Single-crystal diamond microneedles shaped at growth stage

Zolotukhin, A. A.; Dolganov, Matvey A.; Алексеев, А. М.; Obraztsov, A. N.

doi:10.1016/j.diamond.2013.09.003

Cited by 36 publications

(19 citation statements)

References 16 publications

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“…Образцы были получены в результате последова-тельного проведения процессов ГФХО и селективного окисления [11][12][13]. С помощью ГФХО-методики полу-чались поликристаллические пленки с (001)-текстурой, состоящие из алмазных кристаллитов микрометрового размера в окружении сильнодефектного (в том чисде неалмазного) материала.…”

Section: экспериментальные методикиunclassified

“…Кристаллиты наибольшего размера простираются на всю толщину пленки и находятся в окружении кристаллов меньшего размера, имеющих аналогичную пирамидальную форму (подробнее см. [12]). …”

Section: экспериментальные методикиunclassified

“…Ранее в наших работах была предложена методика производства алмазных монокристаллов пирамидальной (иглоподобной) формы [11,12]. Разработанная техноло-гия позволяет контролируемо изменять геометрические параметры пирамидальных кристаллитов (длина, пло-щадь основания, угол раствора, размер у вершины) в определенном диапазоне.…”

Section: Introductionunclassified

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Люминесцентные Свойства Монокристаллов Алмаза Пирамидальной Формы

Алексеев¹,

Туякова²,

Образцова³

et al. 2016

Физика Твердого Тела

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Проведено исследование люминесцентных свойств иглоподобных кристаллов алмаза, полученных путем селективного окисления текстурированных поликристаллических алмазных пленок. Алмазные пленки выращены методом химического газофазного осаждения из метан-водородной смеси, активированной разрядом постоянного тока. Для отдельных иглоподобных кристаллов получены спектры фото- и катодолюминесценции, а также пространственное распределение интенсивности излучения на различных длинах волн. На основании полученных спектральных характеристик сделаны выводы о наличии в их структуре оптически активных дефектов, содержащих примеси азота и кремния, а также о существенном влиянии структурных дефектов на спектры люминесценции. Работа выполнена при финансовой поддержке Российского научного фонда (проект N 14-12-00511) и Программы поддержки молодых ученых Президента РФ (грант МК-6201.2014.2).

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Section: экспериментальные методикиunclassified

Section: Introductionunclassified

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Люминесцентные Свойства Монокристаллов Алмаза Пирамидальной Формы

Алексеев¹,

Туякова²,

Образцова³

et al. 2016

Физика Твердого Тела

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“…Single crystal diamond needle (SCDN) is one of the very promising for various applications type of diamond materials. SCDN has a pyramidal shape with square base, few nm size of the apex, solid angle from 5 to 10°, and length from 1 to 200 μm . Monocrystalline nature, unique shape, and optical properties of SCDNs make them a budding candidates for optical probes and sensors.…”

Section: Introductionmentioning

confidence: 99%

“…SCDN has a pyramidal shape with square base, few nm size of the apex, solid angle from 5 to 10 , and length from 1 to 200 μm. [14] Monocrystalline nature, [15] unique shape, [16] and optical properties [17] of SCDNs make them a budding candidates for optical probes and sensors. The monocrystalline structure of needles as a whole (including those for the areas at apex and at base of the pyramids) has been exhibited in our previous investigations with use of high resolution transmission electron microscopy (see refs.…”

Section: Introductionmentioning

confidence: 99%

Formation of GeV, SiV, and NV Color Centers in Single Crystal Diamond Needles Grown by Chemical Vapor Deposition

Malykhin

Mindarava

Исмагилов³

et al. 2019

Physica Status Solidi (b)

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Herein the color centers formation in diamond crystallites of pyramidal shape grown by chemical vapor deposition (CVD) is described. The individual crystallites are extracted from polycrystalline films grown on silicon substrates. The silicon‐vacancy (SiV), germanium‐vacancy (GeV), and nitrogen‐vacancy (NV) centers are created by introducing corresponding precursors from substrate material, gaseous nitrogen, and thermally evaporated germanium added during CVD. Some amount of NV centers detected in all types of the diamond crystallites is assigned to uncontrollable presence of nitrogen in the CVD reactor. The low temperature photoluminescence spectra indicate presence of ensembles of SiV centers in diamond structure. The SiV centers are concentrated predominantly at apexes of the diamond crystallites located at substrate surface. Intense growth of CN radicals in plasma‐activated gas environment during CVD process is detected after nitrogen gas addition. The crystallites obtained with the nitrogen addition demonstrate significant variation of their pyramid angle. The photoluminescence spectra of crystallites grown with nitrogen addition demonstrate increase of both negatively and neutrally charged states of NV color center. The GeV centers are created via thermal evaporation of pure Ge during CVD growth. The photoluminescence spectra of the crystallites grown with Ge addition demonstrate presence of GeV color centers ensemble.

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All‐Optical Thermometry with NV and SiV Color Centers in Biocompatible Diamond Microneedles

Golubewa

Padrez

Malykhin

et al. 2022

Advanced Optical Materials

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Monitoring of tiny intracell temperature variations is of high importance to understand the mechanisms of exothermic/endothermic processes inside the living cells. Small shifts in thermal balance may drastically influence cell functioning and induce pathological conditions. By using biocompatible diamond single‐crystal microneedles enriched with nitrogen‐vacancy (NV)/silicon‐vacancy (SiV) color centers, this study demonstrates all‐optical in vitro temperature monitoring in the physiologically significant range (25–55 °C). Zero‐phonon line (ZPL) of SiV centers belonging to the “therapeutic window” is used to improve measurement precision via suppression of the tissue autofluorescence. The simultaneous detection of the NV and SiV fluorescence enables two‐band visualization of the living cells combined with the temperature sensing. This study demonstrates experimentally that temperature can be measured by lifetime, full‐width at half maximum, and peak position of SiV ZPL, while accuracy can be further improved by normalizing the photoluminescence (PL) ZPL peak intensity on the PL signal measured at the wavelength where it is temperature independent. According to performed numerical simulations diamond microneedles enable real‐time temperature measurements because their characteristic heating time is less than 10 ns. The results open a way toward accurate, noninvasive, precise, and real‐time monitoring of temperature variations accompanying intracellular biochemical reactions and processes on the single‐cell level.

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Single-crystal diamond microneedles shaped at growth stage

Cited by 36 publications

References 16 publications

Люминесцентные Свойства Монокристаллов Алмаза Пирамидальной Формы

Люминесцентные Свойства Монокристаллов Алмаза Пирамидальной Формы

Formation of GeV, SiV, and NV Color Centers in Single Crystal Diamond Needles Grown by Chemical Vapor Deposition

All‐Optical Thermometry with NV and SiV Color Centers in Biocompatible Diamond Microneedles

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