Isotope composition dependence of the band-gap energy in diamond

Watanabe, Hideyuki; Koretsune, Takashi; Nakashima, S.; Saito, Susumu; Shikata, Shinichi

doi:10.1103/physrevb.88.205420

Cited by 20 publications

(27 citation statements)

References 30 publications

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“…It originates from one in-plane transverse optical (iTO) phonon around the K or K points in the first Brillouin zone and involves an intervalley double-resonance (DR) process. The G band appears around 1580 cm −1 for the pure 12 C sample and corresponds to the E 2g phonon mode at the Brillouin zone center. The G * and 2D bands for pure 12 C are around 2450 and 2675 cm −1 , respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The G band appears around 1580 cm −1 for the pure 12 C sample and corresponds to the E 2g phonon mode at the Brillouin zone center. The G * and 2D bands for pure 12 C are around 2450 and 2675 cm −1 , respectively. Both are second-order modes and originate from intervalley DR processes.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 1 shows the Raman spectra of a single-layer graphene with five different 13 C concentrations (0.01%, 25%, 50%, 75%, and 100%), obtained with a 2.18 eV laser excitation energy and displaying the main Raman features (the D, G, G * , and 2D bands). The D mode appears around 1350 cm −1 for the pure 12 C sample and consists in a breathing mode of six-atom rings, activated via a defect in the lattice. It originates from one in-plane transverse optical (iTO) phonon around the K or K points in the first Brillouin zone and involves an intervalley double-resonance (DR) process.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of SWCNTs, a redshift of the G band when the 13 C concentration is increased * brunorc@fisica.ufmg.br † fantini@fisica.ufmg.br has been reported [10], and a dependence of the G band linewidth on the isotope concentration was observed [14]. Studies of bilayer graphene, where one layer is composed of 12 C atoms and the other of 13 C atoms, were performed, thus allowing the investigation of interlayer interactions in the Raman scattering process [11,15]. It was also observed in twisted bilayer graphene that the G band intensity is enhanced in regions of the sample where the separation in energy of the van Hove singularities in the density of states, which are induced by the twisted electronic band structure, match the laser excitation energy [15].…”

Section: Introductionmentioning

confidence: 99%

“…Significant efforts have been devoted to produce and study isotope-enriched graphene-related materials [4][5][6][7][8][9][10][11][12][13]. For instance, isotope labeling provided direct evidence that the growth mechanism of graphene is substrate dependent and, furthermore, shed light on the rational design of chemical vapor deposition (CVD) synthesis methods [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Probing carbon isotope effects on the Raman spectra of graphene with differentC13concentrations

et al. 2015

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A resonance Raman study of graphene samples with different 13 C isotopic concentrations and using different laser excitation energies is presented. The main Raman peaks (D, G, G * , and 2D) of graphene were measured and the dependence of their frequencies on the isotope atomic mass follows a simple harmonic oscillator relation. The G * and 2D double-resonance peak positions were measured as a function of the laser energy, and we observed that the slopes of the laser energy dependence are the same independently of isotope concentration. This result shows that isotopic substitution does not alter the electron and phonon dispersions near the K point of the graphene Brillouin zone. From the linewidth of G and 2D Raman peaks, we have also obtained a dependence of the phonon lifetime on the 13 C isotope concentration.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probing carbon isotope effects on the Raman spectra of graphene with differentC13concentrations

et al. 2015

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Fabrication of Isotope‐Enriched Nanostructures Using Ultrafast Laser Pulses under Ambient Conditions for Biomolecular Sensing

Premachandran,

Manickam,

Tan

et al. 2024

Advanced Materials

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Recent advances in the use of stable isotopes necessitate novel synthesis techniques for isotope separation and enrichment that are scalable and offer high throughput. Stable‐isotope‐enriched nanostructures can offer unique advantages as nanomedicines, safe tracers, and labels and are critical for applications in various industrial processes, metabolic research, and medicine. So far, there exists no method to synthesize miniature isotope‐enriched materials at the nanoscale. In this study, an ultrafast Laser‐induced isotope enrichment at nanoscale (LIIEN) is put forward to synthesize isotope‐enriched nanostructures, eliminating the need for large equipment and expenses, thereby demonstrating a lab‐scale isotope enrichment process. A significant isotope enrichment for Carbon nanostructures is observed. The isotope enrichment can be attributed to the redistribution of isotope ions in the plasma plume explained by the plasma centrifuge model. The LIIEN synthesized structures exhibit excellent Surface‐Enhanced Raman Scattering (SERS) signal enhancement and reproducibility, making them potential candidates for SERS‐based biomolecule sensing. This technique is an efficient method to fabricate nanosized isotope‐enriched structures of characteristic properties by carefully tuning laser parameters at ambient conditions.

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Isotopic Labelling of Confined Carbyne

et al. 2021

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Carbyne is a one-dimensional allotrope of carbon consisting of a linear chain of carbon atoms bonded to each other with exceptional strength. Its outstanding mechanical, optical, and electronic properties have been theoretically predicted, but its stability has only been achieved when grown encapsulated in the hollow core of carbon nanotubes. One of the advantages of this confinement is that its properties can be controlled by the chains length and surrounding environment. We investigated an alternative way of gaining control of its properties is using isotope labelling as tuning mechanism. The optimized liquid precursor was first chosen among several options, which can greatly enhance the yield of the confined carbyne. Then isotopic labelled liquid precursor was encapsulated for further synthesis of isotopic labelled confined carbyne. This allowed us to obtain pioneering results on isotope engineered carbyne with around 11.9 % of 13 Clabelling using 13 C-methanol as precursor.Linear carbon chains (LCCs) are one-dimensional (1D) arrangements with excellent predicted mechanical, optical, and electronic properties. [1][2][3][4][5][6][7][8][9] They represent the forerunner for the true 1D carbon allotrope carbyne, an infinite or very long linear carbon chain with anticipated strength, elastic modulus, and stiffness greater than those of any known material. [10][11][12] Recently, confined carbyne (CC) was reported as the strongest known Raman scatterer with a resonant differential Raman cross section per atom in the order of 10 À22 cm 2 sr À1 , which is three orders of magnitude larger than that of any other existing material. Compared to graphene,

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Isotope composition dependence of the band-gap energy in diamond

Cited by 20 publications

References 30 publications

Probing carbon isotope effects on the Raman spectra of graphene with differentC13concentrations

Probing carbon isotope effects on the Raman spectra of graphene with differentC13concentrations

Fabrication of Isotope‐Enriched Nanostructures Using Ultrafast Laser Pulses under Ambient Conditions for Biomolecular Sensing

Isotopic Labelling of Confined Carbyne

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