The nanocomposites were characterized by Raman spectroscopy,
which was performed on a Renishaw Invia Raman microscope
with a laser wavelength of 514.5 nm and a spectral
resolution of 0.02 cm1. The degree of dispersion of the nanoparticles
and nanocomposite morphology was analyzed by transmission
electron microscopy by using a Philips Tecnai 20 microscope
at an accelerating voltage of 200 kV. Ultrathin sections of the samples
were prepared by crioultramicrotomy at 140 C using Leica
EM UC6 crioultramicrotome equipment.