Analysis of Nickel Defect in Diamond with Photoluminescence upon Excitation near 200 nm

Lu, Hsiao‐Chi; Peng, Yu‐Chain; Lin, Meng‐Yeh; Chou, Sheng‐Lung; Lo, Jen‐Iu; Cheng, Bing‐Ming

doi:10.1021/acs.analchem.5b01493

Cited by 11 publications

(9 citation statements)

References 29 publications

(60 reference statements)

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“…The peak at 2327 cm –1 indicates the existence of the vibration mode of the B–H bond, which is well consistent with the previously reported result . Additionally, the Raman band at 1585 cm –1 is derived from the G peak of the carbon cloth …”

Section: Resultssupporting

confidence: 91%

“…15 Additionally, the Raman band at 1585 cm −1 is derived from the G peak of the carbon cloth. 43 To analyze the structural characteristics of the borophene nanosheets, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was adopted (Figure 3e). The absorption peaks of the borophene are 2471 and 2516 cm −1 , which are resulted from the stretching vibrations of B−H bonds in the hydrogenated borophene.…”

Section: Resultsmentioning

confidence: 99%

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Borophene Nanosheets as High-Efficiency Catalysts for the Hydrogen Evolution Reaction

Tai

Hou

et al. 2021

ACS Appl. Mater. Interfaces

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Borophene has been predicted to have outstanding catalytic activity owing to its extreme electron deficiency and abundant active sites. However, no experimental results have been still reported for borophene application in high-efficiency catalysis. Here, a borophene nanosheet was prepared on a carbon cloth surface via chemical vapor deposition. The boron source is sodium borohydride and the carrier gas is hydrogen gas. The crystal structure of the borophene nanosheet highly matches that of a theoretical α′-borophene nanosheet. Borophene shows good electrocatalytic hydrogen evolution reaction (HER) ability with a 69 mV/dec Tafel slope and good cycling stability in a 0.5 M H2SO4 solution. The enhanced performance is ascribed to an abundant electrocatalytic active area and low resistance of charge transfer, which results from its rich surface active sites. The improvement has been revealed by first-principles calculations, which is originated from their inherent metallicity and abundant electrocatalytic active sites on the nanosheets’ surface. Borophene’s extraordinarily high activity and stability give rise to extensive investigation of the application of borophene in high-efficiency energy applications such as catalysts and batteries.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Borophene Nanosheets as High-Efficiency Catalysts for the Hydrogen Evolution Reaction

Tai

Hou

et al. 2021

ACS Appl. Mater. Interfaces

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“…A few features are noteworthy. First, the PLE edge in the VUV region coincided with the absorption edge of pure diamond at 226 nm (inset in Figure ), − proving that the PL signals are directly associated with the interband absorption of the diamond. Second, the PLE signals began near 5.47 eV (226 nm) and rose substantially at about 7.0 eV (177 nm), a result of direct interband absorption.…”

Section: Resultsmentioning

confidence: 82%

Nitrogen-Vacancy Centers in Diamond for High-Performance Detection of Vacuum Ultraviolet, Extreme Ultraviolet, and X-rays

Peng

et al. 2019

ACS Appl. Mater. Interfaces

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Fluorescent nanodiamonds (FNDs) containing nitrogen-vacancy (NV) centers as built-in fluorophores exhibit a nearly constant emission profile over 550–750 nm upon excitation by vacuum-ultraviolet (VUV), extreme ultraviolet (EUV), and X-radiations from a synchrotron source over the energy (wavelength) range of 6.2–1450 eV (0.86–200 nm). The photoluminescence (PL) quantum yield of FNDs increases steadily with the increasing excitation energy, attaining a value as great as 1700% at 700 eV (1.77 nm). Notably, the yield curve is continuous, having no gap in the VUV to X-ray region. In addition, no significant PL intensity decreases were observed for hours. Applying the FND sensor to measure the absorption cross-sections of gaseous O2 over 110–200 nm and comparing the measurements with the sodium-salicylate scintillator, we obtained results in agreement with each other within 5%. The superb photostability and broad applicability of FNDs offer a promising solution for the long-standing problem of lacking a robust and reliable detector for VUV, EUV, and X-radiations.

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“…They are formed only upon irradiation of diamond particles containing substitutional N with high-energy electrons with subsequent annealing at high temperature [47,48]. However, the studied HP-HT nanodiamonds contain Ni-and N-centers [11,16,19,20,45,49,50]. From Figure 4, it can be seen that there are peaks in the luminescence spectrum at the wavelengths of 485 and 528-529 nm.…”

Section: Discussionmentioning

confidence: 96%

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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Analysis of Nickel Defect in Diamond with Photoluminescence upon Excitation near 200 nm

Cited by 11 publications

References 29 publications

Borophene Nanosheets as High-Efficiency Catalysts for the Hydrogen Evolution Reaction

Borophene Nanosheets as High-Efficiency Catalysts for the Hydrogen Evolution Reaction

Nitrogen-Vacancy Centers in Diamond for High-Performance Detection of Vacuum Ultraviolet, Extreme Ultraviolet, and X-rays

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

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