Effect of structure and composition of nanodiamond powders on thermal stability and oxidation kinetics

Bradac, Carlo; Osswald, Sebastian

doi:10.1016/j.carbon.2018.02.102

Cited by 32 publications

(17 citation statements)

References 61 publications

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“…Numerous studies have demonstrated that when nanocrystalline diamond grains are heated above 500 °C, they are severely etched. [38,39] Additionally, when the grain size is increased to a micron level, the etching rate decreases remarkably. [39] This is consistent with the findings obtained from this study.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Yang

et al. 2021

Advanced Optical Materials

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To date, researchers have confirmed the presence of more than 500 color centers. [8] Among them, the silicon-vacancy (SiV) color center exhibits an optical emission with a zero-photo line (ZPL) centered at 738 nm along with a narrow peak width at room temperature, which concentrates more than 70% of its signals. [9,10] This means that SiV centers have excellent performance in the areas of bio-labeling and nanothermometry. Generally, these applications demand high concentration or photoluminescence (PL) intensity. An efficient way of meeting this requirement is to dope sufficient Si atoms or SiV centers in diamonds, utilizing a silicon-containing gas precursor. [11,12] However, due to the large refractive index (about 2.4) of diamonds as well as the formation of sp 2 amorphous carbon or graphite phase, efficient PL extraction of color centers in polycrystalline diamond films remains a challenge. [13][14][15][16] Numerous approaches have been proposed to improve the PL emission of color centers. Of these, the etching of sp 2 carbon species to optimize crystalline quality has been confirmed to remarkably increase PL attributes in nanocrystalline diamonds. [15] Another approach to optimizing the PL emission of color centers in nanocrystalline diamond is to alter the surface termination from hydrogen to oxygen. [17][18][19][20][21] In comparison, these two methods have a negligible effect on increasing the PL of monocrystalline/polycrystalline diamonds. Other approaches, such as coupling color centers with photonic crystals [22][23][24] or micro/nano structures, [14,25] have been demonstrated to be viable for increasing the optical collection efficiency of microsized diamonds. For example, Ondic et al. [23] prepared 2D polycrystalline diamond photonic crystal slabs using a bottom-up approach, tuning the leaky modes to increase the PL intensity of SiV centers by 14 fold. However, the design of an accurate mask is highly critical in this approach to the subsequent etching and deposition processes, which is complicated and of high cost. Additionally, Insitu formed hetero-particles, [26] as well as diamond nanoparticles, [27,28] were also utilized as masks to fabricate 1D nanostructures during the reactive ion etching of diamond films. The realization of such a structure was dependent on the conductivity of the film. [27] Recently, it was reported that by annealing diamond particles in the air, a nanopyramid or irregular nanoporous structure was formed on their surface, resulting in aThe optically active silicon-vacancy (SiV) center in diamonds is an excellent candidate for quantum photonics and sensing applications. To date, optimizing the photoluminescence (PL) collection efficiency of SiV centers has proven difficult. To address this issue, the current study presents a simple two-step method for preparing single-crystalline diamond nanoneedle arrays. In the first step, silicon-doped (001) textured diamond films are deposited with a mixture of microcrystalline and nanocrystalline grains in a microwave plasma CVD (MPCVD)...

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Section: Resultsmentioning

confidence: 99%

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Yang

et al. 2021

Advanced Optical Materials

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“…A sharp peak observed at 1333 cm −1 is the symmetric stretching mode of the C-C bond of the diamond lattice structure (socalled diamond line) and a broad peak observed at around 1600 cm −1 is the G band of the surface graphitic layers (sp 2 -like) of ND particles . 24,28,[33][34][35][36] The intensity ratio of the diamond line and G band (I D /I G ) is shown in Fig. 2b remains (3a).…”

Section: Surface Characterizationmentioning

confidence: 83%

“…27 While acidic oxidation is enough to oxidize the surface of bulk diamonds in terms of T 2 extension, aerobic oxidation seems necessary for NDs to completely oxidize the surface and extend T 2 . 24,[28][29][30] The importance of aerobic oxidation is related to the surface inhomogeneity that NDs comprehend. For example, during the milling process of original bulk diamonds, the ND surface gets covered with a significant amount of carbon soot; such sp 2 -like materials turn the ND powder color from yellow to black.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface oxidation on electron spin coherence of single nitrogen-vacancy centers in nanodiamonds

Tsukahara,

Fujiwara,

Sera

et al. 2018

Preprint

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Fluorescent nanodiamonds (NDs) are crystaldefect-based light-emitting nanoparticles that can be applied to quantum information science and quantum sensing. Of particular interest are nitrogen vacancy (NV) centers that allow optical access to their coherently controllable electron spin systems, leading to spin-photon quantum devices and nanoscale sensing of various physical parameters. However, the NV spin coherence time (T 2 ) in NDs has been limited to one or two orders of magnitude shorter than those in bulk diamonds owing to the complicated surface effect that decoheres the NV spin systems. Here, we study the relation between the surface properties and T 2 of single NV centers in NDs by systematically analyzing the effect of surface oxidation. We apply aerobic and acidic oxidation methods with various heating temperatures and processing times and find that aerobic oxidation most effectively oxidizes the surface and extends T 2 by a factor of 1.6 to the original NDs. The ND-size dependence of T 2 clearly shows that the surface oxidation removes a constant decoherence contribution irrespective of the ND size and that a new surface-derived decoherence source emerges when the ND size reduces below 50 nm. The present results provide quantitative information on the decoherence sources of NV spin systems of NDs and will enable a strategic surface modification for better spin manipulations of NV centers in the context of quantum information science and nanoscale quantum sensing.

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“…However, nonisothermal oxidation studies related to the formation of SiO 2 and MoO 3 during MoSi 2 oxidation is scarce in the literature. Also, several research groups investigated the oxidation stability of a variety of materials through the TGA/DTG/DTA technique using an air atmosphere . So, it is crucial to study the nonisothermal oxidation behavior of MoSi 2 through the TGA/DTG/DTA technique.…”

Section: Resultsmentioning

confidence: 99%

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

2018

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Nanocrystalline molybdenum disilicide (MoSi2) is synthesized in a specially designed autoclave at 900°C. The XRD results revealed that the formation of MoSi2 is favorable with the blend of MoO3, Si, and Mg powders. The HR‐TEM and SAED patterns confirm the formation of MoSi2 phase. The structural parameters (crystallite size, strain, stress, and deformation energy density) are calculated using the Williamson‐Hall (W‐H) analysis. The formation mechanism involved in the synthesis of MoSi2 is proposed. The nonisothermal oxidation kinetics (~1200°C) of MoSi2 phase is examined through the thermal analysis techniques. The activation energy is determined by the Kissinger‐Akahira‐Sunsose isoconversional kinetic model. Finally, the reaction mechanism involved during the oxidation of MoSi2 phase is identified using the integral master‐plots method.

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Effect of structure and composition of nanodiamond powders on thermal stability and oxidation kinetics

Cited by 32 publications

References 61 publications

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Effect of surface oxidation on electron spin coherence of single nitrogen-vacancy centers in nanodiamonds

In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂

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Effect of structure and composition of nanodiamond powders on thermal stability and oxidation kinetics

Cited by 32 publications

References 61 publications

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Fabrication of Diamond Nanoneedle Arrays Containing High‐Brightness Silicon‐Vacancy Centers

Effect of surface oxidation on electron spin coherence of single nitrogen-vacancy centers in nanodiamonds

In situ single‐step reduction and silicidation of MoO3 to form MoSi2

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In situ single‐step reduction and silicidation of MoO₃ to form MoSi₂