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An easy method to synthesize SiO x coated carbon nanotubes (SiO x -CNT) through thermal decomposition of polycarbomethylsilane adsorbed on the surface of CNTs is reported. Physical properties of SiO x -CNT samples depending on various Si contents and synthesis conditions are examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen isotherm, scanning electron microscope (SEM), and transmission electron microscope (TEM). Morphology of the SiO x -CNT appears to be perfectly identical to that of the pristine CNT. It is confirmed that SiO x is formed in a thin layer of approximately 1 nm thickness over the surface of CNTs. The specific surface area is significantly increased by the coating, because thin layer of SiO x is highly porous. The surface properties such as porosity and thickness of SiO x layers are found to be controlled by SiO x contents and heat treatment conditions. The preparation method in this study is to provide useful nano-hybrid composite materials with multi-functional surface properties.

Preparation and Characteristics of SiOx Coated Carbon Nanotubes with High Surface Area