聚吡咯
无机化学
聚丙烯腈
化学
铂金
铑
钯
水溶液
十二烷基苯
胶体
氯化物
材料科学
电化学
磺酸盐
催化作用
有机化学
钠
聚合物
物理化学
电极
作者
Matthew C. Henry,Chen‐Chan Hsueh,Brian P. Timko,Michael S. Freund
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2001-01-01
卷期号:148 (11): D155-D155
被引量:212
摘要
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 be 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. © 2001 The Electrochemical Society. All rights reserved.
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