Strip electrode with conductive nano tube printing
First Claim
1. An electrochemical test device for determining the presence or concentration of an analyte in an aqueous fluid sample, said electrochemical test device comprising:
- (a) a substrate, the substrate comprising a non-conductive material;
(b) a working electrode comprising a conductive film formed with carbon nanotubes and other conductive and non conductive materials affixed to the non-conductive coating, said working electrode having a first electrode area, a first lead and a first contact pad;
(c) a counter electrode comprising an conductive film formed with carbon nanotubes and other conductive and non conductive materials affixed to the non-conductive substrate, said counter electrode having a second electrode area, a second lead and a second contact pad; and
(d) a reagent capable of reacting with the analyte to produce a measurable change in potential which can be correlated to the presence or concentration of the analyte in the fluid sample, said reagent overlaying at least a portion of the first electrode area of the working electrode.
2 Assignments
0 Petitions
Accused Products
Abstract
A sensor system that detects a current representative of a compound in a liquid mixture features a multi or three electrode strip adapted for releasable attachment to signal readout circuitry. The strip comprises an elongated support which is preferably flat adapted for releasable attachment to the readout circuitry; a first conductor and a second and a third conductor each extend along the support and comprise means for connection to the circuitry. The circuit is formed with single-walled or multi walled nanotubes conductive traces and may be formed from multiple layers or dispersions containing, carbon nanotubes, carbon nanotubes/antimony tin oxide, carbon nanotubes/platinum, or carbon nanotubes/silver or carbon nanotubes/silver-cloride. An active electrode formed from a separate conductive carbon nanotubes layer or suitable dispersion, positioned to contact the liquid mixture and the first conductor, comprises a deposit of an enzyme capable of catalyzing a reaction involving the compound and preferably an electron mediator, capable of transferring electrons between the enzyme-catalyzed reaction and the first conductor. A reference electrode also formed from a conductive carbon nanotube layer or suitable dispersion is positioned to contact the mixture and the second conductor. The system includes circuitry adapted to provide an electrical signal representative of the current which is formed from printing conductive inks made with nano size particles such as conductive carbon or carbon/platinum or carbon/silver, or carbon nanotubes/antimony tin oxide to form a conductive carbon nanotube layers. The multiple-electrode strip is manufactured, by then applying the enzyme and preferably the mediator onto the electrode. Alternatively the electrode can have a carbon nanotubes/antimony tin oxide, carbon nanotubes/platinum, or carbon nanotubes/silver or carbon nanotubes/silver-cloride surface and or a conductive carbon or silver ink surface connecting leg. The carbon nanotube solution is first coated and patterned into electro shapes and the conductive carbon nanotubes, carbon or silver ink can be attached by printing the ink to interface with the carbon nanotube electro surface. A platinum electrode test strip is also disclosed that is formed from either nano platinum distributed in the carbon nanotube layer or by application or incorporation of platinum to the carbon nanotube conductive ink.
-
Citations
77 Claims
-
1. An electrochemical test device for determining the presence or concentration of an analyte in an aqueous fluid sample, said electrochemical test device comprising:
-
(a) a substrate, the substrate comprising a non-conductive material;
(b) a working electrode comprising a conductive film formed with carbon nanotubes and other conductive and non conductive materials affixed to the non-conductive coating, said working electrode having a first electrode area, a first lead and a first contact pad;
(c) a counter electrode comprising an conductive film formed with carbon nanotubes and other conductive and non conductive materials affixed to the non-conductive substrate, said counter electrode having a second electrode area, a second lead and a second contact pad; and
(d) a reagent capable of reacting with the analyte to produce a measurable change in potential which can be correlated to the presence or concentration of the analyte in the fluid sample, said reagent overlaying at least a portion of the first electrode area of the working electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77)
-
-
37. A multi-layered structure comprising:
- an electrically conductive film comprising a plurality of nanotubes with an outer diameter of less than 10 nm; and
a polymeric layer disposed on at least a portion of said electrically conductive film. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
- an electrically conductive film comprising a plurality of nanotubes with an outer diameter of less than 10 nm; and
- 55. A dispersion of nanotubes comprising a plurality of nanotubes with an outer diameter of less than 10 nm.
Specification