Enhanced conductivity of thin film polyaniline by self-assembled transition metal complexes.
In a recent study, the transition metal complex, cis-dichlorobis(2-,2'-dipyridyl)ruthenium (II) (Ru(bpy)2Cl2), and the macrocycle Ru(TPP)CO (TPP:- tetraphenylporphine) were bound to pyridine terminated self-assembled monolayers on quartz. Following modification of the quartz surface with metal complexes, the conducting polymer polyaniline was deposited via in situ polymerization. The sheet conductivity (as measured by the four-probe method) of the resulting polyaniline films deposited onto Ru(bpy)2Cl2 and Ru(TPP)CO surfaces was significantly enhanced relative to films deposited onto unmodified quartz. It is postulated that either the macrocycle or the transition metal complex-modified surface interacts with the conducting polymer as it is forming, resulting in a more ordered expanded coil conformation for the polymer. The net result of such an interaction is a thin film possessing significantly greater electrical conductivity.
Sarno
David M
DM
Chemistry Department and Institute for Materials Research, Binghamton University, Binghamton, New York 13902, USA.
Martin
Justin J
JJ
Hira
Steven M
SM
Timpson
Cliff J
CJ
Gaffney
Jean P
JP
Jones
Wayne E
WE