# US 8,739,604 B2 · Gas sensor and method of making

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- Number: US 8,739,604 B2
- Document ID: US8739604B2
- Status: Granted
- Kind: B2
- Application number: 11/960,781
- Filed: 2007-12-20
- Published: 2009-06-25
- Granted: 2014-06-03
- Earliest claimed: 2007-12-20
- Assignees: Amphenol Thermometrics, Inc.
- Applicants: Kalaga Murali Krishna; Geetha Karavoor; John Patrick Lemmon; Jun Cui; Vinayak Tilak; Mohandas Nayak; Ravikumar Hanumantha
- Inventors: Kalaga Murali Krishna; Geetha Karavoor; John Patrick Lemmon; Jun Cui; Vinayak Tilak; Mohandas Nayak; Ravikumar Hanumantha
- Web page: https://patentgrep.com/patent/US8739604B2

## CPC

- G01N 27/4162: {investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid (conductometry in general G01N27/06; amperometric gas sensors G01N27/404)}
- G01N 27/125: {Composition of the body, e.g. the composition of its sensitive layer}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A gas sensor is disclosed. The gas sensor includes a gas sensing layer, at least one electrode, an adhesion layer, and a response modification layer adjacent to said gas sensing layer and said layer of adhesion. A system having an exhaust system and a gas sensor is also disclosed. A method of fabricating the gas sensor is also disclosed.

## Claims

### Claim 1

A gas sensor comprising:
a gas sensing layer comprising at least one metal oxide compound and at least two dopant species, the said gas sensing layer being capable of detecting at least one analyte selected from the list comprising NO, NO2, NH3, H2O, and combinations thereof, in harsh environments;
at least one electrode in communication with the said gas sensing layer;
an adhesion layer, comprising a chemical element selected from the group consisting of Ti, Cr, and combinations thereof; and
a response modification layer, consisting of at least one chemical element selected from the group consisting of Ti, Re, Ni, Ta, Nb, Mo, Zr, and combinations thereof, adjacent to the gas sensing layer and the adhesion layer;
wherein said metal oxide is selected from the list of metal oxides consisting of W, Ta, and Nb; and
wherein said dopant species are selected from the list of chemical elements consisting of Re, Ni, V, Ta, Nb, Mo, and Zr.

### Claim 2 (depends on 1)

The gas sensor of claim 1, wherein the said at least one electrode is positioned within the adhesion layer.