Synthesis of palladium nanoparticles in a ceramic matrix using radiation grafting method

Silicon carbide (SiC) ceramics containing palladium (Pd) nanoparticles were synthesized by the combination of the radiation grafting method, which allowed for uniform dispersion of Pd ions in polycarbosilane (PCS), and subsequent heat treatment, which was used to promote the bleedout phenomenon. The...

Full description

Saved in:
Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2011-04, Vol.80 (4), p.587-590
Main Authors: Yoshimura, Kimio, Hakoda, Teruyuki, Sugimoto, Masaki, Yamamoto, Shunya, Yoshikawa, Masahito
Format: Article
Language:English
Subjects:
Bleeding
Catalyst
Catalytic activity
Ceramics
Grafting
Heat treatment
Nanoparticles
Palladium
Polycarbosilane
Radiation grafting
Silicon carbide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Silicon carbide (SiC) ceramics containing palladium (Pd) nanoparticles were synthesized by the combination of the radiation grafting method, which allowed for uniform dispersion of Pd ions in polycarbosilane (PCS), and subsequent heat treatment, which was used to promote the bleedout phenomenon. The size and distribution of the Pd nanoparticles varied with the heat-treatment temperature. TEM and XRD analyses indicated that Pd nanoparticles of 2–5nm in size were homogeneously distributed in the SiC ceramic matrix at temperatures lower than 1173K. At a temperature of 1373K, the size of these particles was found to increase and a portion of Pd was changed into Pd silicide. The Pd nanoparticles in samples heated at temperatures lower than 1173K showed catalytic activity for hydrocarbon oxidation, whereas samples treated at 1373K did not show any catalytic activity. These results suggest that Pd nanoparticles were formed on the SiC matrix at temperatures lower than 1173K. The bleedout process enables the production of Pd nanoparticles as a combustion catalyst from radiation-grafted Pd-PCS.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2010.12.008