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Open Access Publications from the University of California

Elimination of Response to Relative Humidity Changes in Chemical-Sensitive Field-Effect Transistors.

  • Author(s): Gupta, Niharika;
  • Fahad, Hossain M;
  • Amani, Matin;
  • Song, Xiaohui;
  • Scott, Mary;
  • Javey, Ali
  • et al.

Detecting accurate concentrations of gas in environments with dynamically changing relative humidity conditions has been a challenge in gas sensing technology. We report a method to eliminate effects of humidity response in chemical-sensitive field-effect transistors using microheaters. Using a hydrogen gas sensor with Pt/FOTS active material as a test case, we demonstrate that a sensor response of 3844% to a relative humidity change of 50 to 90% at 25 °C can be reduced to a negligible response of 11.6% by utilizing microheaters. We also show the advantage of this technique in maintaining the same sensitivity in changing ambient temperatures and its application to the nitrogen dioxide gas sensors.

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