VOC sensing using batch-fabricated temperature compensated self-leveling microstructures

SENSORS AND ACTUATORS B-CHEMICAL

卷:311

Article

Likhite, Rugved¹  Banerjee, Aishwaryadev¹  Majumder, Apratim¹  Karkhanis, Mohit¹  Kim, Hanseup¹  Mastrangelo, Carlos H.¹ 

[1] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA

关键词: Capacitive sensors;    Polymer swelling;    Self-leveling;    Volatile organic compounds;   

DOI  :  10.1016/j.snb.2020.127817

来源: Elsevier

【 摘 要 】

We present the design, fabrication, and response of a low-power, polymer-based VOC sensor based on the selfleveling of mechanically leveraged structures. The device utilizes folded polymer-coated microcantilevers to achieve passive temperature compensation without the need for additional compensating sensors or electronics. We demonstrate that a self-leveling vapor sensor provides the same gas response as a simple microcantilever geometry, showing similar to 20 % change in device capacitance when subjected to 35-85 %RH change while showing nearly-zero baseline drift due to changes in ambient temperature when the temperature is increased from 23-72 degrees C which is similar to 52-fold better than a simple microcantilever geometry. The response of the VOC sensor was measured using three polymers (Polyimide, Polyurethane, and PDMS) against five different analytes (Ethanol, Acetone, Benzene, Hexane, and Water) and an SVM-based model was used to show target specificity. The sensor also showed an absorption response time (t90) of similar to 138 s. We propose that the self-leveling vapor sensor geometry is a significant improvement to a simple microcantilever vapor sensor as it offers the same performance but shows near-complete elimination of temperature-induced baseline drift.

【 授权许可】

Free