Electrodeposition and characterization of polypyrrole films on aluminium alloy 6061-T6

Martins, Natércia C. T.; Silva, Teresa M.; Montemor, M.F.; Fernandes, João; Ferreira, M.G.S.

doi:10.1016/j.electacta.2008.01.059

Cited by 89 publications

(52 citation statements)

References 27 publications

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“…Figure 11a illustrates how the polymer was formed along the lines of the substrate, showing a globular morphology of sizes ranging from 4 to 5μm with a few smaller outer cores on the surface, which are highlighted on the entire matrix of the polymer. This globular morphology, as previous reported, is typical of polypyrrole when formed by electropolymerization either by potentiostatic or galvanostatic methods (Lehr and Saidman, 2007;Lu et al, 2006;Martins et al, 2008;Nie et al, 2008). In Figures 11b and 11c the same globular morphology is observed.…”

Section: Electrochemical Polymerizationsupporting

confidence: 70%

See 1 more Smart Citation

Electrodeposition of Polypyrrole Films: Influence of Fe3O4 Nanoparticles and Platinum Co-Deposition

Montoya¹,

Marín²,

Calderón³

et al. 2012

Aspects on Fundaments and Applications of Conducting Polymers

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Section: Electrochemical Polymerizationsupporting

confidence: 70%

“…(1). The typical globular morphology is observed (Lehr and Saidman, 2007;Martins et al, 2008). The Figure 16b presents a polypyrrole obtained in 0.25M of H 2 SO 4 , PPy (2).…”

Section: Characterization 521 Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Electrodeposition of Polypyrrole Films: Influence of Fe3O4 Nanoparticles and Platinum Co-Deposition

Montoya¹,

Marín²,

Calderón³

et al. 2012

Aspects on Fundaments and Applications of Conducting Polymers

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“…The possible chemical reactions that occur on aluminum surfaces coated by PPy films during the polarization experiments are represented below. 28,29 Anodic reactions Cathodic reactions…”

Section: Corrosion Testsmentioning

confidence: 99%

Electrodeposition of polypyrrole films on aluminum surfaces from a p-toluene sulfonic acid medium

2009

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Electrodeposition of polypyrrole films on aluminum from aqueous solutions containing p-toluene sulfonic acid and pyrrole was performed by cyclic voltammetry and galvanostatic technique. The influence of applied current density on the morphology of the films was studied by Scanning Electron Microscopy. The films displayed a cauliflower-like structure consisting of micro-spherical grains. This structure is related to dopand intercalation in the polymeric chain. Films deposited at higher current density were more susceptible to the formation of pores and defects along the polymeric chain than films deposited at lower current density. These pores allow the penetration of aggressive species, thereby favoring the corrosion process.

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“…The morphology of PPy is well documented and in general it appears to have a cauliflower-like surface [33][34][35]. However, the micrograph of PPyDF, seen in Fig.…”

Section: Morphology Of Ppydfmentioning

confidence: 98%

The effect of dopant pKa and the solubility of corresponding acid on the electropolymerisation of pyrrole

Ryan

Breslin

Moulton

et al. 2013

Electrochimica Acta

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a b s t r a c tIn this paper, attempts to dope polypyrrole (PPy) with two small sized anionic drugs, diclofenac sodium salt (NaDF) and valproic acid sodium salt (NaVPA), are described. For PPy doped with DF − , unusual patterns in growth and morphology were observed. During the deposition of the polymer, the rate of electropolymerisation decreased with increasing time and higher applied potentials. The polymer had features of an insulating film, while SEM confirmed the presence of crystal-like shards on the surface of the polymer. Analyses of these crystals indicate them to be drug that may have precipitated out of solution. These findings suggest that insoluble drug crystals are formed during electropolymerisation. The formation of PPy doped with a small soluble anti-epilepsy anionic drug, VPA − , was also studied; however it was not possible to incorporate this drug during electrochemical polymerisation. Again, this was explained in terms of the equilibrium between the anion and the acid forms of VPA. At pH values below 5.6, the equilibrium of the VPA − is shifted towards the insoluble HVPA. As the monomer is oxidised, there is a decrease in the local pH in the vicinity of the electrode and this causes the HVPA to precipitate from solution. This, in turn, prevents any PPy from being deposited at the electrode.

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Electrodeposition and characterization of polypyrrole films on aluminium alloy 6061-T6

Cited by 89 publications

References 27 publications

Electrodeposition of Polypyrrole Films: Influence of Fe3O4 Nanoparticles and Platinum Co-Deposition

Electrodeposition of Polypyrrole Films: Influence of Fe3O4 Nanoparticles and Platinum Co-Deposition

Electrodeposition of polypyrrole films on aluminum surfaces from a p-toluene sulfonic acid medium

The effect of dopant pKa and the solubility of corresponding acid on the electropolymerisation of pyrrole

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