Concentration-dependent properties of amorphous carbon nanotube/silica composites via the sol–gel technique†
Abstract
Amorphous carbon nanotube (α-CNT)/silica composites were synthesized by using the sol–gel technique. Fourier transform infrared spectroscopy (FT-IR) reveals the formation of an α-CNT/silica gel network through covalent bonding. Ultraviolet-visible (UV-Vis) spectroscopy shows a strong absorption band of the composites near the UV region. The amorphous structures of the composites are confirmed by X-ray diffraction (XRD) broad peaks. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) show a smooth surface at lower weight percentage (wt%) of α-CNTs but a rough surface at higher wt% of α-CNTs. The dielectric properties of the composites have slightly improved by incorporating α-CNTs in the silica.
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