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Gas diffusion and evaporation control using EWOD actuation of ionic liquid microdroplets for gas sensing applications
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0001-9552-4234
2018 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 267, p. 647-654Article in journal (Refereed) Published
Abstract [en]

The lifetime of electrochemical gas sensors suffers from electrolyte evaporation and from the impracticality to perform recalibration. To tackle these issues, a prototype of a microfabricated gas diffusion controlling system, based on coplanar electrowetting-on-dielectric (EWOD) actuation of ionic liquid microdroplets, is presented. The system is designed to be integrated with electrochemical gas sensors to allow on-demand sealing of the sensing chamber from the environment. The MEMS device can be electrically toggled between an open and a closed state, in which the microdroplets are used to cover or uncover the openings of a perforated membrane connecting to the sensing compartment, respectively. This ON/OFF diffusion-blocking valve mechanism potentially allows for recalibration and for liquid electrolyte evaporation reduction when the sensor is not in use, thus extending the gas sensor lifetime. A one order of magnitude reduction of evaporation rate and a more than three orders of magnitude reduction of gas diffusion time were experimentally demonstrated. Ionic liquid movement can be performed with an applied AC voltage as low as 18 V, using super-hydrophobic cover plates to facilitate droplet motion. Furthermore, the shown ionic liquid micro-droplet manipulation provides a robust and low voltage platform for digital microfluidics, readily adaptable to serve different applications.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 267, p. 647-654
Keywords [en]
Contact angle modulation, Electrochemical gas sensing, Electrowetting on dielectric, Gas diffusion valve, Ionic liquids, MEMS actuator
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-229250DOI: 10.1016/j.snb.2018.04.076ISI: 000432775600076Scopus ID: 2-s2.0-85046339371OAI: oai:DiVA.org:kth-229250DiVA, id: diva2:1212133
Funder
EU, European Research Council, 267528Swedish Research Council
Note

QC 20180601

Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-08-20Bibliographically approved

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Roxhed, NiclasStemme, Göran

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