This work describes the development of an indoor air quality monitor based on high frequency solidly mounted resonators (SMR) for the detection of volatile organic compounds (V OC). The sensor system operates in a differential mode with two SMR devices driven by Pierce oscillators. The active resonator was spray-coated with a selective polymer compound, while the second one was used as a reference. The absorption of vapor molecules into the polymer layer causes a frequency shift in the resonator. A study of suitable polymer coatings and finite element simulations on the sensor response were performed. Experimental results demonstrated that the VOC monitor is capable of detecting toluene concentrations down to 5 ppm with a high sensitivity of 60 Hz/ppm for a 180 nm PDMS polymer coated SMR resonating at 900 MHz. We believe that the system could be used as a robust, low-cost and low power microsensor for the real-time and ubiquitous monitoring of VOCs, particularly in a personal air quality monitor.
|Title of host publication||2017 IEEE SENSORS|
|Number of pages||3|
|Publication status||Published - Dec 2017|
|Event||IEEE Sensors Conference - UK, Glasgow, United Kingdom|
Duration: 29 Oct 2017 → 1 Nov 2017
|Conference||IEEE Sensors Conference|
|Period||29/10/17 → 1/11/17|
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- Polymer films
- Air quality