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Effect of Reflux Time on Nanoparticle Shape

Published online by Cambridge University Press:  19 February 2014

Chandan Srivastava  and
Sushma KVL
Chandan Srivastava*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Sushma KVL
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
*Corresponding author. [email protected]
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Abstract

In the present work, Pt nanoparticles were produced from a reaction mixture containing a trace amount of cobalt carbonyl salt acting as a shape inducer. Nanoparticle shape evolution during reaction mixture reflux was monitored by characterizing particles extracted from the reaction mixture at different times. It was observed that 5 min of reflux produced spherical nanoparticles, 30 min of reflux produced cube shaped nanoparticles, and 60 min of reflux produced truncated octahedron morphology nanoparticles. It is illustrated that during nanoparticle synthesis the reflux process can provide energy needed for shape transformation from a metastable cube morphology to a truncated octahedron morphology which is thermodynamically the most stable geometry for fcc crystals. An optimization of the reaction reflux is thus needed for isolating metastable shapes.

Keywords

Pt nanoparticlesshapereaction refluxcube
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 20 , Issue 3 , June 2014 , pp. 847 - 851
Copyright
© Microscopy Society of America 2014 

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