Abstract
We provide insights pertaining the dependence of undercooling in the formation of graphite, nanodiamonds, and Q-carbon nanocomposites by nanosecond laser melting of diamond-like carbon (DLC). The DLC films are melted rapidly in a super-undercooled state and subsequently quenched to room temperature. Substrates exhibiting different thermal properties-silicon and sapphire, are used to demonstrate that substrates with lower thermal conductivity trap heat flow, inducing larger undercooling, both experimentally and theoretically via finite element simulations. The increased undercooling facilitates the formation of Q-carbon. The Q-carbon is used as nucleation seeds for diamond growth via laser remelting and hot-filament chemical vapor deposition.
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Acknowledgment
We are thankful to the Fan Family Foundation Distinguished Chair Endowment for J. Narayan. R. Sachan acknowledges National Academy of Sciences (NAS), USA for awarding the NRC research fellowship. This work was performed under the National Science Foundation Award number DMR-1735695. We used Analytical Instrumentation Facility (AIF) at North Carolina State University for performing the structural characterization of thin films.
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Gupta, S., Sachan, R., Bhaumik, A. et al. Undercooling driven growth of Q-carbon, diamond, and graphite. MRS Communications 8, 533–540 (2018). https://doi.org/10.1557/mrc.2018.76
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DOI: https://doi.org/10.1557/mrc.2018.76