Computer study of the Raman spectra and infrared optical properties of gallium nitride and gallium arsenic nanoparticles with SiO2 core and shell

Галашев, А. Е.

doi:10.1007/s11051-014-2351-0

Cited by 3 publications

(2 citation statements)

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“…This phenomenon could be attributed to the increased SiO 2 detachment from the carbon framework, leading to the formation of numerous pores within the structure. In addition, some characteristic bands can be observed at 130, 460, 630, and 780 cm –1 , all corresponding to the characteristic bands of SiO 2 . The band at 130 cm –1 corresponds to torsional and O–Si–O bending vibrations, while the band near 460 cm –1 corresponds to the O–Si–O symmetrical stretching-bending modes.…”

Section: Resultsmentioning

confidence: 91%

“…In addition, some characteristic bands can be observed at 130, 460, 630, and 780 cm −1 , all corresponding to the characteristic bands of SiO 2 . 32 The band at 130 cm −1 corresponds to torsional and O−Si−O bending vibrations, while the band near 460 cm −1 corresponds to the O−Si−O symmetrical stretching-bending modes. In SiO 2 @SiO 2 /C and SiO 2 @Void@MC-12, there are distinct spectral bands related to SiO 2 , indicating that a large amount of SiO 2 exists in the samples.…”

Section: Resultsmentioning

confidence: 99%

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Carbon Nanospheres for Electromagnetic Wave Absorption and Shielding

Wu,

Liu,

Zhao

2024

ACS Appl. Nano Mater.

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Here, composites filled with carbon nanospheres of different morphologies exhibit the same electromagnetic wave (EMW) absorption and loss mechanisms when they possess the same carbon content. Conductive loss is their primary EMW absorbing mechanism, while the effect of polarization loss can be ignored entirely. Composites with a filling amount lower than the percolation threshold of the carbon nanospheres and certain conductivity possess excellent EMW absorbing behavior, while composites with a filling amount close to or higher than the percolation threshold reveal outstanding EM interference (EMI) shielding. The minimum reflection loss (RL min ) and maximum effective absorption bandwidth (EAB max ) of mesoporous carbon hollow nanospheres (MCHS) reach −50.52 dB and 5.90 GHz at an ultralow filling amount of 3 wt %. The EMI shielding effectiveness (SE) of the MCHS is as high as 118.23 dB at a fill level of 12 wt %, with an average SE of 84.50 dB. Among them, conductive loss has a more significant contribution to low-frequency EMW absorption. Frequency-selective EMW absorbing performance can be obtained by simply adjusting the material conductivity. Compared with the currently reported carbon nanomaterials, the carbon nanospheres in this study reveal significant advantages in EM-resisting performances and unique lowfilling characteristics.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%