Raman scattering in mosaic silicon carbide films

Aksyanov, I. G.; Kompan, M. E.; Kulkova, Irina

doi:10.1134/s1063783410090106

Cited by 25 publications

(12 citation statements)

References 5 publications

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“…In Figure 5 c, the Raman spectrum of bare SiC NWs revealed the TO and LO phonon modes at 797 cm −1 and 973 cm −1 , respectively, which are the characteristics of 3C-SiC. The LO peak is convoluted with the Raman response from the silicon substrate, as expected [ 36 , 51 , 59 ]. Extremely weak peaks around the positions of the D and G bands of graphene are observed for the bare 3C-SiC NWs, showing a negligible extent of unintended graphitization of the wires.…”

Section: Resultssupporting

confidence: 67%

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

et al. 2021

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The mid-infrared (MIR) is an exciting spectral range that also hosts useful molecular vibrational fingerprints. There is a growing interest in nanophotonics operating in this spectral range, and recent advances in plasmonic research are aimed at enhancing MIR infrared nanophotonics. In particular, the design of hybrid plasmonic metasurfaces has emerged as a promising route to realize novel MIR applications. Here we demonstrate a hybrid nanostructure combining graphene and silicon carbide to extend the spectral phonon response of silicon carbide and enable absorption and field enhancement of the MIR photon via the excitation and hybridization of surface plasmon polaritons and surface phonon polaritons. We combine experimental methods and finite element simulations to demonstrate enhanced absorption of MIR photons and the broadening of the spectral resonance of graphene-coated silicon carbide nanowires. We also indicate subwavelength confinement of the MIR photons within a thin oxide layer a few nanometers thick, sandwiched between the graphene and silicon carbide. This intermediate shell layer is characteristically obtained using our graphitization approach and acts as a coupling medium between the core and outer shell of the nanowires.

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Section: Resultssupporting

confidence: 67%

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

et al. 2021

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“…This situation can apparently be observed for relatively large particles synthesized at 1350 °C and above. After annealing, the fine structure described above transforms into an asymmetric line with a maximum at 971 cm −1 , which coincides with the frequencies of the LO (Г) phonons in undoped 3C SiC [38]. Thus, the tuning of the high-frequency LO peak component in Figure 3F corresponds to the transition from a mixed phonon-plasmon mode in the 3Cdoped SiC, to scattering by conventional LO (Г) phonons in the pure 3C SiC [39].…”

Section: Raman Spectra and Ir Transmissionmentioning

confidence: 61%

Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature High-Pressure Method

et al. 2021

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The development of new strategies for the mass synthesis of SiC nanocrystals with high structure perfection and narrow particle size distribution remains in demand for high-tech applications. In this work, the size-controllable synthesis of the SiC 3C polytype, free of sp2 carbon, with high structure quality nanocrystals, was realized for the first time by the pyrolysis of organosilane C12H36Si6 at 8 GPa and temperatures up to 2000 °C. It is shown that the average particle size can be monotonically changed from ~2 nm to ~500 nm by increasing the synthesis temperature from 800 °C to 1400 °C. At higher temperatures, further enlargement of the crystals is impeded, which is consistent with the recrystallization mechanism driven by a decrease in the surface energy of the particles. The optical properties investigated by IR transmission spectroscopy, Raman scattering, and low-temperature photoluminescence provided information about the concentration and distribution of carriers in nanoparticles, as well as the dominant type of internal point defects. It is shown that changing the growth modes in combination with heat treatment enables control over not only the average crystal size, but also the LO phonon—plasmon coupled modes in the crystals, which is of interest for applications related to IR photonics.

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“…The narrow band with a maximum at 519 cm −1 and two secondary bands at 300 and 940-1000 cm −1 with weak intensity, corresponded to the silicon vibrations, 28 were registered on the Si/graphite ( Figure 4a, specter 1) and Si/Ag (Figure 4a, specter 2) interfaces of samples, obtained at 973 K. Besides, there were the weak intensity bands in the range of 620 cm -1 and 1121 cm -1 , corresponding to the Si-O bonds vibration in the thin SiO x films. 29,30 In the high-frequency range of specter 1 the bands with maximum at 1350 cm -1 and 1600 cm -1 were recorded, which correspond to the sp 2 and sp 3 oscillations of the coupled carbon atoms, respectively.…”

Section: Resultsmentioning

confidence: 99%

Electrodeposition of Continuous Silicon Coatings from the KF-KCl-K₂SiF₆Melts

Zhuk

Исаков

Аписаров

et al. 2017

J. Electrochem. Soc.

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The silicon electrodeposition from the KF-KCl-(10 mol%) K2SiF6 melt at 943–1103 K has been studied. The polycrystalline continuous single-phase silicon coatings (∼99.9 wt% Si) have been obtained on the graphite, glassy carbon, silver, and tungsten substrates. The Raman spectroscopic study of the Si/C and Si/Ag interfaces has proved an absence of the intermediate phases. Two phases (Si and Ni2Si) were formed during the silicon electrodeposition on nickel.

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Raman scattering in mosaic silicon carbide films

Cited by 25 publications

References 5 publications

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature High-Pressure Method

Electrodeposition of Continuous Silicon Coatings from the KF-KCl-K₂SiF₆Melts

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Raman scattering in mosaic silicon carbide films

Cited by 25 publications

References 5 publications

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

Enhanced Absorption with Graphene-Coated Silicon Carbide Nanowires for Mid-Infrared Nanophotonics

Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature High-Pressure Method

Electrodeposition of Continuous Silicon Coatings from the KF-KCl-K2SiF6Melts

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Electrodeposition of Continuous Silicon Coatings from the KF-KCl-K₂SiF₆Melts