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  1. Article

    Open Access

    Extended anharmonic collapse of phonon dispersions in SnS and SnSe

    The lattice dynamics and high-temperature structural transition in SnS and SnSe are investigated via inelastic neutron scattering, high-resolution Raman spectroscopy and anharmonic first-principles simulations...

    T. Lanigan-Atkins, S. Yang, J. L. Niedziela, D. Bansal, A. F. May… in Nature Communications (2020)

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  2. No Access

    Chapter

    All Carbon Nanotubes Are Not Created Equal

    This chapter presents the various factors that enter into consideration when choosing the source of carbon nanotubes for a specific application. Carbon nanotubes are giant molecules made of pure carbon. They h...

    Gyula Eres, D.B. Geohegan, A.A. Puretzky… in Nanotechnology for Electronics, Photonics,… (2010)

  3. No Access

    Article

    Pulsed laser CVD investigations of single-wall carbon nanotube growth dynamics

    The nucleation and rapid growth of single-wall carbon nanotubes (SWNTs) were explored by pulsed-laser assisted chemical vapor deposition (PLA-CVD). A special high-power, Nd:YAG laser system with tunable pulse ...

    Z. Liu, D. J. Styers-Barnett, A. A. Puretzky, C. M. Rouleau, D. Yuan… in Applied Physics A (2008)

  4. No Access

    Article

    Altering the catalytic activity of thin metal catalyst films for controlled growth of chemical vapor deposited vertically aligned carbon nanotube arrays

    The growth rate and terminal length of vertically aligned carbon nanotube arrays (VANTAs) grown by chemical vapor deposition have been dramatically improved through pulsed KrF excimer laser pretreatments of mu...

    C. M. Rouleau, G. Eres, H. Cui, H. M. Christen, A. A. Puretzky… in Applied Physics A (2008)

  5. No Access

    Article

    Cumulative and continuous laser vaporization synthesis of single wall carbon nanotubes and nanohorns

    The conditions for the scaled synthesis of single wall carbon nanotubes (SWNTs) and single wall carbon nanohorns (SWNHs) by laser vaporization at high temperatures are investigated and compared using in situ d...

    A. A. Puretzky, D. J. Styers-Barnett, C. M. Rouleau, H. Hu, B. Zhao… in Applied Physics A (2008)

  6. No Access

    Article

    In situ measurements and modeling of carbon nanotube array growth kinetics during chemical vapor deposition

    Direct measurements of carbon nanotube growth kinetics are described based upon time-resolved reflectivity (TRR) of a HeNe laser beam from vertically aligned nanotube arrays (VANTAs) as they grow during chemic...

    A.A. Puretzky, D.B. Geohegan, S. Jesse, I.N. Ivanov, G. Eres in Applied Physics A (2005)

  7. No Access

    Article

    Dynamics of single-wall carbon nanotube synthesis by laser vaporization

    The key spatial and temporal scales for single-wall carbon nanotube (SWNT) synthesis by laser vaporization at high temperatures are investigated with laser-induced luminescence imaging and spectroscopy. Graphi...

    A.A. Puretzky, D.B. Geohegan, X. Fan, S.J. Pennycook in Applied Physics A (2000)

  8. No Access

    Article

    Mechanisms of Single-Wall Carbon Nanotube Growth by the Laser Vaporization Technique: In Situ Imaging and Spectroscopy

    Single-wall carbon nanotubes are formed by Nd:YAG laser vaporization of a graphite/(1 at. % Ni, 1 at. % Co) target into flowing argon (500 Torr) within a quartz tube furnace (1000 °C). Here, this process is in...

    D. B. Geohegan, A. A. Puretzky, X. Fan, M. A. Guillorn… in MRS Online Proceedings Library (1999)

  9. No Access

    Article

    Characterization of Pulsed-Laser Deposited Amorphous Diamond Films by Spectroscopic Ellipsometry

    Spectroscopic ellipsometry is used to characterize amorphous diamond, also known as tetrahedral amorphous carbon, (ta-C) films grown by pulsed laser ablation. The ellipsometry data is collected with the two-mo...

    G. E. Jellison Jr., D. B. Geohegan, D. H. Lowndes… in MRS Online Proceedings Library (1998)

  10. No Access

    Article

    In Situ Diagnostics of Nanomaterial Synthesis by Laser Ablation: Time-resolved Photoluminescence Spectra and Imaging of Gas-Suspended Nanoparticles Deposited for Thin Films

    The dynamics of nanoparticle formation by laser ablation into background gases are revealed by gated-ICCD photography of photoluminescence (PL) and Rayleigh-scattering (RS) from gas-suspended nanoparticles. Th...

