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Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure

1
Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, 108840 Moscow, Russia
2
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
3
Shubnikov Institute of Crystallography of Federal Scientific Research Centre, Crystallography and Photonics’, Russian Academy of Sciences, 119333 Moscow, Russia
4
Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague, Czech Republic
*
Authors to whom correspondence should be addressed.
Academic Editor: Christophe Donnet
Nanomaterials 2022, 12(3), 351; https://doi.org/10.3390/nano12030351
Received: 19 December 2021 / Revised: 15 January 2022 / Accepted: 17 January 2022 / Published: 22 January 2022
Diamond properties down to the quantum-size region are still poorly understood. High-pressure high-temperature (HPHT) synthesis from chloroadamantane molecules allows precise control of nanodiamond size. Thermal stability and optical properties of nanodiamonds with sizes spanning range from <1 to 8 nm are investigated. It is shown that the existing hypothesis about enhanced thermal stability of nanodiamonds smaller than 2 nm is incorrect. The most striking feature in IR absorption of these samples is the appearance of an enhanced transmission band near the diamond Raman mode (1332 cm1). Following the previously proposed explanation, we attribute this phenomenon to the Fano effect caused by resonance of the diamond Raman mode with continuum of conductive surface states. We assume that these surface states may be formed by reconstruction of broken bonds on the nanodiamond surfaces. This effect is also responsible for the observed asymmetry of Raman scattering peak. The mechanism of nanodiamond formation in HPHT synthesis is proposed, explaining peculiarities of their structure and properties. View Full-Text
Keywords: nanodiamond; Fourier-transformed infrared spectra; Raman scattering; high-pressure high-temperature synthesis; Fano effect; chloroadamantane nanodiamond; Fourier-transformed infrared spectra; Raman scattering; high-pressure high-temperature synthesis; Fano effect; chloroadamantane
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MDPI and ACS Style

Ekimov, E.; Shiryaev, A.A.; Grigoriev, Y.; Averin, A.; Shagieva, E.; Stehlik, S.; Kondrin, M. Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure. Nanomaterials 2022, 12, 351. https://doi.org/10.3390/nano12030351

AMA Style

Ekimov E, Shiryaev AA, Grigoriev Y, Averin A, Shagieva E, Stehlik S, Kondrin M. Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure. Nanomaterials. 2022; 12(3):351. https://doi.org/10.3390/nano12030351

Chicago/Turabian Style

Ekimov, Evgeny, Andrey A. Shiryaev, Yuriy Grigoriev, Alexey Averin, Ekaterina Shagieva, Stepan Stehlik, and Mikhail Kondrin. 2022. "Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure" Nanomaterials 12, no. 3: 351. https://doi.org/10.3390/nano12030351

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