Conducting polythiophene (PTh)/single-wall carbon nanotubes (SWNTs) composites were synthesized by the in situ chemical oxidative polymerization method. The resulting cablelike morphology of the composite (SWNT-PTh) structures was characterized with elemental analysis, X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared, ultraviolet-visible spectroscopy, field emission scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and transmission electron microscopy. The standard four-point-probe method was used to measure the conductivity of the samples. Field emission scanning electron microscopy and transmission electron microscopy analysis revealed that the SWNT-PTh composites were core (SWNTs) and shell (PTh) hybrid structures. Spectroscopic analysis data for the composites were almost identical to those for PTh, supporting the idea that SWNTs served as templates in the formation of a coaxial nanostructure for the composites. The physical properties of the composites were measured and also showed that the SWNTs were modified by conducting PTh with an enhancement of various properties. V V C 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5283-5290, 2006
In the present work, we studied thiram on silver surface by SERS. Investigations of disulfides with SERS revealed that the molecules undergo a surface reaction on silver, namely easy cleavage of the S-S bond. We believe that the two S atoms of resonance formed from the thiram may be chemisorbed strongly on Ag sol. This resonance form adheres perpendicularly to the Ag surface via the two S atoms, since the δ (CH 3 ) and ν (CN) mode perpendicular to the surface showed strong enhancement. The important roles of halide anion adsorption have been discussed and the pH effects of thiram on Ag sol in acidic, neutral, and alkaline conditions were examined.
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