Selective detection of toxic amines by combined resistive/surface ionization gas detectors

Carola Oberhüttinger, Angelika Hackner, Thomas Ziemann, Gerhard Müller

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

Heated metal oxide (MOX) layers exhibit two different kinds of gas response: a resistive (R) and a surface ionization (SI) response; For one and the same analyte gas the R and SI responses exhibit different surface temperature dependences; The temperature dependences of the R and SI responses are analyte-specific; At high surface temperature a wide range of hydrocarbon species gives rise to both an R and a SI response; In the range of normal operation temperatures of MOX gas sensors (400-500°C) the R response exhibits broad-range sensitivity to all kinds of combustible hydrocarbons whereas the SI response is limited to hydrocarbons with amine functional groups; A concept for a bi-functional sensor with a combined R and SI readout from a single MOX gas sensing layer has been presented. Due to the distinctly different cross sensitivity profiles of the R and SI responses, a combined R/SI detector allows low concentrations of amines to be detected in front of large backgrounds of combustible hydrocarbons; Potential applications of R/SI detectors are detectors for food freshness and illicit drugs.

Original languageEnglish
StatePublished - 2010
Externally publishedYes
EventSystems Integration 2010 - 4th European Conference and Exhibition on Integration Issues of Miniaturized Systems - MEMS, MOEMS, ICs and Electronic Components - Como, Italy
Duration: 23 Mar 201024 Mar 2010

Conference

ConferenceSystems Integration 2010 - 4th European Conference and Exhibition on Integration Issues of Miniaturized Systems - MEMS, MOEMS, ICs and Electronic Components
Country/TerritoryItaly
CityComo
Period23/03/1024/03/10

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