Electrodes and their use in analysis
First Claim
1. A method for indicating the concentration of a substance in solution comprising passing an alternating voltage between a first electrode structure having coated thereon a polymer, the polymer being in one of an oxidised and a reduced state between which states its conductivity varies, and a second separate counter electrode in said solution;
- and measuring the change in conductivity of the polymer coating resulting from a chance in the state of the polymer due to a transfer of charge between the substance and the polymer, such measurement being representative of the state of the polymer and thereby of the concentration of said substance in the solution.
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Abstract
A method for indicating the concentration of a substance in solution includes passing an alternating voltage between a first electrode structure having coated thereon a polymer and a second separate counter electrode in the solution. The polymer is in one of an oxidized and a reduced state, between which states its conductivity varies. Changes in the conductivity of the polymer coating are measured, the measurement being representative of the state of the polymer and thereby of the concentration of the substance in the solution. Electrodes for use in this method are also described.
267 Citations
19 Claims
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1. A method for indicating the concentration of a substance in solution comprising passing an alternating voltage between a first electrode structure having coated thereon a polymer, the polymer being in one of an oxidised and a reduced state between which states its conductivity varies, and a second separate counter electrode in said solution;
- and measuring the change in conductivity of the polymer coating resulting from a chance in the state of the polymer due to a transfer of charge between the substance and the polymer, such measurement being representative of the state of the polymer and thereby of the concentration of said substance in the solution.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 10. An electrode structure forming a single electrode in a circuit comprising an elongate electrode having an exposed face over which a polymer is coated, the polymer being in one of an oxidised and a reduced state between which states its conductivity varies.
- 16. An electrode structure forming a single electrode in a circuit comprising a carbon microband electrode having one or more carbon electrodes inter-layered with insulating dielectric layers printed on a substrate, each carbon electrode having an exposed end of carbon over which a polymer is coated, the polymer being in one of an oxidised and a reduced state between which states its conductivity varies.
Specification