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2 Polish Journal of Chemistry

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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.

Electrochemical Behavior of Mixed Self-Assembled Monolayers of Azobenzene and Alkanethiol

Wang Z., Li H. L.

Polish Journal of Chemistry

2001

Vol. 75, nr 5

699-706

The self-assembly and electrochemical properties of mixed self-assembled monolayer (SAMs) of 4-methoxy-4_-(N-(2__-mercaptoethyl)amino)carbonyl)azobenzene (C1AzoC2SH) and 1-butanethiol (C4SH) were studied on the gold electrode by cyclic voltammetry. Usually the azobenzene groups exhibit very sluggish electron-transfer kinetics in the densely packed films. The alkanethiol as the spacer molecule was introduced to the azobenzene monolayer system to weaken the intermolecular interaction in order to enhance the electrochemical activity of the azobenzene group. Under the different molar ratios of C1AzoC2SH and C4SH we obtain a different electrochemical response and an apparent surface electrochemical rate constant. The experimental results suggested that the azobenzene groups exhibit a higher electrochemical activity in the mixed SAMs systems.