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Progress on Diamane and Diamanoid Thin Film Pressureless Synthesis

Abstract : Nanometer-thick and crystalline sp3-bonded carbon sheets are promising new wide band-gap semiconducting materials for electronics, photonics, and medical devices. Diamane was prepared from the exposure of bi-layer graphene to hydrogen radicals produced by the hot-filament process at low pressure and temperature. A sharp sp3-bonded carbon stretching mode was observed in ultraviolet Raman spectra at around 1344–1367 cm−1 while no sp2-bonded carbon peak was simultaneously detected. By replacing bi-layer graphene with few-layer graphene, diamanoid/graphene hybrids were formed from the partial conversion of few-layer graphene, due to the prevalent Bernal stacking sequence. Raman spectroscopy, electron diffraction, and Density Functional Theory calculations show that partial conversion generates twisted bi-layer graphene located at the interface between the upper diamanoid domain and the non-converted graphenic domain underneath. Carbon-hydrogen bonding in the basal plane of hydrogenated few-layer graphene, where carbon is bonded to a single hydrogen over an area of 150 μm2, was directly evidenced by Fourier transform infrared microscopy and the actual full hydrogenation of diamane was supported by first-principle calculations. Those results open the door to large-scale production of diamane, diamanoids, and diamanoid/graphene hybrids.
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https://hal.archives-ouvertes.fr/hal-03431201
Contributor : Marc Monthioux Connect in order to contact the contributor
Submitted on : Tuesday, November 16, 2021 - 3:24:52 PM
Last modification on : Tuesday, January 4, 2022 - 6:45:31 AM

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Piazza-JCarbRes7(2021)9.pdf
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Distributed under a Creative Commons Attribution 4.0 International License

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Fabrice Piazza, Marc Monthioux, Pascal Puech, Iann Gerber, Kathleen Gough. Progress on Diamane and Diamanoid Thin Film Pressureless Synthesis. Journal of Carbon Research, MDPI, 2021, 7 (1), pp.9. ⟨10.3390/c7010009⟩. ⟨hal-03431201⟩

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