Methane is an important but dangerous industrial gas.
Compared with existing methane gas sensors, Surface Acoustic Wave (SAW) sensor
exhibits many unique advantages like smaller size, fast response and room
temperature operation. Thanks to the good affinity to methane molecules, the
Cryptophane-A (CrypA) was chosen as the sensitive interface coated onto the SAW
device surface for methane sensing operating at room temperature.
Moreover, a 300MHz two-port SAW resonator with low insertion
loss (~3dB) and high quality factor (~2500) were developed, and acted as the
feedback element of a differential oscillation structure. To improve the methane sensor performance, the CrypA coating method was optimized, that is, an gas
experiment was conducted, in which, CrypA was deposited on the sensing SAW
resonators via drop-coating and spin-coating, respectively.
The experimental results indicated that drop-coating method
achieved much larger response (~1 kHz) over the spin-coating (~200Hz) because
of the larger roughness. Satisfactory sensitivity and detection limit were
observed in the gas experiments.
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