A room temperature SAW based methane gas sensors

This work reports a supramolecular cryptophane-A-coated surface acoustic wave (SAW) gas sensor for methane gas detection. Two two-port SAW resonators with low insertion loss, single resonation, and high Q-value was fabricated on a same ST-X quartz substrate, and acted as the feedback element of the oscillators. A Supramolecular cryptophane-A was synthesized from vanillyl alcohol using a double trimerisation method and deposited onto one of SAW resonators via spinning method. The present gas sensor was exposed to various concentrations of CH₄ gas at room temperatures. Larger sensor response and good repeatability were observed in the sensor experiment.