We demonstrate here the successful operation of an ionization gas sensor with a gap spacingSof 2 or7± 0.4 using carbon nanotubes as the electrode material. The device is chip based and fabricated using a microelectromechanical system process. Application of a bias of 0.6–1.8 V(S≈2\ )or 12–15 V(S≈7\ )to the electrodes generates an electric field that is sufficient to field ionize He,CO₂, and their mixtures in air with high sensitivity and selectivity. The approach is considered as effective for lowering the operation voltage of ionization gas sensors below 36 V (safety voltage criterion) and is significant for the development of the smart device in this field.
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Hou et al. (2007) studied this question.
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