Catalytic activity of polypyrrole nanotubes decorated with noble-metal nanoparticles and their conversion to carbonized analogues

0456092 - ÚMCH 2017 RIV CH eng J - Journal Article
Sapurina, Irina - Stejskal, Jaroslav - Šeděnková, Ivana - Trchová, Miroslava - Kovářová, Jana - Hromádková, Jiřina - Kopecká, J. - Cieslar, M. - Abu El-Nasr, A. - Ayad, M. M.
Catalytic activity of polypyrrole nanotubes decorated with noble-metal nanoparticles and their conversion to carbonized analogues.
Synthetic Metals. Roč. 214, April (2016), s. 14-22. ISSN 0379-6779. E-ISSN 0379-6779
R&D Projects: GA ČR(CZ) GA13-00270S; GA MŠMT(CZ) LH14199; GA MŠMT(CZ) LO1507
Institutional support: RVO:61389013
Keywords : conducting polymer * polypyrrole nanotubes * noble metals
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 2.435, year: 2016

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.
Permanent Link: http://hdl.handle.net/11104/0256679