Behavior of detonation nanodiamond at high pressures and temperatures in the presence of a hydrogen-containing fluid

Varfolomeeva, T. D.; Lyapin, A. G.; Попова, С. В.; Borovikov, N. F.; Зибров, И. П.; Бражкин, В. В.

doi:10.1134/s0020168516040142

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…Under HPHT sintering conditions, the added C–H–O organics behave as a supercritical fluid that induces fast diamond recrystallisation. Rapid recrystallisation is accompanied by a higher density of vacancies [ 13 ]. This method, however, suppresses the pristine colour centres present in the precursor 5-nm DNDs [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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High-Quality Green-Emitting Nanodiamonds Fabricated by HPHT Sintering of Polycrystalline Shockwave Diamonds

et al. 2020

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We demonstrate a high-pressure, high-temperature sintering technique to form nitrogen-vacancy-nitrogen centres in nanodiamonds. Polycrystalline diamond nanoparticle precursors, with mean size of 25 nm, are produced by the shock wave from an explosion. These nanoparticles are sintered in the presence of ethanol, at a pressure of 7 GPa and temperature of 1300 °C, to produce substantially larger (3–4 times) diamond crystallites. The recorded spectral properties demonstrate the improved crystalline quality. The types of defects present are also observed to change; the characteristic spectral features of nitrogen-vacancy and silicon-vacancy centres present for the precursor material disappear. Two new characteristic features appear: (1) paramagnetic substitutional nitrogen (P1 centres with spin ½) with an electron paramagnetic resonance characteristic triplet hyperfine structure due to the I = 1 magnetic moment of the nitrogen nuclear spin and (2) the green spectral photoluminescence signature of the nitrogen-vacancy-nitrogen centres. This production method is a strong alternative to conventional high-energy particle beam irradiation. It can be used to easily produce purely green fluorescing nanodiamonds with advantageous properties for optical biolabelling applications.

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Section: Introductionmentioning

confidence: 99%

“…Rapid recrystallisation is accompanied by a higher density of vacancies [ 13 ]. This method, however, suppresses the pristine colour centres present in the precursor 5-nm DNDs [ 14 ]. Hence, an alternative approach that can preserve these defects or even create other types during the HPHT sintering process is desirable.…”

Section: Introductionmentioning

confidence: 99%

High-Quality Green-Emitting Nanodiamonds Fabricated by HPHT Sintering of Polycrystalline Shockwave Diamonds

et al. 2020

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“…Недавно в работах разных групп исследователей была продемонстрирована возможность образования монокристаллов алмаза субмикронных и микронных размеров из ДНА при высоких давлениях и температурах при использовании в качестве реакционной смеси порошка ДНА вместе с предельным ациклическим углеводородом, одноосновными или многоосновными спиртами [12,13], или нафталином [14]. Использование этой технологии дает возможность получать алмазные микрокристаллиты повышенной чистоты с малой зольностью (< 0.1 wt%), определяемой лишь химической чистотой исходного ДНА.…”

Section: Introductionunclassified

Эволюция Триплетных Парамагнитных Центров В Алмазах, Получаемых Спеканием Детонационных Наноалмазов При Высоком Давлении И Температуре

Осипов¹,

Shames

Ефимов³

et al. 2018

Физика Твердого Тела

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Исследованы спектры электронного парамагнитного резонанса (ЭПР) триплетных центров в наноалмазах детонационного синтеза и синтезируемых из них при высоких давлениях и температурах алмазных монокристаллах субмикронных размеров. В спектрах ЭПР детонационных наноалмазов наблюдаются сигналы от отрицательно заряженных азот-вакансионных центров (NV) − с g-фактором g 1 = 4.24 и мультивакансий с g 2 = 4.00. В спектрах алмазных микрокристаллов исчезают сигналы от (NV) − центров, и на месте сигнала от мультивакансий обнаруживается квинтетный сигнал с g = 4.00. Анализ формы и положения линии квинтета показал, что этот ЭПР сигнал обусловлен парами азотных центров замещения в алмазе, удаленных друг от друга на расстояния, не превышающие 0.7 нанометров, между которыми осуществляется сильное обменное взаимодействие. Сопоставление экспериментальных данных и результатов моделирования позволило определить параметры спин-гамильтониана обменно-связанных пар парамагнитных примесных атомов азота.

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“…• C leads to the formation of micro-sized diamond crystals [3], while the addition of naphthalene (C 10 H 8 ) to detonation nanodiamonds activates particle growth under similar thermobaric conditions [4]. In the C-H-F system, both micro-and nanodiamonds are formed under HPHT treatment.…”

Section: Introductionmentioning

confidence: 99%

Phase stability of fluorinated nanodiamonds under HPHT treatment

Khabashesku¹,

Филоненко²,

Anokhin³

et al. 2018

Nanosystems: Phys. Chem. Math.

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The aspects of phase and size stability of surface fluorinated nanoscale diamond powders during their treatment under conditions of high pressures and high temperatures (HPHT) are considered. In the studied powder, fluorine is covalently bonded to diamond particles, replacing the other functional groups on their surface. In this case, under pressure of 8.0 GPa the transition of 10-nm-size diamond nanoparticles into a graphene layered carbon forms does not occur up to temperatures of 1700• C, and their size does not change. The addition of submicro-sized aluminum powder to fluorinated nanodiamond results in the fast growth of particles to a micrometer size range. The observed unprecedented enlargement of nanodiamonds to micro-sized crystals is explained by occurrences of Wurtz-type reactions in the C-Al-F system which activate the formation of new interfacial carbon-carbon bonds between nanoparticles and their coalescence under HPHT conditions.

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Behavior of detonation nanodiamond at high pressures and temperatures in the presence of a hydrogen-containing fluid

Cited by 10 publications

References 9 publications

High-Quality Green-Emitting Nanodiamonds Fabricated by HPHT Sintering of Polycrystalline Shockwave Diamonds

High-Quality Green-Emitting Nanodiamonds Fabricated by HPHT Sintering of Polycrystalline Shockwave Diamonds

Эволюция Триплетных Парамагнитных Центров В Алмазах, Получаемых Спеканием Детонационных Наноалмазов При Высоком Давлении И Температуре

Phase stability of fluorinated nanodiamonds under HPHT treatment

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