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working electrode, which may cause problems
such as overoxidation of the product polymers.
5.8.3 Conditions for Electrochemical
Polymerization
The concentration of monomer is one
important factor in electrochemical
polymerization. If the polymerization does not
proceed at the electrode surface, the use of a lot
of monomer may be effective to promote film
formation of the conducting polymers. The
choice of material for the working electrode is
also important in terms of not only
overpotential but also compatibility with
conducting polymer films.
In addition to conventional electrolytic
solutions such as the supporting salt/solvent,
room temperature ionic liquids are known to be
suitable as polymerization media [94]. There
are several advantages of electropolymerization
in ionic liquids: (i) electropolymerization
proceeds rapidly, (ii) the compatibility of the
product film with the electrode surface is good
and (iii) product polymers have a dense and
smooth surface, high electric conductivity, high
electrochemical
capacitance
and
good
reversibility of redox cycles.
Recently boron trifluoride-ether complex has
been shown to be attractive as a polymerization
medium [95]. Boron trifluoride acts as a Lewis
acid to form a complex with aromatic
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