27 September 2016 Low-cost scalable quartz crystal microbalance array for environmental sensing
Author Affiliations +
Proliferation of environmental sensors for internet of things (IoT) applications has increased the need for low-cost platforms capable of accommodating multiple sensors. Quartz crystal microbalance (QCM) crystals coated with nanometer-thin sensor films are suitable for use in high-resolution (~1 ng) selective gas sensor applications. We demonstrate a scalable array for measuring frequency response of six QCM sensors controlled by low-cost Arduino microcontrollers and a USB multiplexer. Gas pulses and data acquisition were controlled by a LabVIEW user interface. We test the sensor array by measuring the frequency shift of crystals coated with different compositions of polymer composites based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) while films are exposed to water vapor and oxygen inside a controlled environmental chamber. Our sensor array exhibits comparable performance to that of a commercial QCM system, while enabling high-throughput 6 QCM testing for under $1,000. We use deep neural network structures to process sensor response and demonstrate that the QCM array is suitable for gas sensing, environmental monitoring, and electronic-nose applications.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric S. Muckley, Eric S. Muckley, Cristain Anazagasty, Cristain Anazagasty, Christopher B. Jacobs, Christopher B. Jacobs, Tibor Hianik, Tibor Hianik, Ilia N. Ivanov, Ilia N. Ivanov, "Low-cost scalable quartz crystal microbalance array for environmental sensing", Proc. SPIE 9944, Organic Sensors and Bioelectronics IX, 99440Y (27 September 2016); doi: 10.1117/12.2237942; https://doi.org/10.1117/12.2237942


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