کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1440228 | 1509363 | 2016 | 9 صفحه PDF | دانلود رایگان |
• Polypyrrole nanotubes can be decorated with noble-metal nanoparticles.
• Platinum, palladium, ruthenium and rhodium nanoparticles have been tested.
• Hybrid composites calatyse the reduction of 4-nitrophenol to 4-aminophenol.
• Polypyrrole nanotubes are converted to analogous nitrogen-rich carbons.
• Platinum nanoparticles do not agglomerate during carbonization below 500 °C.
Polypyrrole nanotubes were prepared by the oxidation of pyrrole with iron(III) chloride in the presence of methyl orange. They were subsequently used as a substrate for the reductive deposition of noble metal particles. Polypyrrole nanotubes decorated with palladium, platinum, rhodium, or ruthenium nanoparticles were characterized by electron microscopy, conductivity, energy dispersive X-ray analysis, and FTIR and Raman spectroscopies. A typical metal content varied between 15 and 20 wt.%. The catalytic activity of composites was illustrated on the reduction of 4-nitrophenol to 4-aminophenol. The carbonization of composites has been followed by thermogravimetric analysis in nitrogen atmosphere. The nanotubular morphology of polypyrrole was retained after carbonization up to 830 °C. The noble-metal nanoparticles, nanometres in size, fused to clusters during this process, except for ruthenium. Polypyrrole nanotubes were converted to a nitrogen-containing carbon and platinum nanoparticles still preserved during carbonization at 400–500 °C.
Figure optionsDownload as PowerPoint slide
Journal: Synthetic Metals - Volume 214, April 2016, Pages 14–22