Polymer nanofiber-based electronic nose
First Claim
1. A chemical sensor comprising:
- a plurality of fibers whose electrical impedance varies upon exposure to a chemical species;
a substrate supporting and electrically isolating the fibers; and
a set of electrodes disposed on the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured.
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Accused Products
Abstract
A chemical sensor and a system and method for sensing a chemical species. The chemical sensor includes a plurality of nanofibers whose electrical impedance varies upon exposure to the chemical species, a substrate supporting and electrically isolating the fibers, and a set of electrodes connected to the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured. The system includes the chemical sensor, an impedance measuring device coupled to the electrodes and configured to determine an electrical impedance of the plurality of fibers, and an analyzer configured to identify the chemical species based on a change in the electrical impedance. The method measures at least one change in an electrical impedance between spatially separated electrodes connected to a plurality of fibers upon exposure of the fibers to the chemical species, and identifies the chemical species based on the measured change in the electrical impedance.
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Citations
57 Claims
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1. A chemical sensor comprising:
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a plurality of fibers whose electrical impedance varies upon exposure to a chemical species; a substrate supporting and electrically isolating the fibers; and a set of electrodes disposed on the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 41, 42, 43, 44, 45, 46, 47, 48, 50)
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17. A system for sensing a chemical species, comprising:
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a chemical sensor including, a plurality of fibers having a electrical impedance which varies upon exposure to the chemical species, a substrate supporting and electrically isolating the fibers, and a set of electrodes disposed on the plurality of fibers at spatially separated points on the fibers; an impedance measuring device coupled to the electrodes and configured to determine an electrical impedance of the plurality of fibers, and an analyzer configured to identify the chemical species based on a change in the electrical impedance. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 51)
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32. A method for sensing a chemical species, comprising:
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providing a chemical sensor disposed on a gas or liquid permeable substrate; exposing the chemical sensor disposed on the gas or liquid permeable substrate to the chemical species in a gaseous or liquid environment; measuring at least one change in an electrical impedance between spatially separated electrodes disposed on a plurality of fibers of the chemical sensor upon exposure of the fibers to the chemical species; and identifying the chemical species based on the measured change in the electrical impedance of the plurality of fibers. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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49. A system for sensing a chemical species,
a chemical sensor including, a plurality of fibers having an electrical impedance which varies upon exposure to a chemical species, a substrate supporting and electrically isolating the fibers, a set of electrodes connected to the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured, and said fibers having an electrical impedance which changes due to a change in electrical conduction by a chemical reaction of the chemical species with a material of the fiber; - and
a source of the chemical species which chemically reacts with the material of the fiber to chemically alter the bonds of the material of the fiber after exposure to the chemical species.
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52. A chemical sensor comprising:
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a plurality of fibers whose electrical impedance varies upon exposure to a chemical species; a flexible, gas or liquid permeable substrate supporting and electrically isolating the fibers; and a set of electrodes in electrical contact with the plurality of fibers at spatially separated points to permit the electrical impedance of the plurality of fibers to be measured, wherein the electrodes are disposed on the plurality of fibers. - View Dependent Claims (53, 54, 55, 56, 57)
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Specification