Carbide-Derived Nanoporous Carbon and Novel Core-Shell Nanowires

详细信息    查看全文

• 作者：Xinqi Chen ; Donald R. Cantrell ; Kevin Kohlhaas ; Sasha Stankovich ; James A. Ibers ; Mietek Jaroniec ; Hongsheng Gao ; Xiaodong Li ; and Rodney S. Ruoff
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：February 7, 2006
• 年：2006
• 卷：18
• 期：3
• 页码：753 - 758
• 全文大小：459K
• 年卷期：v.18,no.3(February 7, 2006)
• ISSN：1520-5002

文摘

Carbide-derived carbon (CDC) nanowires (NWs) have been synthesized by the high-temperaturetreatment of small-diameter mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-SiC whiskers with Cl₂/H₂. A variety of physical measurements indicatethat 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 theycontain a network of nanopores. Nanoindentation measurements indicate that the SiC-derived C is not astiff material, the elastic modulus being 5.0 ± 1.2 GPa. High-temperature treatment of the CDC nanowiresunder an inert gas significantly increases the degree of graphitization. In addition, partial extraction wasused to obtain core-shell structures having a thin and also very high surface area CDC shell; furthertreatment at high temperature was used to produce graphitized carbon shell-crystalline SiC core NWs.