GAS SENSOR AND METHOD FOR PRODUCING THE SAME

• US 20130111974A1
• Filed: 07/07/2011
• Published: 05/09/2013
• Est. Priority Date: 07/13/2010
• Status: Active Grant

• Current Assignee: Eberhard Karls Universität Tübingen, universitat bremen, Universitã¤T Bremen
• Original Assignee: Eberhard Karls Universität Tübingen, Universitã¤T Bremen
• Inventors: Barsan, Nicolae, Kemmler, Jens, Maedler, Lutz, Weimar, Udo, Pokhrel, Suman
• Granted Patent: US 9,091,669 B2
• Time in Patent Office: Days
• US Class Current: 73/23.2
• CPC Class Codes: G01N 27/125 Composition of the body, e.g. the composition of its sensitive layer
• CPC Class Codes: G01N 27/127 comprising nanoparticles
• CPC Class Codes: G01N 33/0009 General constructional details of gas analysers, e.g. portable test equipment G01N1/22 takes precedence
• CPC Class Codes: G01N 33/0047 for organic compounds

Abstract

The invention relates to a gas sensor for detecting gas in the air, especially formaldehyde. The sensor comprises at least one gas-sensitive zone which is preferably a layer on a substrate and which contains the ternary compound In₄Sn₃O₁₂ as the gas-sensitive material. In order to produce the gas-sensitive zone, a flame spray pyrolysis (FSP) is carried out, organometallic compounds of indium and tin being used as the reactants. The gas sensor is especially suitable for online gas detection.

Claims

1. A sensor for detecting gases, comprising at least one gas-sensitive zone applied on a substrate, characterized in that the gas-sensitive zone contains the ternary compound In₄Sn₃O₁₂.

2. The sensor according to claim 1, characterized in that the at least one gas-sensitive zone is in the form of a layer.

3. The sensor according to claim 1, characterized in that the at least one gas-sensitive zone is applied using a flame pray pyrolysis method (FSP).

4. A method for producing a sensor according to claim 1, wherein the production of the gas-sensitive zone is effected by means of a flame spray pyrolysis (FSP).

5. The method according to claim 4, characterized in that organometallic compounds of indium and tin, dissolved in an organic solvent, are used as source materials.

6. The method according to claim 4, characterized in that the source materials are indium acetylacetone or tin-2-ethylhexanoate.

7. The method according to claim 6, characterized in that the source materials indium acetylacetone or tin-2-ethylhexanoate are in each case used in the same concentrations between 0.05 and 0.7 mol.

8. Use of the sensor according to claim 1 for online gas detection.

9. Use of the sensor according to claim 1 for detecting formaldehyde

10. Use of the sensor according to claim 1 for detecting gas in the home environment or in business establishments.