Electrochemical sensor ink compositions, electrodes, and uses thereof
The invention is directed to conductive polymer compositions, catalytic ink compositions (e.g., for use in screen-printing), electrodes produced by deposition of an ink composition, as well as methods of making, and methods of using such compositions and electrodes. An exemplary ink material comprises a metal catalyst (e.g., platinum black and/or platinum-on-carbon), graphite as a conducting material, a polymer binding material, and an organic solvent. In one aspect, the polymer binding material comprises a polymer binder blend comprising first and second polymers, wherein the first polymer has a glass transition temperature higher than the second polymer. In a second aspect, the polymer binding material comprises a hydrophilic acrylic polymer, copolymer, or terpolymer. The conductive polymer compositions of the present invention may be used, for example, to make electrochemical sensors. Such sensors may be used, for example, in a variety of devices to monitor analyte amount or concentrations in subjects.
1. A method of making an electrode, the method comprising:
mixing together a composition having a transition metal catalyst, electrically conductive material, a polymer blend of a first polymer mixture having a different glass transition temperature and molecular weight than the glass transition temperature and molecular weight of a second polymer mixture, and a solvent; wherein the polymer blend is selected from the group consisting of acrylic homopolymers, acrylic copolymers, acrylic terpolymers, and mixtures thereof;
depositing the composition on a non-conductive substrate; and
removing the solvent.
2. The method of claim 1 , wherein the acrylic polymers, copolymers or terpolymers comprises hydrophilic and prepared from polymerized acrylic acid monomers having additional hydrophilic functional groups on the alpha-carbon of the acrylic acid backbone, beta-carbon of the acrylic acid backbone, the pendant carboxyl-group on the alpha-carbon of the acrylic acid backbone, or combinations thereof.
3. The method of claim 1 , wherein the mixing comprises adding one or more solvents consisting essentially of alkyl ketones, aryl ketones, aromatic hydrocarbons, glycol acetates, glycol diacetates, and mixtures thereof.
4. The method of claim 1 , wherein the depositing comprises printing the composition on a polyester substrate.
5. The method of claim 1 , wherein the glass transition temperature of the first polymer mixture comprises a higher value than the glass transition temperature of the second polymer mixture and the molecular weight of the first polymer mixture comprises a higher value than the molecular weight of the second polymer mixture.