Integrated electrochemical microsensors and microsystems for direct reliable chemical analysis of compounds in complex aqueous solutions
First Claim
1. A microsensor for voltametric techniques allowing the measurement of concentration of at least one chemical compound with small molecular weight under organic, inorganic, neutral or ionic form, in complex aqueous environment, said microsensor comprising an array of microelectrodes, assembled on a chip supported by an isolating substrate, and linked to a contact allowing the connection to a measuring apparatus with at least one conductor protected by an isolating layer, wherein said microsensor is totally coated with an hydrophilic gel which is chemically inert with respect to the chemical compound, is hydrated at a level of at least 70%, and has a thickness in the range of 50 μ
- m to 5,000 μ
m representing at least 10 times the diameter of the microelectrodes, said diameter ranging from 0.5 to 30 μ
m, and said gel is a screen against interfering macromolecular or colloidal compounds as against hydrodynamic flux.
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Abstract
A microsensor for electrochemical measurements allowing the determination of concentration or concentration profile of at least one chemical compound with small size or molecular weight, under organic, inorganic, neutral or ionic form in an aqueous environment. The microsensor comprises an array (15) of microelectrodes (16), assembled on a chip (10) supported by an isolating substrate (7), and linked with at least one conductor protected by an insulating layer to a contact allowing the connection to a measuring apparatus. The said microsensor is totally coated with an hydrophilic gel (25) which is chemically inert with respect to the chemical compound, is hydrated at a level of at least 70 %, and has a thickness superior to 10 times the size of the microelectrodes (16). And an integrated electrochemical microsystem including the microsensor.
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Citations
20 Claims
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1. A microsensor for voltametric techniques allowing the measurement of concentration of at least one chemical compound with small molecular weight under organic, inorganic, neutral or ionic form, in complex aqueous environment, said microsensor comprising an array of microelectrodes, assembled on a chip supported by an isolating substrate, and linked to a contact allowing the connection to a measuring apparatus with at least one conductor protected by an isolating layer, wherein said microsensor is totally coated with an hydrophilic gel which is chemically inert with respect to the chemical compound, is hydrated at a level of at least 70%, and has a thickness in the range of 50 μ
- m to 5,000 μ
m representing at least 10 times the diameter of the microelectrodes, said diameter ranging from 0.5 to 30 μ
m, and said gel is a screen against interfering macromolecular or colloidal compounds as against hydrodynamic flux. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- m to 5,000 μ
Specification