    D. B. Geohegan, A. A. Puretzky, A. Meldrum, G. Duscher… in MRS Online Proceedings Library (1998)

  11. No Access

    Article

    Amorphous Diamond Films Deposited by Pulsed-Laser Ablation: The Optimum Carbon-Ion Kinetic Energy and Effects of Laser Wavelength

    A systematic study has been made of changes in the bonding and optical properties of hydrogen-free tetrahedral amorphous carbon (ta-C) films, as a function of the kinetic energy of the incident carbon ions mea...

    Douglas H. Lowndes, Vladimir I. Merkulov, A. A. Puretzky… in MRS Online Proceedings Library (1998)

  12. No Access

    Article

    Time-Resolved Imaging and Photoluminescence of Gas-Suspended Nanoparticles Synthesized by Laser Ablation: Dynamics, Transport, Collection, and Ex Situ Analysis

    The dynamics of gas phase nanoparticle formation by pulsed laser ablation into background gases are revealed by imaging photoluminescence and Rayleigh-scattered light from gas-suspended SiOx nanoparticles followi...

    D. B. Geohegan, A. A. Puretzky, G. Duscher… in MRS Online Proceedings Library (1998)

  13. No Access

    Article

    Vapor Breakdown During ablation by Nanosecond Laser Pulses

    ArF excimer laser-induced photolytic chemical vapor deposition of W on etched Si substrates using tungsten hexafluoride has been studied. Our experimental results show that tungsten film thickness is proportio...

    C. L. Liu, J. N. Leboeuf, R. F. Wood, D. B. Geohegan… in MRS Online Proceedings Library (1995)

  14. No Access

    Article

    Effect of Ambient Gas Pressure on Pulsed Laser Ablation Plume Dynamics and ZnTe Film Growth

    Epitaxial thin films of nitrogen-doped p-ZnTe were grown on single-crystal, semi-insulating GaAs substrates via pulsed laser ablation of a stoichiometric ZnTe target. Both low pressure nitrogen ambients and hi...

    C. M. Rouleau, D. H. Lowndes, M. A. Strauss, S. Cao… in MRS Online Proceedings Library (1995)

  15. No Access

    Article

    Amorphous Diamond-Like Carbon Film Growth by KrF-and ArF-Excimer Laser PLD: Correlation with Plume Properties

    Boron nitride films grown by ion-assisted pulsed laser deposition have been characterized by infrared absorption, auger electron pectroscopy, and transmission electron microscopy. Elemental bonding and the cry...

    A. A. Puretzky, D. B. Geohegan, G. E. Jellison Jr.… in MRS Online Proceedings Library (1995)

  16. No Access

    Article

    Dynamical Modeling of Laser ablation Processes

    The energy distributions of positive ions produced by exposing single-crystal MgO to pulsed 248 nm excimer laser light at fluences of 200-1200 mJ/cm2 were determined by combined quadrupole mass spectrometry and t...

    J. N. Leboeuf, K. R. Chen, J. M. Donato, D. B. Geohegan‡… in MRS Online Proceedings Library (1995)

  17. No Access

    Article

    Laser-Solid Interaction and Dynamics of the Laser-Ablated Materials

    Planar laser-induced fluorescence has been used to acquire time sequence images of ground-state, neutral Si and SiO during laser ablation of an Si target in vacuum and in the presence of a background gas at a ...

    K. R. Chen, J. N. Leboeuf, D. B. Geohegan, R. F. Wood… in MRS Online Proceedings Library (1995)

  18. No Access

    Article

    Pulsed Laser Ablation Growth and Do** of Epitaxial Compound Semiconductor Films

    Pulsed laser ablation (PLA) has several characteristics that are potentially attractive for the growth and do** of chemically complex compound semiconductors including (1) stoichiometric (congruent) transfer...

    Douglas H. Lowndes, Christopher M. Rouleau… in MRS Online Proceedings Library (1995)

  19. No Access

    Article

    Modeling of Thermal, Electronic, Hydrodynamic, and Dynamic Deposition Processes for Pulsed-Laser Deposition of Thin Films

    Various physical processes during laser ablation of solids for pulsed-laser deposition (PLD) are studied using a variety of computational techniques. In the course of our combined theoretical and experimental ...

    C. L. Liu, J. N. Leboeuf, R. F. Wood, D. B. Geohegan… in MRS Online Proceedings Library (1994)

  20. No Access

    Article

    Comments on small superconducting clusters

    The feasibility of an experimental study of small superconducting clusters (SC) is analyzed. Critical sizes for SC are calculated. Oscillations of the energy gap and the diamagnetic susceptibility of SC are co...

    A. L. Dobryakov, Yu. E. Lozovik, A. A. Puretzky, V. S. Letokhov in Applied Physics A (1992)

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