Ultramicroelectrode Ensembles. 5. Sealing Defects between the Ensemble Elementsand the Host Membrane with Octadecyltrichlorosilane

摘要

We have recently developed a new procedure for preparing ensembles ofultramicroelectrodes. This procedure entails filling the pores of a microporous host membrane with a conductive material. Nuclepore filters, with linear, cylindrical pores, were used as the host membranes. We have used this approach to prepare ultramicroelectrode ensembles based on Platinum and carbon paste electrode elements. The Pt-based ensembles were prepared by electrochemically depositing the metal into the pores of the host membrane. This was accomplished by attaching the Nuclepore membrane to an electrode surface, immersing this electrode into a solution of chloroplatinic acid, and repeatedly scanning the potential of this electrode through the Platinum hexachloride (2-) reduction wave. Deposition was continued until Pt was deposited through the pores, and well past the membrane/solution interface. The membrane surface was then sealed by vacuum-impregnating with molten polyethylene and polished to reveal the disk-shaped Pt ultramicroelectrode elements. Keywords: Electrolytes, Chlorodimethyl silane, Octadecyltrichlorosilane.