Abstract
Core-and-shell nanoparticles of Ru-Ni in the size range of 5-10 nm were synthesized by a single-step spray-pyrolysis process. Ruthenium chloride (RC) and nickel chloride (NC) were dissolved in water and used as a feed stream through an ultrasonic atomizer. The ruthenium chloride to nickel chloride (RC/NC) ratio was varied from 1:1 to 5:1 at various operating temperatures ranging from 500 °C to 1000 °C. Smooth core-and-shell nanoparticles were formed when the RC/NC ratio was 3:1 and 5:1 at 800 °C and 600 °C. A mechanism leading to the formation of such morphologies was proposed and was compared with the experimental results. It was found that as the RC/NC ratio in the precursor increased, temperature can be decreased to obtain core-and-shell nanoparticles. RC/NC ratio of 1:1 at low temperatures of 500 °C generated core-and-shell nanoparticles which are concentric rings. No core-and-shell morphologies were observed at temperatures higher than 800 °C. Once the core-and-shell particles are formed, the temperature can be varied in the range of 200 °C to cause a geometry change from core-and-shell to spherical nanoparticles.
Original language | English (US) |
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Pages (from-to) | 282-289 |
Number of pages | 8 |
Journal | Powder Technology |
Volume | 183 |
Issue number | 2 |
DOIs | |
State | Published - Apr 9 2008 |
Externally published | Yes |
Keywords
- Alloy
- Bimetallic
- Core-and-Shell
- Nanoparticles
- Ru-Ni
- Spray-pyrolysis
ASJC Scopus subject areas
- Chemical Engineering(all)