A new preparation method for sputtered MoO3 multilayers for the application in gas sensors

Cuk Imawan, H. Steffes, F. Solzbacher, E. Obermeier

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

A new method for the preparation of sputtered MoO3 multilayer thin films for the application in gas sensors has been developed. A remarkable change of the crystallinity and the microstructure compared to the whisker-like structure of conventionally sputtered MoO3 single-layer films is found. The multilayer films have a dense and a smooth structure with a small crystallite size. This preparation method evidences that the H2 sensing properties, such as sensitivity, selectivity, response time and long-term stability of the sensors can be improved. The cross-sensitivity towards NO2, NH3, CO, CH4, and SO2 is low. The response time (τ50) to H2 can be drastically reduced from 40s for the single-layer film to 10 s. The sensor exposes a very high response to H2 with a good signal linearity for high concentrations ranging from 2000 to 9000 ppm.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume78
Issue number1-3
DOIs
Publication statusPublished - 30 Aug 2001

Keywords

  • H gas sensors
  • MoO multilayer
  • Sputtering

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