Particle and Aerosol Research Vol. 5, No. 2, June 2009 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Morphological control and electrostatic deposition of silver nanoparticles produced by condensation-evaporation method
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Abstracts
This paper describes a condensation-evaporation method (CEM) to produce size-controlled spherical silver nanoparticles
by perturbing coagulation and coalescence processes in the gas phase. Polydisperse silver nanoparticles
generated by the CEM were first introduced into a differential mobility analyzer (DMA) to select a group of silver
nanoparticles with same electrical mobility, which also enables to make a group of nanoparticles with elongated
structures and same projected area. These silver nanoparticles selected by the DMA were then in-situ sintered at
~600�C, and then they were observed to turn into spherical shaped nanoparticles by the rapid coalescence process.
With the assistance of modified converging-typed quartz reactor, we can also produce the 10 times higher number
concentration of silver nanoparticles compared with a general quartz reactor with uniform diameter. Finally, the
spherical silver nanoparticles with 30 nm were electrostatically deposited on the surface of silicon substrate with
the coverage rate of ~4%/hr. This useful preparation method of size-controlled monodisperse silver nanoparticles
developed in this work can be applied to the various studies for characterizing the physical, chemical, optical, and
biological properties of nanoparticles as a function of their size.
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