To verify that complete conversion of silica to silicon takes place in
the magnesiothermic reduction carried out by using the new
approach with vertically aligned mesoporous silica channels, analyses
of wide angle X-ray diffraction (XRD) pattern and X-ray photoelectron
spectroscopy (XPS) spectra were performed. For this
purpose, XRD of silicon nanostructures were prepared by magnesiothermic
reduction reactions of two different silica templates. First,
silicon nanoparticles were generated by employing a conventional
silica-GO composite as a control (black line). In this case, XRD
analysis (Figure 4a) shows that the silica layer not having a porous
structure is formed on the graphene oxide sheets by simply mixing of
TEOS and GO12. Second, silicon nanoparticles were prepared by
using the mesoporous silica structure (red line). Analysis of the
XRD patterns of the silicon particles produced by reduction of the
conventional silica composite show three prominent diffraction
peaks for silicon at 2h 5 28.4u, 47.3u and 56.1u (JCPDS #.65-1060),along with a broad peak around 2h ca. 23u corresponding to residual
silica. In contrast, the XRD pattern for silicon nanoparticle derived
from the mesoporous silica only contains diffraction peaks for silicon
only.
To verify that complete conversion of silica to silicon takes place inthe magnesiothermic reduction carried out by using the newapproach with vertically aligned mesoporous silica channels, analysesof wide angle X-ray diffraction (XRD) pattern and X-ray photoelectronspectroscopy (XPS) spectra were performed. For thispurpose, XRD of silicon nanostructures were prepared by magnesiothermicreduction reactions of two different silica templates. First,silicon nanoparticles were generated by employing a conventionalsilica-GO composite as a control (black line). In this case, XRDanalysis (Figure 4a) shows that the silica layer not having a porousstructure is formed on the graphene oxide sheets by simply mixing ofTEOS and GO12. Second, silicon nanoparticles were prepared byusing the mesoporous silica structure (red line). Analysis of theXRD patterns of the silicon particles produced by reduction of theconventional silica composite show three prominent diffractionpeaks for silicon at 2h 5 28.4u, 47.3u and 56.1u (JCPDS #.65-1060),along with a broad peak around 2h ca. 23u corresponding to residualsilica. In contrast, the XRD pattern for silicon nanoparticle derivedfrom the mesoporous silica only contains diffraction peaks for silicononly.
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