using thermal decomposition of iron pentacarbonyl
    (Georgia Institute of Technology, 2012-05) Hildreth, Owen ; Cola, Baratunde A. ; Graham, Samuel ; Wong, C. P. ; Georgia Institute of Technology. Center for Organic Photonics and Electronics
    Conformally coating vertically aligned carbon nanotubes (v-CNT) with metals or oxides can be difficult because standard line-of-sight deposition methods, such as dc sputter coating and electron-beam evaporation, are hindered by the low mean-free-path with