Indoor air quality monitor based on Solidly Mounted Resonators for the detection of VOCs

Farah-Helúe Villa-López, Marina Cole, Sanju Thomas, Julian W Gardner

    Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

    4 Citations (Scopus)
    56 Downloads (Pure)


    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.
    Original languageEnglish
    Title of host publication2017 IEEE SENSORS
    Number of pages3
    ISBN (Electronic)9781509010127
    Publication statusPublished - Dec 2017
    EventIEEE Sensors Conference - UK, Glasgow, United Kingdom
    Duration: 29 Oct 20171 Nov 2017


    ConferenceIEEE Sensors Conference
    Country/TerritoryUnited Kingdom

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    • Polymers
    • Monitoring
    • Resonators
    • Oscillators
    • Polymer films
    • Sensitivity
    • Air quality


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