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Core‐shell SiC/SiO2 heterostructures in nanowires

This paper presents a simple vapour deposition method for one‐step synthesis of SiC//SiO2 core‐shell heterostructured nanowires. The phases, structures and morphologies of the synthesized core‐shell heterostructures are systemically studied by field emission scanning electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy, and high‐resolution transmission electron microscopy. The results show that these heterostructures consist of a single crystalline SiC core of 20∼30 nm diameter covered by a uniform layer, about 15 nm thickness of amorphous SiO2. Such heterostructures were grown based on the vapour–solid mechanism and the deposition way has an important influence on their morphology. A unique optical property has also been found in their photoluminescence spectra that have blue shift relative to the bulk SiC.