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Particle generation by cosolvent spray pyrolysis: Effects of ethanol and ethylene glycol

Published online by Cambridge University Press:  06 August 2012

Kai Zhong ,
George Peabody ,
Howard Glicksman  and
Sheryl Ehrman
Kai Zhong
Affiliation:
Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland20742
George Peabody
Affiliation:
Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland20742
Howard Glicksman
Affiliation:
Department of Microcircuit Materials, DuPont Electronic Technologies, Research Triangle Park, North Carolina27709
Sheryl Ehrman*
Affiliation:
Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland20742
*
a)Address all correspondence to this author. e-mail: sehrman@eng.umd.edu
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Abstract

A cosolvent spray pyrolysis process was used for the generation of micrometer-sized pure copper particles. Ethylene glycol (EG) and ethanol (ET) were selected as cosolvents, and their effects on particle morphology and composition were systematically investigated. Experimental results showed that oxide-free copper particles could be generated at temperatures greater than 400 °C with either cosolvent. Hollow particles with cracks were generated with ET at temperatures from 400 to 1000 °C, whereas EG promoted the formation of porous particles at temperatures up to 600 °C and hollow shell particles with smooth surfaces at 875 and 1000 °C. Results from short residence time experiments indicated that, during the generation process, lamellar and fragment-like copper hydroxy nitrate [Cu2(OH)3NO3] precipitated when EG and ET were used respectively. Cu2(OH)3NO3 then decomposed to cupric oxide (CuO) and cuprous oxide (Cu2O). Finally the oxides were reduced to copper (Cu) in the reducing atmosphere created by EG and ET.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 19 , 14 October 2012 , pp. 2540 - 2550
Copyright
Copyright © Materials Research Society 2012

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