Two-terminal voltammetric microsensors
First Claim
1. An two-terminal voltammetric electrochemical sensor comprising:
- a working, electrode comprising surface confined chemically sensitive redox material and chemically insensitive redox material in a thickness functionally equivalent to that of a monolayer, wherein the two materials act as terminals anda counterelectrode having a surface area at least 102 larger than the surface area of the working electrode.
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Abstract
Self-assembly of a chemically insensitive redox material, such as ferrocenyl thiol, and a chemically sensitive redox material, such as a quinone thiol, onto microelectrodes forms the basis for a two-terminal, voltammetric microsensor having reference and sensor functions on the same electrode. Detection is based on measuring the potential difference of current peaks for oxidation and reduction of the reference (ferrocene) and indicator (quinone) in aqueous electrolyte in a two-terminal, linear sweep voltammogram using a counterelectrode of relatively large surface area. Use of microelectrodes modified with monolayer coverages of reference and indicator molecules minimizes the size of the counterelectrode and the perturbation of the solution interrogated. Key advantages are that the sensor requires no separate reference electrode and the sensor functions as long as current peaks can be located for reference and indicator molecules.
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Citations
14 Claims
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1. An two-terminal voltammetric electrochemical sensor comprising:
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a working, electrode comprising surface confined chemically sensitive redox material and chemically insensitive redox material in a thickness functionally equivalent to that of a monolayer, wherein the two materials act as terminals and a counterelectrode having a surface area at least 102 larger than the surface area of the working electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for making a two-terminal voltammetric sensor comprising
forming a working electrode having a chemically sensitive redox material and a chemically insensitive redox material confined on the surface of an electrically conductive substrate in a thickness functionally equivalent to that of a monolayer, wherein the two materials act as terminals, and a counter electrode having a surface area at least 102 larger than the surface area of the working electrode.
Specification