Facile diamond synthesis from lower diamondoids

ORAL

Abstract

Carbon-based nanomaterials have exceptional properties that make them attractive for a variety of technological applications. In this talk, I discuss the use of diamondoids (diamond-like hydrocarbons) as promising precursors for laser-induced high-pressure, high-temperature diamond synthesis. The lowest pressure and temperature (P-T) conditions that yielded diamond were 12 GPa (at ~2000 K) and 900 K (at ~20 GPa), respectively. This represents a significantly reduced transformation barrier compared with diamond synthesis from conventional (hydro)carbon allotropes. At 20 GPa, diamondoid-to-diamond conversion occurs rapidly within < 19 us, forming diamond in a range of sizes ~tens of nm to ~4 um crystals, depending on the synthesis conditions. Molecular dynamics simulations indicate that once dehydrogenated, the remaining diamondoid carbon cages reconstruct themselves into diamond-like structures at high P-T. The surprisingly low P-T regime necessary to grow diamond from diamondoids is attributed to the similarities in the structure and bonding of diamondoids and bulk diamond. This study is the first successful mapping of the P-T conditions and onset timing of the diamondoid-to-diamond conversion and elucidates the physical and chemical factors that facilitate diamond synthesis.

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Presenters

  • Yu Lin

    • Stanford University
    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory

Authors

  • Sulgiye Park

    • Stanford University

  • Iwnetim I Abate

    • Stanford University

  • Jin Liu

    • Center for High Pressure Science and Technology Advanced Research

  • Chenxu Wang

    • Stanford University
    • Stanford Univ

  • Jeremy Dahl

    • SLAC - Natl Accelerator Lab

  • Robert Carlson

    • SLAC - Natl Accelerator Lab

  • Yang Liuxiang

    • Center for High Pressure Science and Technology Advanced Research

  • Vitali Prakapenka

    • Center for Advanced Radiation Sources, University of Chicago
    • GSECARS, University of Chicago
    • Center for Advanced Radiation Sources
    • Center for Advanced Radiation Source, University of Chicago

  • Eran Greenberg

    • Center for Advanced Radiation Sources

  • Thomas Devereaux

    • Stanford Univ
    • Materials Science and Engineering, Stanford University
    • Stanford University
    • SLAC National Accelerator Laboratory
    • Photon Sciences, Stanford Linear Accelerator (SLAC)
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
    • SLAC National Accelerator Lab.

  • Chunjing Jia

    • SLAC National Accelerator Laboratory
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
    • SLAC National Accelerator Lab.
    • SLAC - Natl Accelerator Lab
    • Stanford University

  • Rodney C. Ewing

    • Stanford University
    • Stanford Univ

  • Wendy Mao

    • Stanford University
    • Stanford Univ

  • Yu Lin

    • Stanford University
    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory