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The light-green cotton-like SiC nanowires have been prepared by pyrolysis of a polymer precursor with ferrocene as the catalyst by a chemical vapor deposition(CVD) route.Single SiC nanowires(NW) have been obtained by ethanol ultrasonic dispersion process and a single SiC NW-FET (nanowire field effect transistor) was fabricated by FIB (Focus-Ion-Beam) method on highly doped n-type silicon wafers with 300nm silicon oxide.