AMORPHOUS IROX FILM PH SENSOR
First Claim
1. A pH sensing apparatus comprising:
- a flexible polymer substrate;
one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate;
a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode;
a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor;
a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode; and
wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of a substance contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes.
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Accused Products
Abstract
The present invention provides a pH sensing apparatus that includes a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, and a reference electrode corresponding to each amorphous iridium oxide film sensor electrode. Each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode. The amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of a substance contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes.
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Citations
20 Claims
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1. A pH sensing apparatus comprising:
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a flexible polymer substrate; one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate; a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode; a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor; a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode; and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of a substance contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20)
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8. A method for fabrication one or more pH sensors comprising the steps of
depositing a chromium layer and a gold layer on a flexible polymer substrate to define a sensor electrode and a first electrical contact pad; -
depositing a sacrificial layer on the first electrical contact pad and the flexible polymer substrate; coating the sacrificial layer and the sensor electrode with an iridium oxide thin film; heating the sensor electrode to form an amorphous iridium oxide sensor electrode; removing the sacrificial layer; depositing a chromium layer, a platinum layer and a silver layer on the flexible polymer substrate to define a reference electrode and a second electrical pad; and electroplating the silver layer. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A device for detecting spoilage in a food, comprising:
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a biocompatible pH sensing apparatus for physical contact with the food comprising; a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode, a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor, a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode, and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of the food contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes; a passive radio frequency identification chip electrically connected to the first and second electrical contact pads; and a tag antenna electrically connected to the passive radio frequency identification chip. - View Dependent Claims (16)
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17. A system for detecting spoilage in a food, comprising:
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a biocompatible pH sensing apparatus in physical contact with the food comprising; a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode, a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor, a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode, and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of the food contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes; a passive radio frequency identification chip electrically connected to the first and second electrical contact pads; a tag antenna electrically connected to the passive radio frequency identification chip; and a radio frequency identification reader comprising a computer connected to an antenna.
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18. A bandage for detecting a condition of a wound, comprising:
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a wound dressing material; a biocompatible pH sensing apparatus attached to the wound dressing material for physical contact with the wound comprising; a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode, a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor, a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode, and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of the wound contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes; a passive radio frequency identification chip electrically connected to the first and second electrical contact pads; and a tag antenna electrically connected to the passive radio frequency identification chip.
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19. A system for detecting a condition of a wound, comprising:
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a bandage containing a biocompatible pH sensing apparatus in physical contact with the wound, a passive radio frequency identification chip and a tag antenna electrically connected to the passive radio frequency identification chip; wherein the pH sensing apparatus comprises; a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode, a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor, a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode, and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of the wound contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes; wherein the passive radio frequency identification chip is electrically connected to the first and second electrical contact pads; and a radio frequency identification reader comprising a computer connected to an antenna.
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Specification