A new method was found to synthesize large-area (7 × 15 mm2), high-density (higher than 109 cm−2), aligned carbon nanotubes (CNTs) with uniform diameters on a silica wafer. Ferrocene/melamine mixtures were pyrolyzed through a three-step process in an Ar atmosphere in a single-stage furnace. The structure and composition of the CNTs were investigated by scanning electron microscopy, transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), and electron energy-loss spectroscopy (EELS). It was found that these nanotubes have uniform outer diameters of about 22 nm and varying lengths from 10 to 40 μm. High-resolution TEM images showed that CNT is composed of graphite-like layers arranged in a stacked-cup-like structure. XPS results showed that the layer covering the tops of the aligned CNTs consists of carbon and iron. The EELS spectrum showed that these tubes are pure carbon.
1996 magnetic resonance, nuclear quadrupole resonance magnetic resonance, nuclear quadrupole resonance (organic substances) K 2560 26 -036 13C, 17O, and 29Si NMR Spectra and Stabilization of Silylated Ketenes and Bisketenes. -The stabilizing influence of silyl substituents on ketenes and bisketenes is discussed. The electronic distributions in these molecules are examined by means of NMR spectroscopy. -(ALLEN, A. D.; EGLE, I.; JANOSCHEK, R.; LIU, H. W.; MA, J.; MARRA, R. M.; TIDWELL, T. T.; Chem. Lett. (1996) 1, 45-46; Dep. Chem., Univ. Toronto, Toronto, Ont. M5S 1A1, Can.; EN)
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