The first application of molecularly imprinted polymersto chemical sensors with capacitive detection is described.The sensitive layer was prepared by electropolymerizationof phenol on gold electrodes in the presence of thetemplate (phenylalanine). The insulating properties of thepolymer layer were studied by electrochemical impedancespectroscopy. Electrical leakages through the polymerlayer were suppressed by deposition of a self-assembledmonolayer of mercaptophenol before polymerization andof alkanethiol after polymerization. At the final stage ofsensor preparation, the template was removed. The multilayer system obtained displayed a decrease in electricalcapacitance on addition of phenylalanine. Only a lowresponse was observed toward other amino acids andphenol.