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Sensitivity-Selectivity Trade-Offs in Surface Ionization Gas Detection.

Gerhard Müller1, J Daniel Prades2,3, Angelika Hackner4

  • 1Department of Applied Sciences and Mechatronics, Munich University of Applied Sciences, D-80335 Munich, Germany. mueller.g.u.s.grafing@t-online.de.

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|December 20, 2018
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Summary
This summary is machine-generated.

Surface ionization (SI) sensors offer sensitive detection of hazardous materials. However, micro-electro-mechanical-systems (MEMS) and nanowire (NEMS) SI sensors show reduced selectivity due to physical ionization in high-field regions.

Keywords:
corona dischargegas detectionsecondary electron emissionselectivitysensitivitysurface ionization

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Surface ionization (SI) is a sensitive and selective detection method for high-proton affinity substances.
  • SI sensor performance depends on emitter materials and electrode configuration.
  • Existing SI sensor designs present a trade-off between sensitivity and selectivity.

Purpose of the Study:

  • To investigate the factors influencing sensitivity and selectivity in Surface Ionization (SI) sensors.
  • To explain the observed trade-offs in micro-electro-mechanical-systems (MEMS) and nanowire (NEMS) SI sensors.
  • To elucidate the role of electrode geometry in SI sensor performance.

Main Methods:

  • Comparative analysis of different Surface Ionization (SI) sensor configurations.
  • Evaluation of emitter material properties (stoichiometry, nanomorphology).
  • Assessment of electrode configurations, including parallel-plate, MEMS, and NEMS designs.

Main Results:

  • Parallel-plate SI sensors demonstrate high amine-selectivity with various emitter materials.
  • MEMS and NEMS SI sensors exhibit enhanced sensitivity but reduced chemical selectivity.
  • Sensitivity-selectivity trade-offs are attributed to unselective physical ionization in high-field regions of MEMS/NEMS electrodes.

Conclusions:

  • Electrode configuration significantly impacts SI sensor sensitivity and selectivity.
  • Sharp electrode curvatures in MEMS/NEMS sensors can lead to unselective ionization, compromising selectivity.
  • Optimizing electrode design is crucial for balancing sensitivity and selectivity in advanced SI sensors.