Hydrocarbon and Carbon Nanostructures Produced by Sonochemical Reactions of Organic Solvents on Hydrogen-Passivated Silicon Nanowires under Ambient Conditions

详细信息    查看全文

• 作者：C. P. Li ; Boon K. Teo ; X. H. Sun ; N. B. Wong ; and S. T. Lee
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：November 15, 2005
• 年：2005
• 卷：17
• 期：23
• 页码：5780 - 5788
• 全文大小：1783K
• 年卷期：v.17,no.23(November 15, 2005)
• ISSN：1520-5002

文摘

A simple sonochemical solution method using silicon nanowires (SiNWs) as templates has beendeveloped to synthesize a wide variety of carbon nanostructures under ambient conditions (roomtemperature and atmosphere pressure). In addition to the conventional carbon nanotubes (CNTs) andnano-onions (CNOs), with interlayer spacings of 3.4 Å, a new class of hydrocarbon nanostructures,characterized as hydrocarbon nanotubes (HCNTs) and nano-onions (HCNOs), which exhibit variableinterlayer spacings greater than 3.4 Å, has been discovered. A wide variety of morphologies of thesehydrocarbon nanostructures were observed, including, but not limited to, tubes (both solid and hollowtubes); onions (both solid and hollow onions); tubular networks; open, closed, or connected loops orother networks; and twisted tubes or loops. Strong evidence for the templating effect of the SiNWs,including the molding and the demolding (extrusion) processes, were provided by direct transmissionelectron microscopic observations. The structure and bonding characteristics of this class of hydrocarbonnanomaterials were probed by single-nanowire electron-energy-loss spectroscopy and Raman spectroscopy.The distinctive properties of the hydrocarbon nanotubes and nano-onions, which are different from thoseof the conventional carbon nanotubes and nano-onions, are also discussed. Based on these experimentalobservations, mechanistic pathways for the formation of these nanostructures are proposed.