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US 2013/0219995 A1Published application
Obtaining selectivity in gas sensors via a sensor array system composed of p and n type material
AssigneeThe Ohio State University
InventorsPrabir Dutta, Suvra Mondal, Solomon Ssenyange
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Abstract
Systems and methods for discriminating among volatile compounds is provided using a semiconductor junction structure or sensor device. Sensor devices of the present disclosure employ a combination of hole carriers (p-type) and electron carriers (n-type) metal oxides deposited, for example, on a gold microspring array designed so that it has several leads that are at different distances from each other.
Claims17
A sensor system comprising:
- sensing element including:
- a p-type MOS material,
- an n-type MOS material discrete from the p-type MOS material and contacting the p-type MOS material at a diffuse p-n junction;
- a plurality of electrode wires, including a first electrode wire connecting spaced electrodes in the p-type MOS material, a second electrode wire connecting spaced electrodes in the n-type MOS material, and a third electrode wire connecting an electrode in the p-type MOS material and an electrode in the n-type MOS material;
- and
- a controller programmed to determine a measured resistance across each of the first-third electrode wires when the sensing element is exposed to a sample gas, estimate a null point from the measured resistances, and identify an analyte in the sample gas based on a statistical comparison of the measured resistances with a stored calibration database.
3 more elements
Dependencies are inferred from the claim text.