Carbide-Derived Nanoporous Carbon and Novel Core−Shell Nanowires

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Carbide-derived carbon (CDC) nanowires (NWs) have been synthesized by the high-temperature treatment of small-diameter β-SiC whiskers with Cl2/H2. A variety of physical measurements indicate that Si was extracted by exposure to Cl2 and that the C in the carbon nanowires is primarily sp2-bonded. From BET measurements, the specific surface area of these carbon nanowires is 1.3 × 103 m2/g and they contain a network of nanopores. Nanoindentation measurements indicate that the SiC-derived C is not a stiff material, the elastic modulus being 5.0 ± 1.2 GPa. High-temperature treatment of the CDC nanowires under an inert gas significantly increases the degree of graphitization. In addition, partial extraction was used to obtain core−shell structures having a thin and also very high surface area CDC shell; further treatment at high temperature was used to produce graphitized carbon shell−crystalline SiC core NWs.