High-pressure synthesis and optical properties of nanodiamonds obtained from halogenated adamantanes

Екимов, Е. А.; Kondrin, M. V.; Lyapin, S. G.; Grigoriev, Yu. V.; Razgulov, A.A.; Кривобок, В. С.; Gierlotka, S.; Stelmakh, S.

doi:10.1016/j.diamond.2020.107718

Cited by 33 publications

(23 citation statements)

References 38 publications

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“…We hypothesize that for nanodiamonds with diameter below 5 nm the surface hydrogenation is not dominant but the surface can be described as bare but reconstructed one. This assumption can explain the apparent dilatation of nanodiamonds observed in X-ray diffraction experiments [ 19 ]. This effect was explained by the strain exerted by the reconstructed surface on the ultra-small nanodiamonds [ 19 , 55 ].…”

Section: Discussionmentioning

confidence: 99%

“…This assumption can explain the apparent dilatation of nanodiamonds observed in X-ray diffraction experiments [ 19 ]. This effect was explained by the strain exerted by the reconstructed surface on the ultra-small nanodiamonds [ 19 , 55 ]. In fact, for (110) surface these sp

hybridized carbon chains occur naturally, for (111) surfaces they appear due to 2 × 1 reconstruction [ 55 , 56 ], and only for (100) surface there is no conductive layer.…”

Section: Discussionmentioning

confidence: 99%

“…Recent breakthroughs in nanodiamond synthesis in halogenated hydrocarbon systems at high static pressures (HPHT) enabled precise control of the ND size and made possible the growth of nanodiamonds with desired dimensions starting from values as small as 1 nm [ 17 , 18 , 19 , 20 , 21 ]. This provides an excellent opportunity for the refinement of thermal, structural, optical, and other properties of diamond on the ultra-small scale, which is important for the understanding and revealing of their prospects in future quantum and biomedical technologies.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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 cm−1). 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.

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Section: Discussionmentioning

confidence: 99%

hybridized carbon chains occur naturally, for (111) surfaces they appear due to 2 × 1 reconstruction [ 55 , 56 ], and only for (100) surface there is no conductive layer.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…More recently, NDs have been increasingly studied and developed in photocatalytic application field [18][19][20]. NDs can be synthesized by high-pressure high-temperature [21] (HPHT) technique [22][23][24], detonation method [1,24,25], laser ablation [26][27][28], plasma-assisted chemical vapor deposition (CVD) [29][30][31], and high energy ion irradiation of graphite or carbon onions [27,32]. NDs used in photocatalytic application are mainly prepared by detonation method.…”

Section: Introductionmentioning

confidence: 99%

Emerging applications of nanodiamonds in photocatalysis

Cao

Hao

et al. 2021

Functional Diamond

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as a fascinating nanocarbon photocatalytic material, nanodiamonds (NDs) have attracted more and more attention recently due to their high chemical stability, high carrier mobility, narrowing band gap, easy surface modification, and mass production. this review summarizes the latest progress related to elaborated construction of NDs and NDs-based nanocomposite, including microstructure regulation of pristine NDs, elemental doping and formation a heterojunction by coupled with another semiconductor. the construction and properties of each category of NDs-based material are reviewed on their structure, preparation methods, texture control, and photocatalytic performance. Photocatalytic applications of NDs-based nanomaterials for hydrogen evolution from water splitting, organic pollution degradation, cO 2 reduction, N 2 reduction, graphene oxide reduction, and the latest advances in photocatalytic reaction mechanism have been also systematically reviewed. Finally, the challenges and prospects of the photocatalytic application of NDs are also briefly analyzed.

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“…11 For example, a recently reported HPHT approach to directly synthesize NDs from molecular precursors uses halogenated adamantane species to further reduce the harsh reaction conditions during HPHT synthesis. 12 Additionally, EKIMOV et al…”

Section: Introductionmentioning

confidence: 99%