Journal ArticleDOI
Reaction of Pyrrole and Chlorauric Acid A New Route to Composite Colloids
TLDR
In this article, the second-order rate constant for the reaction of chlorauric acid with pyrrole in dilute solution was found to he 13 M -1 s -1.Abstract:
Composite colloids of gold and polypyrrole were prepared using two different methods: 1, using pyrrole colloid, created by the oxidation of pyrrole by ferric chloride, to subsequently reduce chlorauric acid and, 2, oxidizing pyrrole monomer with chlorauric acid in a sodium dodecylbenzene sulfonate solution. In each case, the polypyrrole colloid consisted of irregularly shaped particles approximately 500 nm in diameter. The gold produced in each case was in the form of irregular spheres, approximately 407 nm in diameter in method 1 and 13 nm in method 2. X-ray photoelectron spectroscopy was used to determine the oxidation state of the species present. Transmission electron microscopy and light scattering data were used to determine the particle sizes of both gold and polypyrrole colloids. Energy dispersed spectrum X-ray analysis and electron diffraction were used to confirm the presence of metallic gold in the composite colloids. The second-order rate constant for the reaction of chlorauric acid with pyrrole in dilute solution was found to he 13 M -1 s -1 . Aqueous solutions of palladium, platinum, rhodium, cobalt, tin, silver, zinc, nickel, titanium, cadmium, mercury, arsenic, and selenium were also examined for their potential to act as oxidants to produce composite polypyrrole colloids. Palladium, platinum, and rhodium salts were suitable oxidants, producing polypyrrole in less than 12 h.read more
Citations
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Journal ArticleDOI
New pathway for sonoelectrochemical synthesis of gold-silver alloy nanoparticles from their bulk substrates
TL;DR: In this paper, the first sonoelectrochemical methods to synthesize gold-silver alloy nanoparticles with the mean diameter of 5 nm in 0.1 N HCl aqueous solutions without addition of any stabilizer were reported.
Journal ArticleDOI
Sonoelectrochemical synthesis of spike-like gold-silver alloy nanoparticles from bulk substrates and the application on surface-enhanced Raman scattering
TL;DR: The synthesis of non-spherical spike-like gold-silver alloy nanoparticles on platinum substrates was first developed by sonoelectrochemical methods in this study and the surface-enhanced Raman scattering (SERS) of Rhodamine 6G on the Au-Ag alloy nanoparticle-deposited Pt substrate exhibits a higher intensity by eight-fold of magnitude and a better resolution, as compared to that obtained on the au nanoparticles-deposed Pt substrate.
Journal ArticleDOI
Synthesis and characterization of Ag/PPy composite films via enhanced redox reaction of metal ions
TL;DR: A facile approach to the formation of Ag/PPy composite film, through the reaction of Ag + and pyrrole monomer, was developed with the help of synergistic effect of NH 3 ·H 2 O on this reaction as mentioned in this paper.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
Handbook of conducting polymers
TL;DR: In this paper, the authors presented the theory and properties of conjugated polymers, including transport, optical, and self-assembly properties of poly(3,4-Ethylenedioxythiophene)-polymers.
Journal ArticleDOI
Enhanced electrocatalysis of oxygen reduction on platinum alloys in proton exchange membrane fuel cells
TL;DR: In this paper, the electrocatalysis of the oxygen reduction reaction (ORR) on carbon-supported binary and ternary alloys of Pt in phosphoric acid fuel cells has been reported.
Journal ArticleDOI
Nanoscale colloidal metals and alloys stabilized by solvents and surfactants Preparation and use as catalyst precursors
Helmut Bönnemann,G. Braun,Werner Brijoux,Rainer Brinkmann,A. Schulze Tilling,Klaus Seevogel,K. Siepen +6 more
TL;DR: In this article, a comparison of catalytic results and CO chemisorption experiments has revealed that the protecting surfactants still cover the nanoparticle surface after adsorption on supports, which markedly improves the lifetime of the catalysts.