Ultrasmall Platinum Research Articles

Pulse voltammetry in single cells using platinum microelectrodes

Abstract : Multiple pulse voltammetry at platinum microelectrodes is described for intracellular measurements. In this technique, a sequence of three potential pulses is used for each current point measured. This pulse sequence provides a fixed cathodic activation potential and a fixed anodic cleaning potential before a varying detection potential, at which the current is measured. Voltammetric information is obtained by ramping the detection potential stepwise through the potential range of interest. The multiple pulse voltammetry technique has been applied to the study of the oxidation of potassium ferrocyanide, glucose and several catechols at platinum microdisk electrodes. In addition, this technique has been applied at ultrasmall platinum ring electrodes to reduce electrode fouling during intracellular voltammetry. In these in vivo experiments, the electrode response is degraded by only 30% after 40 minutes of intracellular multiple pulse. Voltammetry, Platinum electrodes, Intracellular measurements.

Novel method of producing ultrasmall platinum silicide gate electrodes

A novel method has been developed for producing platinum silicide gate electrodes with submicron width. A lateral chemical reaction of platinum with polycrystalline silicon at a step edge was used. The width of the wire is determined by the thickness of a sputtered metal layer. Wires with width between 35 and 300 nm have been produced. The method has been used for making long-channel field-effect transistors with good device properties. Some preliminary results of the study of the low-temperature electrical transport properties of inversion layers with width of 0.12 μm are reported.