| abstract |
An electrochemical probe (e.g. 6, Fig. 14) has a plurality of wire electrodes, each having a conductive core and outer insulating layer of no more than 40 μm diameter, arranged alongside each other. The probe is formed by laying the electrodes into channels 5 disposed, maybe by photolithography, on the surface of a sheet of material 4, e.g. a flexible polymer. The sheet is manipulated into a bundle: in a cross-section of the bundle, the sheet traces out a predetermined shape, and the distribution of electrodes depend on that shape and on a predetermined spacing (e.g. 20 μm) of the channels in the sheet. Sheets may be stacked, folded or rolled to form multiple layers in the bundle, perhaps with a hollow channel. The lengths of protruding ends of the wires may be controlled, e.g. tapered. Metal or metal oxide nanostructures may be deposited on the tips of the wires. |