| Autor: |
Gomaa, Hosam M., Saudi, H. A., Yahia, I. S., Zahran, H. Y., Makram, B. M. A. |
| Předmět: |
|
| Zdroj: |
Journal of Electronic Materials; Aug2023, Vol. 52 Issue 8, p5586-5593, 8p |
| Abstrakt: |
In this study, graphene nanopowder was used as an impurity material in lead borovanadate glass that contained fixed amounts of Ca2+ and Na+ cations. The rapid quenching method was adopted to prepare five samples that differ in their graphene content. X-ray diffraction patterns proved the amorphous nature of all prepared samples, where the patterns showed two broad humps for the graphene-free sample and three broad humps for each graphene-doped sample. Fourier transform infrared (FTIR) spectra showed that the glass networks of the prepared samples are composed of multi-structural units (BO3, BO4, VO4, and PbO4). FTIR spectral analysis showed an increase in the concentration of VO2 isolated group as the graphene content was increased, which was corroborated by the evident increase in the electron spin resonance absorption spectra. UV–Vis spectra revealed an increase in the value of the optical absorbance (A) as graphene content increased, with five different absorption overlapped detectable peaks. The deconvolution of the A-λ curve showed five overlapped peaks located at 210, 270, 310, and 485 nm in the case of the graphene-free sample. But in the case of graphene-doped samples, the peak center at 485 nm moved to 460 nm. The hydrogenic exciton model was used to simulate the absorption coefficient spectra of the studied samples. The extracted values of the absorption strength parameter Co reveals the capacity of the studied samples to absorb electromagnetic energy, and it also shows that absorption at λ = 310 nm is dominant for all samples. On the other hand, the average value of Co increased with the increase in graphene nanopowder content, which was assigned to an increase in the glass surface area. The consistency in the values of both the exciton binding energy R and continuum line width гc is an indication that the graphene nanoparticles settled into interstitial vacancies. All of these findings suggest that the investigated samples can be used as active components in electronic devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink