Laser-driven proliferation of sp2-sp3 changes during anti-Stokes white light emission of μ-diamonds

Olejniczak, Adam; Tomala, Robert; Cichy, Bartłomiej; Głuchowski, Paweł; Jakimów, Marcin; Zięba, Aneta; Kępiński, Leszek; Игнатенко, О. В.; Stręk, W.

doi:10.1016/j.carbon.2019.02.020

Cited by 19 publications

(15 citation statements)

References 44 publications

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“…This is due to the presence of reactive template MCA, where the polyaromatic condensation of carbonaceous is more favorable on the 2D-organized sheet-like structure of MCA. However, this result is contrary to the previous one because of the vulnerability of the bulk counterpart, as the in-situ decomposition of the carbon-based structure and further graphitization occurred during Raman spectroscopy even by the visible light (532 nm), increasing the intensity of the G-vibration peak [ 17 ].…”

Section: Resultsmentioning

confidence: 87%

Hierarchical Porous, N-Containing Carbon Supports for High Loading Sulfur Cathodes

et al. 2021

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The lithium-polysulfide (LiPS) dissolution from the cathode to the organic electrolyte is the main challenge for high-energy-density lithium-sulfur batteries (LSBs). Herein, we present a multi-functional porous carbon, melamine cyanurate (MCA)-glucose-derived carbon (MGC), with superior porosity, electrical conductivity, and polysulfide affinity as an efficient sulfur support to mitigate the shuttle effect. MGC is prepared via a reactive templating approach, wherein the organic MCA crystals are utilized as the pore-/micro-structure-directing agent and nitrogen source. The homogeneous coating of spherical MCA crystal particles with glucose followed by carbonization at 600 °C leads to the formation of hierarchical porous hollow carbon spheres with abundant pyridinic N-functional groups without losing their microstructural ordering. Moreover, MGC enables facile penetration and intensive anchoring of LiPS, especially under high loading sulfur conditions. Consequently, the MGC cathode exhibited a high areal capacity of 5.79 mAh cm−2 at 1 mA cm−2 and high loading sulfur of 6.0 mg cm−2 with a minor capacity decay rate of 0.18% per cycle for 100 cycles.

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Section: Resultsmentioning

confidence: 87%

Hierarchical Porous, N-Containing Carbon Supports for High Loading Sulfur Cathodes

et al. 2021

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“…There is a recent paper regarding laser-induced broadband light emission and structural changes in HP-HT micro-size diamonds after continuous excitation at near-infrared wavelengths, proposing a model of an sp 2 -sp 3 hybridization switch process assisting the multiphoton ionization and free to bound recombination of electron between two carbon atoms [53]. These results are in agreement with our hypothesis of laser-induced modification of the impurity complexes [Ni] and [Ni-N] containing nanodiamonds presented above.…”

Section: Discussionmentioning

confidence: 99%

Low-Power Laser Graphitization of High Pressure—High Temperature Nanodiamond Films

et al. 2020

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Laser-induced graphitization of 100 nm monocrystals of diamond particles synthesized by high-pressure high-temperature (HP-HT) methods is not typically observed. The current study demonstrates the graphitization of 150 nm HP-HT nanodiamond particles in ca. 20-μm-thick thin films formed on a glass substrate when the intensity of a focused 633 nm He-Ne laser exceeds a threshold of ~ 33 kW/cm2. Graphitization is accompanied by green luminescence. The structure and morphology of the samples were investigated before and after laser excitation while using X-ray diffraction (XRD), Raman spectroscopy, atomic force (AFM), and scanning electron microscopy (SEM). These observations are explained by photoionization of [Ni-N]- and [N]-centers, leading to the excitation of electrons to the conduction band of the HP-HT nanodiamond films and an increase of the local temperature of the sample, causing the transformation of sp3 HP-HT nanodiamonds to sp2-carbon.

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“…The diamond plates prepared in this way were annealed at SSPA SPMRC of NAS of Belarus in high-pressure apparatuses with toroid carbide matrices. This type of apparatus is commonly used for the synthesis of diamond and boron nitride micropowders [15]. A high pressure lithographic container with a diamond plate therein was installed in the carbide matrix.…”

Section: Sample Preparation and Annealingmentioning

confidence: 99%

“…At the same time, HPHT annealing can be performed at a lower cost in high-pressure devices designed for the synthesis of diamond powders [15]. The duration of the heat treatment in the powder synthesis apparatus is comparable to the heating time to a high temperature and is tens of seconds.…”

Section: Introductionmentioning

confidence: 99%

Rapid HPHT annealing of synthetic IB-TYPE diamonds

Kazuchits

Rusetskiy

et al. 2021

Carbon

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The paper provides the information on the effects of rapid (1 minute) high pressure high temperature (RHPHT) annealing of synthetic Ib-type diamond plates at temperatures (1900 °C, 2100 °C, 2300 °C, 2500 °C, 2700 °C) and pressure of 8 GPa. The studies were carried out using the visual analysis, absorption and Raman spectroscopy, photoluminescence and cathodoluminescence. During RHPHT annealing the diamond plates in a high-pressure container were rapidly heated/cooled at a very non-uniform temperature and pressure distribution. All this caused the inhomogeneous plastic deformation of diamond plates. The plastic deformation of diamonds during RHPHT annealing was a powerful "generator" of vacancies. The electron transfer from individual atoms of substituting nitrogen to nitrogen-vacancy centers switched these centers to a negatively charged state. Another accompanying RHPHT annealing process was the diffusion of nitrogen atoms with the formation of it's simple aggregates -H3 defects (at 2300°C). At higher RHPHT annealing temperatures more complex aggregates containing three nitrogen atoms -N3 defectswere generated. RHPHT annealing led to the formation of identical nitrogenvacancy defects, as did quasi stationary HPHT annealing, but the number of these defects was significantly greater after RHPHT annealing.

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Laser-driven proliferation of sp2-sp3 changes during anti-Stokes white light emission of μ-diamonds

Cited by 19 publications

References 44 publications

Hierarchical Porous, N-Containing Carbon Supports for High Loading Sulfur Cathodes

Hierarchical Porous, N-Containing Carbon Supports for High Loading Sulfur Cathodes

Low-Power Laser Graphitization of High Pressure—High Temperature Nanodiamond Films

Rapid HPHT annealing of synthetic IB-TYPE diamonds

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