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Chemical vapor deposition growth of single-walled carbon nanotubes (SWCNTs) was studied using three representative carbon source sources: CO, ethanol, and methane, and a catalyst of Ni ions incorporated in MCM-41. The resulting SWCNTs were compared for similar reaction conditions. Carbon deposits were analyzed by multi-excitation wavelength Raman, TGA, TEM and AFM. Catalytic particles in the Ni-MCM-41...
Using TEM, absorption and photoluminescence-excitation spectroscopy we have shown that nitrogen and nitrogen/boron doping of single-walled carbon nanotubes produce significant changes in both the optical properties and the diameter distribution of nanotubes produced by the arc-discharge method. Smaller diameter tubes are preferentially formed in the presence of boron. In addition the presence of nitrogen...
Diphenylsiloxane oligomers (MN = 1200–4200, MW/MN < 1.3) without dimethylsiloxy end-group have been prepared and characterized. Cooling of the oligomer with a MN of 2200 or higher from the isotropic state results in the formation of the birefringent mesophase. A spherulite structure is observed upon further cooling from the mesophase. The increase of the mesophase temperature interval on the increasing...
Polypyrrole and poly(4-(3-Pyrrolyl)butane-sulfonate) films were electrodeposited potentiostatically or by potential cycling on Pt substrates. The growth behavior for electropolymerization of pyrrole and 4-(3-Pyrrolyl)butane-sulfonate was examined via an Electrochemical Quartz Crystal Microgravimetry (EQCM) in situ. The effects of pyrrole and 4-(3-Pyrrolyl)butane-sulfonate concentration on the deposition...
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