The increase in the line-width and the shift of the peak position to lower frequencies with decrease in their size are explained theoretically from quantum confinement effects of phonons. Optical transmission s
The crystallinities of the as-synthesized and annealed AlOx–Fe2O3 nanoparticles were studied using X-ray diffraction (XRD; X'pert multipurpose diffractometer, PANalytical, Almelo, Netherlands) with a Cu Kα (λ = 1.54056 Å) source operated at 40 mA and 45 kV. XPS characterization was ...
The as-prepared sample was annealed at 773 K and 1173 K and characterized by XRD, TEM, UV–Vis spectra, and PL. The average nanocrystallite size was found of the order of ~27 nm using well-known Debye–Scherer's equation. From the UV–Vis spectra, it was shown that the position of...
pressure,sostretchingvibrationpeakpositionofSi-O-Simodemovestowardsthelong wavenumber. Keywords:condensedstatephysics;magnetronsputtering;O 2 partialpressure;amorphousSiO 2 film;FTIR 35 0引言 SiO 2 薄膜具有硬度高、耐磨性好、折射率低、消光系数低、色散小等特点,是一种重要 ...
It is hard the XRD peak broadening due low-intensity peak at to the small crystallite sizes. After ongoing thermal treatment 2θ = 25.6° also appears, which is the (101)-peak (100% peak) at of tt h=e 1β8- qhu, baretszidLeAs SZrpOha2,sae ScIentIFIc RePOrTs | 7: ...
The com- position of products in the reaction mixture at different time intervals was calculated using 1H NMR spectroscopy by comparing the peak intensities of the compounds with the peak intensity of mesitylene (internal standard). Received: 24 July 2020; Accepted: 28 February 2021 References 1....
XRD patterns at 4.7 and 7.6 GPa show a super-positioning of a very broad peak centred at 2θ=30.4° (±0.3) and the emergence of a narrow peak fitting the (110) position of stishovite at later time delays. We interpret this as observing first the compression of the amorphous silica...
(2022) observed an optical absorption band peak at 1.8 keV for biogenic SiO2 NPs synthesized using Rhus coriaria L. leaf extract. This difference might be attributed to the unique properties of the grapevine extract used in our study or variations in the synthesis pro- cess. The XRD ...
This observation is consistent with the XRD result. In the FTIR spectrum of WD-CNT@SiO2, the prominent peak near 1100 cm−1 corresponds to the stretching vibration of Si–O bonds in SiO2; whereas, the peaks observed at 2800∼3000 cm−1 correspond to stretching vibrations of C–H ...
The crystalline structure size was calculated using Scherrer's equation:2where D is crystallite size in nm, k is 0.95 (a constant), λ is wavelength of X-ray (0.1789 nm), β is full width at half maximum (FWHM in radians) and θ is peak position/2 (in radians). The percentage of ...