Surface reactivity of polypyrrole/iron-oxide nanoparticles: electrochemical and CS-AFM investigations |
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Authors: | A Pailleret N T L Hien D T M Thanh C Deslouis |
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Institution: | (1) UPR 15 CNRS—LISE, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France;(2) Institute of Tropical Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam |
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Abstract: | Composite materials based on iron-oxide nanoparticles (magnetite, hematite, and maghemite) and tetraoxalate-doped polypyrrole
(PPy) were electrochemically generated from aqueous solutions. Their composition was determined using electrochemical quartz
crystal microbalance experiments. The oxide percentage in mass was found to vary from 17 to 27% depending on the oxide identity.
They were all shown to be fascinating candidates as protective materials against corrosion of iron and carbon steel materials
although maghemite-nanoparticle-loaded polypyrrole films offer the best performances. An anionic surfactant (sodium dodecylsulfate)
was added to the electrodeposition solution to avoid the formation of clusters. These anions were also shown to improve the
conductivity of the resulting PPy films, while the presence of oxide nanoparticles tends to decrease this same surface conductivity.
On the other hand, the correlation between the morphology and the local conductivity appears to be more obvious in the absence
of anionic surfactants than in their presence. This aspect is discussed although it still needs further investigation.
Contribution to the International Workshop on Electrochemistry of Electroactive Materials (WEEM-2006), Repino, Russia, 24–29
June 2006. |
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Keywords: | Polypyrrole Iron-oxide nanoparticles Composite materials CS-AFM Corrosion |
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