Tl. Panasyuk et al., Electropolymerized molecularly imprinted polymers as receptor layers in a capacitive chemical sensors, ANALYT CHEM, 71(20), 1999, pp. 4609-4613
The first application of molecularly imprinted polymers to:chemical sensors
with capacitive detection is described. The sensitive layer was prepared b
y electropolymerization of phenol on gold electrodes in the presence of the
template (phenylalanine). The insulating properties of the polymer layer w
ere studied by electrochemical impedance spectroscopy. Electrical leakages
through the polymer layer were suppressed by deposition of a self-assembled
monolayer of mercaptophenol before polymerization and of alkanethiol after
polymerization. At the final stage of sensor preparation, the template was
removed. The multilayer system obtained displayed a decrease in electrical
capacitance on addition of phenylalanine. Only a low response was observed
toward other amino acids and phenol.