Role of reactive species in processing materials at laboratory temperature by spray plasma devices |
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Authors: | Mehrdad Nikravech Kamal Baba Bernard Leneindre Frédéric Rousseau |
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Institution: | 1.LSPM-CNRS, Institute Galilée,University of Paris 13,Villetaneuse,France;2.LGPPTS-ENSCP,University Pierre and Marie Curie,Paris,France |
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Abstract: | Processing the aerosol of metal salts in non-equilibrium plasma represents a promising technique that combines the advantages
of spray pyrolysis with the high reactivity of plasmas at nearlaboratory temperature in order to produce mixed-oxides and
perovskite materials. The aim of this paper is to describe the principles of this new technique and to present the various
applications and latest developments. This technique’s capacity to deposit various mixed metal oxides with precise stoichiometry
is demonstrated. It is shown that oxidant plasma species play a key role in the chemical transformation of starting materials
into oxides at laboratory temperature, while the configuration of the reactor determines the morphology and texture of the
deposited layers. Two different reactor configurations are presented. The porous layers of La
x
Sr1−x
MnO3 as the cathode for fuel cells were synthesised in a wave shock reactor configuration, while nanostructured ZnO-Al layers
to form a transparent conductive cathode for photovoltaic cells were deposited in the spray plasma reactor of the latest generation
for this technique. The experimental results emphasise the role of plasma species in the rate of chemical reactions and in
the chemical composition of the deposited layers. |
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