Understanding of electrochemical and structural changes of polypyrrole/polyethylene glycol composite films in aqueous solution

► Electrochemical monitoring of PPy and PPy–PEG films over immersion time. ► Electrochemical and surface analysis showed that PEG improves the stability of PPy films. ► Mott–Schottky analysis reveals p-type conductance for both films. ► In situ AFM analysis sustains electrochemical behaviour. ► A mo...

Full description

Saved in:
Bibliographic Details
Published in:Electrochimica acta 2011-11, Vol.56 (27), p.9893-9903
Main Authors: Pirvu, Cristian, Manole, Claudiu Constantin, Stoian, Andrei Bogdan, Demetrescu, Ioana
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous solutions
Capacitance
Cations
Composite film
Constraining
Doping–undoping
Electrical, magnetic and optical properties
Exact sciences and technology
Immersion
In situ AFM
Organic polymers
Physicochemistry of polymers
Polyethylene glycol
Polypyrrole
Polypyrroles
Properties and characterization
Rendering
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► Electrochemical monitoring of PPy and PPy–PEG films over immersion time. ► Electrochemical and surface analysis showed that PEG improves the stability of PPy films. ► Mott–Schottky analysis reveals p-type conductance for both films. ► In situ AFM analysis sustains electrochemical behaviour. ► A model of PPy and PPy–PEG films behaviour during immersion was elaborated. Electrochemical monitoring of electrical and structural changes of both PPy and PPy–PEG films electrochemical deposited, in order to highlight if the structural stability offered by PEG has an influence on electrical properties and stability in aqueous solution over immersion time was investigated. Electrochemical analysis suggests that PPy–PEG film inserts cations easier than PPy film for a short immersion time probably due to ability of PEG to form complexes with metal cations. The FTIR spectra showed that the PEG incorporation decreases the rate of PPy overoxidation probably by restraining the electron release and by rendering O2 inaccessible to PPy. Mott–Schottky analysis based on capacitance measurement reveal p-type conductance for both films. The in situ AFM analysis sustains electrochemical behaviour and has permitted elaboration of a model of PPy and PPy–PEG films behaviour during immersion in testing solution.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2011.08.061