Adjustment of sensor sensitivity by controlling copolymer film thickness through a controlled drying step
First Claim
1. A method, comprising:
- depositing a mixture on a surface of an electrode, wherein the mixture comprises an analyte sensing component, an initiator, a first methacrylate monomer having a first hydrophilic side chain, a dimethacrylate monomer, and a second methacrylate monomer having a second hydrophilic side chain, wherein the initiator is sensitive to light;
exposing the deposited mixture to a controlled environment for a specified period of time; and
photopolymerizing the exposed deposited mixture to form a copolymer layer disposed on the surface of the electrode, whereby the analyte sensing component has a non-uniform concentration in the formed copolymer layer such that the concentration is higher proximate the surface of the electrode, wherein photopolymerizing comprises exposing the exposed deposited mixture to light.
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Accused Products
Abstract
An analyte sensor and a method for making the analyte sensor are disclosed. In one aspect, the analyte sensor includes a crosslinked, hydrophilic copolymer in contact with a surface of an electrode, and an analyte sensing component embedded within the crosslinked, hydrophilic copolymer. The method of making the analyte sensor includes depositing a precursor mixture containing monomers and an analyte sensing component onto an electrode, exposing the deposited precursor mixture to a controlled environment for a specified period of time, and photopolymerizing the deposited exposed precursor mixture into a copolymer layer in contact with a surface of the electrode. Exposing the deposited precursor mixture to a controlled environment can increase the sensitivity of the sensor by reducing the thickness of the copolymer layer and/or by causing the analyte sensitive component within the copolymer layer to have a non-uniform concentration within the layer.
23 Citations
25 Claims
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1. A method, comprising:
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depositing a mixture on a surface of an electrode, wherein the mixture comprises an analyte sensing component, an initiator, a first methacrylate monomer having a first hydrophilic side chain, a dimethacrylate monomer, and a second methacrylate monomer having a second hydrophilic side chain, wherein the initiator is sensitive to light; exposing the deposited mixture to a controlled environment for a specified period of time; and photopolymerizing the exposed deposited mixture to form a copolymer layer disposed on the surface of the electrode, whereby the analyte sensing component has a non-uniform concentration in the formed copolymer layer such that the concentration is higher proximate the surface of the electrode, wherein photopolymerizing comprises exposing the exposed deposited mixture to light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An analyte sensor comprising:
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an electrode; a layer on a surface of the electrode, wherein the layer comprises; a crosslinked, hydrophilic copolymer; and an analyte sensing component embedded within the crosslinked, hydrophilic copolymer, wherein the analyte sensing component has a non-uniform concentration in the layer, such that the concentration is higher proximate the surface of the electrode, wherein the crosslinked, hydrophilic copolymer comprises backbone chains comprising; first methacrylate-derived units, each having a first hydrophilic side chain; second methacrylate-derived units, each having a second hydrophilic side chain, wherein the first and second side chains are the same or different; third methacrylate-derived units; and hydrophilic crosslinks between third methacrylate-derived units in different backbone chains. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification