Rapid and Selective Detection of Linalool Using Solidly Mounted Resonators for Plant Health Monitoring

This work presents the first demonstration of
linalool detection using solidly mounted resonators (SMRs)
functionalized with ethyl cellulose (EC). A dual-sensor platform was developed, comprising a CMOS-compatible SMR
and a commercial SMR, housed within a 3-D-printed sensing
chamber, and a commercial temperature sensor for real-time
temperature compensation. Both SMR sensors exhibited
concentration-dependent responses consistent with the Freundlich isotherm model. The commercial SMR achieved a
sensitivity of 15 kHz/ppm with a response time of 228 s, whilst
the custom SMR showed a lower sensitivity of 1.03 kHz/ppm
but a faster response time of 45 s. Both SMR devices
exhibited strong selectivity toward linalool over other volatile
organic compounds (VOCs), such as d-limonene, trans-2-
hexenal, and ethanol. These results highlight the potential of low-power SMR-based platforms for low-cost, real-time,
noninvasive monitoring of plant health and broader VOC sensing applications.