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) |
|---|---|
| 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 |
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Keywords
- Alloy
- Bimetallic
- Core-and-Shell
- Nanoparticles
- Ru-Ni
- Spray-pyrolysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physical and Theoretical Chemistry
Cite this
Direct synthesis of Ru-Ni core-and-shell nanoparticles by spray-pyrolysis : Effects of temperature and precursor constituent ratio. / Pingali, Kalyana C.; Deng, Shuguang; Rockstraw, David A.
In: Powder Technology, Vol. 183, No. 2, 09.04.2008, p. 282-289.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Direct synthesis of Ru-Ni core-and-shell nanoparticles by spray-pyrolysis
T2 - Effects of temperature and precursor constituent ratio
AU - Pingali, Kalyana C.
AU - Deng, Shuguang
AU - Rockstraw, David A.
PY - 2008/4/9
Y1 - 2008/4/9
N2 - 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.
AB - 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.
KW - Alloy
KW - Bimetallic
KW - Core-and-Shell
KW - Nanoparticles
KW - Ru-Ni
KW - Spray-pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=40749084376&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=40749084376&partnerID=8YFLogxK
U2 - 10.1016/j.powtec.2007.07.026
DO - 10.1016/j.powtec.2007.07.026
M3 - Article
VL - 183
SP - 282
EP - 289
JO - Powder Technology
JF - Powder Technology
SN - 0032-5910
IS - 2
ER -