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1 Polish Journal of Chemistry

1 2004

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Design of Ferrocene Organothiol Monolayer as Intermediate Phase for Miniaturized Electrochemical sensors with Gold Contact

Sęk S., Bilewicz R., Grygołowicz-Pawlak E., Grudzień I., Brzózka Z., Malinowska E.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1655-1665

New design of back side contact (BSC) chips for miniaturized electrochemical sensors with Au contact modified by monolayers of purposely synthesized organothiol molecules is described. Voltammetric studies of the monolayers indicate reversible behavior of the compounds and efficient coverage of the gold electrode. Properties of 5 compounds are compared. The electroactive benzenethiol based self-assembled monolayer is selected as a convenient intermediate layer in solid contact potentiometric sensors since it forms a hydrophobic barrier between the electrode and the solution and at the same time provides efficient electronic wiring to the electrode. Stable electrode performance is obtained and the potentiometric response remains as fast as using bare gold contact which should be favorable for the application of the described intermediate layers in ion-selective electrodes.