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Study of Au–Pd core–shell nanoparticles by using slow positron beam
- Source :
- Applied Surface Science. 255:164-166
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- Binary Au–Pd nanoparticles were synthesized by ultrasonic irradiation of solutions containing Au3+ and Pd2+ ions (the ion ratio from 0.3:0.7 to 0.9:0.1 mM) and cationic surfactant (SDS: sodium dodecyl sulfate). In each case the core–shell structure (Au core, Pd shell) was confirmed by scanning transmission electron microscopy (STEM). The mean diameters of them were all about 9 nm, and the thickness of the Pd shell depends on the ratio of Pd2+ and Au3+ ions in solution. In order to study the electronic states of core–shell nanoparticles and their dependence on shell thickness, Doppler broadening measurements were performed for Au–Pd core–shell nanoparticles by using slow positron beam technique. The ratio curves of Au–Pd particles did not match with those of pure Pd and pure Au, but a small difference in the low electron momentum region was observed among nanoparticles depending on Pd shell thickness.
- Subjects :
- Nanostructure
Chemistry
Metal ions in aqueous solution
Analytical chemistry
Shell (structure)
General Physics and Astronomy
Nanoparticle
Surfaces and Interfaces
General Chemistry
Condensed Matter Physics
Surfaces, Coatings and Films
Ion
Transmission electron microscopy
Scanning transmission electron microscopy
Atomic physics
Doppler broadening
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 255
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........6cce5194609d3557feec6a71db29a268