Electrophoretic Deposition of Transparent ZnO Thin Films from Highly Stabilized Colloidal Suspensions

[Display omitted] ► Role of PEIs molecular weight on its adsorption to ZnO nanoparticles was studied. ► PEI forms a jellyfish-like structure with the ZnO nanoflakes. ► Highly stable suspensions were obtained with PEI with the highest molecular weight. ► Densely oriented green ZnO thin films were obt...

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Bibliographic Details
Published in:Journal of colloid and interface science 2012-05, Vol.373 (1), p.27-33
Main Authors: Verde, M., Peiteado, M., Caballero, A.C., Villegas, M., Ferrari, B.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Colloids
Deposition
Dispersions
electrolytes
electrophoresis
Electrophoretic deposition
Exact sciences and technology
General and physical chemistry
Molecular weight
Nanoflakes
nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Polyetherimides
Polyethylenimine
spectroscopy
Stabilization
stainless steel
Thin films
Zinc oxide
ZnO
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Summary:[Display omitted] ► Role of PEIs molecular weight on its adsorption to ZnO nanoparticles was studied. ► PEI forms a jellyfish-like structure with the ZnO nanoflakes. ► Highly stable suspensions were obtained with PEI with the highest molecular weight. ► Densely oriented green ZnO thin films were obtained by EPD from these suspensions. The parameters that control the stability of ZnO-nanoparticles suspensions and their deposition by electrophoretic deposition were studied, so as to organize the assembly and compaction of nanoparticles. The addition of cationic polyelectrolyte – Polyethylenimine (PEI) – with different molecular weights was investigated, in order to study their effectiveness and the influence of the molecular weight of the organic chain on suspensions dispersion. It was found that PEI with the highest molecular weight provided better dispersion conditions. Cathodic EPD was performed under previously optimized suspensions conditions and over electropolished stainless steel substrates. Experimental results showed that the EPD process in these conditions allows obtaining dense transparent ZnO thin films. Deposition times and intensities were optimized by analyzing the resulting thin films characteristics. Finally, the deposits were characterized by FE-SEM, AFM, and different spectroscopic techniques.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2011.09.039