Facile diamond synthesis from lower diamondoids

ORAL

Abstract

Carbon-based nanomaterials have exceptional properties that make them attractive for a variety of technological applications. Here, we report on the use of diamondoids (diamond-like, saturated 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. 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 full sp3 hybridization 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

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

Authors

  • Sulgiye Park

    • Stanford University

  • Iwnetim I Abate

    • Stanford University
    • Stanford Univ

  • Jin Liu

    • Center for High Pressure Science and Technology Advanced Research

  • Chenxu Wang

    • Stanford University

  • Jeremy Dahl

    • SLAC - Natl Accelerator Lab

  • Robert Carlson

    • SLAC - Natl Accelerator Lab

  • Liuxiang Yang

    • Center for High Pressure Science and Technology Advanced Research

  • Vitali B. Prakapenka

    • Center for Advanced Radiation Sources, University of Chicago
    • GSECARS, University Of Chicago
    • University of Chicago
    • CARS, University of Chicago
    • Center for Radiation Sources, University of Chicago

  • Eran Greenberg

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

  • Thomas Devereaux

    • Stanford Univ
    • SLAC, Stanford
    • Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University
    • SIMES, SLAC
    • SLAC

  • Chunjing Jia

    • SLAC - Natl Accelerator Lab
    • SIMES, SLAC

  • Rodney Ewing

    • Stanford University

  • Wendy Mao

    • Stanford University
    • Stanford Univ

  • Yu Lin

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