Search Results - "GEOHEGAN, D. B"

In situ measurements and modeling of carbon nanotube array growth kinetics during chemical vapor deposition by PURETZKY, A. A, GEOHEGAN, D. B, JESSE, S, IVANOV, I. N, ERES, G

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Revealing the surface and bulk regimes of isothermal graphene nucleation and growth on Ni with in situ kinetic measurements and modeling by Puretzky, A.A., Merkulov, I.A., Rouleau, C.M., Eres, G., Geohegan, D.B.

“…In situ optical diagnostics are used to reveal the isothermal nucleation and growth kinetics of graphene on Ni across a wide temperature range (560°C<T<840°C)…”
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Model for Self-Assembly of Carbon Nanotubes from Acetylene Based on Real-Time Studies of Vertically Aligned Growth Kinetics by Eres, Gyula, Rouleau, C. M, Yoon, Mina, Puretzky, A. A, Jackson, J. J, Geohegan, D. B

“…Time-resolved optical reflectivity was used to study the kinetics in the early stages of vertically aligned carbon nanotube array growth from a molecular beam…”
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Synthesis of Novel Thin-Film Materials by Pulsed Laser Deposition by Lowndes, Douglas H., Geohegan, D. B., Puretzky, A. A., Norton, D. P., Rouleau, C. M.

“…Pulsed laser deposition (PLD) is a conceptually and experimentally simple yet highly versatile tool for thin-film and multilayer research. Its advantages for…”
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Nucleation of single-walled carbon nanotubes by Fan, X, Buczko, R, Puretzky, A A, Geohegan, D B, Howe, J Y, Pantelides, S T, Pennycook, S J

“…The nucleation pathway for single-wall carbon nanotubes on a metal surface is demonstrated by a series of total energy calculations using density functional…”
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Rapid Growth of Long, Vertically Aligned Carbon Nanotubes through Efficient Catalyst Optimization Using Metal Film Gradients by Christen, H. M, Puretzky, A. A, Cui, H, Belay, K, Fleming, P. H, Geohegan, D. B, Lowndes, D. H

“…Pulsed laser deposited, orthogonally overlapping metal film gradients are introduced as a versatile method to optimize desired nanomaterial characteristics…”
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In situ control of the catalyst efficiency in chemical vapor deposition of vertically aligned carbon nanotubes on predeposited metal catalyst films by Eres, Gyula, Puretzky, A. A., Geohegan, D. B., Cui, H.

“…Premature termination of growth, presumably because of catalyst deactivation, is an undesirable side effect of chemical vapor deposition of vertically aligned…”
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Cumulative and continuous laser vaporization synthesis of single wall carbon nanotubes and nanohorns by Puretzky, A. A., Styers-Barnett, D. J., Rouleau, C. M., Hu, H., Zhao, B., Ivanov, I. N., Geohegan, D. B.

“…The conditions for the scaled synthesis of single wall carbon nanotubes (SWNTs) and single wall carbon nanohorns (SWNHs) by laser vaporization at high…”
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In situ growth rate measurements and length control during chemical vapor deposition of vertically aligned multiwall carbon nanotubes by Geohegan, D. B., Puretzky, A. A., Ivanov, I. N., Jesse, S., Eres, G., Howe, J. Y.

“…Time-resolved reflectivity is employed as an in situ diagnostic in thermal chemical vapor deposition of vertically aligned arrays of multiwall carbon nanotubes…”
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Growth behavior of carbon nanotubes on multilayered metal catalyst film in chemical vapor deposition by Cui, H., Eres, G., Howe, J.Y., Puretkzy, A., Varela, M., Geohegan, D.B., Lowndes, D.H.

“…The temperature and time dependences of carbon nanotube (CNT) growth by chemical vapor deposition are studied using a multilayered Al/Fe/Mo catalyst on silicon…”
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The effect of annealing on the electrical and thermal transport properties of macroscopic bundles of long multi-wall carbon nanotubes by Jin, R., Zhou, Z.X., Mandrus, D., Ivanov, I.N., Eres, G., Howe, J.Y., Puretzky, A.A., Geohegan, D.B.

“…Electrical resistivity, thermal conductivity and thermoelectric power were measured on macroscopic bundles of long multi-wall carbon nanotubes (CNTs) in the…”
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In situ imaging and spectroscopy of single-wall carbon nanotube synthesis by laser vaporization by Puretzky, A. A., Geohegan, D. B., Fan, X., Pennycook, S. J.

“…The synthesis of single-wall carbon nanotubes by Nd:YAG laser vaporization of a graphite/(Ni, Co) target is investigated by laser-induced luminescence imaging…”
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Characterization of thin-film amorphous semiconductors using spectroscopic ellipsometry by Jellison, G.E., Merkulov, V.I., Puretzky, A.A., Geohegan, D.B., Eres, G., Lowndes, D.H., Caughman, J.B.

“…Spectroscopic ellipsometry (SE) has been used to routinely characterize amorphous silicon nitride and diamond thin films. Since SE measurements do not yield…”
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In situ time-resolved measurements of carbon nanotube and nanohorn growth by Geohegan, D. B., Puretzky, A. A., Styers-Barnett, D., Hu, H., Zhao, B., Cui, H., Rouleau, C. M., Eres, G., Jackson, J. J., Wood, R. F., Pannala, S., Wells, J. C.

“…Growth mechanisms of carbon nanotubes are investigated and compared for both high‐ and low‐temperature synthesis methods through experiments utilizing…”
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Dynamics of Plume Propagation and Splitting during Pulsed-Laser Ablation by Wood, R. F., Chen, K. R., Leboeuf, J. N., Puretzky, A. A., Geohegan, D. B.

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Nanoparticle generation and transport resulting from femtosecond laser ablation of ultrathin metal films: Time-resolved measurements and molecular dynamics simulations by Rouleau, C. M., Shih, C.-Y., Wu, C., Zhigilei, L. V., Puretzky, A. A., Geohegan, D. B.

“…The synthesis of metal nanoparticles by ultrafast laser ablation of nanometers-thick metal films has been studied experimentally and computationally…”
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Imaging of Vapor Plumes Produced by Matrix Assisted Laser Desorption: A Plume Sharpening Effect by Puretzky, A. A., Geohegan, D. B., Hurst, G. B., Buchanan, M. V., Luk'yanchuk, B. S.

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Slowing of femtosecond laser-generated nanoparticles in a background gas by Rouleau, C. M., Puretzky, A. A., Geohegan, D. B.

“…The slowing of Pt nanoparticles in argon background gas was characterized by Rayleigh scattering imaging using a plume of nanoparticles generated by…”
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Directed Integration of Tetracyanoquinodimethane-Cu Organic Nanowires into Prefabricated Device Architectures by Xiao, K., Ivanov, I. N., Puretzky, A. A., Liu, Z., Geohegan, D. B.

“…Single‐crystal nanowires of the organic semiconductor tetracyanoquinodimethane‐Cu (TCNQ‐Cu) are directly integrated into prefabricated microelectrode…”
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Simple model of the interrelation between single- and multiwall carbon nanotube growth rates for the CVD process by Wood, R. F., Pannala, S., Wells, J. C., Puretzky, A. A., Geohegan, D. B.

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