Porous single-crystal diamond

Wang, Junpu; Su, Yuzhu; Tian, Yi; Xiang, Xiaojun; Zhang, Jiawei; Li, Shuaiqi; He, Duanwei

doi:10.1016/j.carbon.2021.06.083

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…Recent experiments demonstrated that even synthetic HPHT (high-pressure high-temperature) diamond single crystals can become a porous substrate through catalytic hydrogenation [26]. A new, interesting example of a porous diamond is HPHT diamond synthesis in metal melt, obtained by varying the growing medium [29]. Our recently obtained results as well demonstrated the growth of HPHT diamonds with numerous caverns which were formed by the presence of solid components in the metal melt [30], as predicted earlier [31].…”

Section: Introductionsupporting

confidence: 82%

Surface Porosity of Natural Diamond Crystals after the Catalytic Hydrogenation

et al. 2021

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The study of diamond surfaces is traditionally undertaken in geology and materials science. As a sample material, two natural diamond crystals of type Ia were selected, and their luminescence and nitrogen state was characterized. In order to etch the surface catalytic hydrogenation was performed using Fe particles as an etchant. Micromorphology of the surface was investigated by scanning electron and laser confocal microscopy. It was demonstrated that etching occurred perpendicular to the crystal surface, with no signs of tangential etching. The average depth of caverns did not exceed 20–25 μm with a maximal depth of 40 μm. It is concluded that catalytic hydrogenation of natural type Ia diamonds is effective to produce a porous surface that can be used in composites or as a substrate material. Additionally, the comparison of results with porous microsculptures observed on natural impact diamond crystals from the Popigai astrobleme revealed a strong resemblance.

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Section: Introductionsupporting

confidence: 82%

Surface Porosity of Natural Diamond Crystals after the Catalytic Hydrogenation

et al. 2021

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“…The graphite-diamond transformation experimental conditions are consistent with our conclusions in the discussion in section 3.6. T G (°C) = 127(±11) × P(GPa) + 450 (2) where T G is the Fe-Ni-graphite eutectic temperature, and T D is the Fe-Ni-diamond eutectic temperature. The fitting results reveal that the eutectic temperature and pressure are linearly related.…”

Section: Fe-ni-graphite Eutecticmentioning

confidence: 99%

“…The majority of synthetic diamonds are now manufactured using a high pressure and high temperature process, in which diamonds are grown in the presence of a metallic catalyst (group VIII metals, such as Fe, Ni, and Co, and also alloys of these metals, especially iron-based metals). [1][2][3] Various mechanisms have been proposed for diamond nucleation, including "solution growth theory", "a mechanism of the chemical reaction", and "solution-catalysis theory". [4][5][6][7][8] However, these proposed mechanisms were based on either the observation of high-pressure high-temperature (HPHT) quenched samples (so-called "cook and look") or simulation.…”

Section: Introductionmentioning

confidence: 99%

Graphite/diamond transformation mechanism under the action of an iron-based catalyst

Wang

Tian

et al. 2023

CrystEngComm

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“…In a recent work by Wang et al, millimetre-scale single-crystal diamond particles with porous diamond layers were obtained with a modied HPHT technique. 44 However, the HPHT diamonds are limited in size and cannot be prepared in the form of thin lms, so another technique for the synthesis of various diamond composites can be used insteadchemical vapor deposition (CVD). [45][46][47] CVD growth of diamond usually results in continuous polycrystalline or single-crystal lms with no gaps or pores.…”

Section: Introductionmentioning

confidence: 99%