Facile Diamond Synthesis From Diamondoids

Wednesday, July 15, 2020 - 3:00pm

Virtual Photon Science Seminar

Speaker: Yu Lin, SLAC

Program Description:

Carbon-based nanomaterials have exceptional properties that make them attractive for a variety of technological applications. In this talk, I will discuss 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, lower diamondoid-to-diamond conversion occurs rapidly within < 19 ms, forming diamond in a range of sizes ~tens of nm to ~4 mm 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 full sp3 hybridization of diamondoids and bulk diamond. The facile synthesis of diamond suggests a promising use of diamondoids for investigating light emitting defects in diamonds, which is of significant interest in the fields ranging from quantum technologies to biological sciences.

 

Facile Diamond Synthesis From Diamondoids
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