Graphite to diamond phase transition induced by UV radiation

Ana I. Gómez de Castro

doi:10.1117/12.2633655

3 October 2022 Graphite to diamond phase transition induced by UV radiation

Ana I. Gómez de Castro

Proceedings Volume 12201, UV and Higher Energy Photonics: From Materials to Applications 2022; 1220103 (2022) https://doi.org/10.1117/12.2633655
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

Graphite and diamond are the two most common allotropes of solid carbon. Graphite is abundant in nature, diamond is much less abundant and has very much demanded characteristics such as its hardness and its properties as semiconductor: wide bandgap (5.45 eV) and high thermal conductivity (22W/cmK). Chemical vapor deposition (CVD) is often used by the industry to grow diamonds. However, nanodiamonds can also be produced by inducing the phase transition from the sp² layered structure of graphite to the sp³ cubic structure of diamond using UV radiation. The emission of photoelectrons results in a redistribution of the electrons from the graphite π bands to the interlayer band and a distortion of the graphitic lattice that drives at the sp² to sp³ transition. In this contribution, further details on the distribution and structure of the nanodiamonds produced by this means are provided.

Citation Download Citation

Ana I. Gómez de Castro "Graphite to diamond phase transition induced by UV radiation", Proc. SPIE 12201, UV and Higher Energy Photonics: From Materials to Applications 2022, 1220103 (3 October 2022); https://doi.org/10.1117/12.2633655

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