Preprint Brief Report Version 1 Preserved in Portico This version is not peer-reviewed

Characterization of Inkjet-printed Digital Microfluidics Devices

Version 1 : Received: 7 March 2021 / Approved: 9 March 2021 / Online: 9 March 2021 (09:30:33 CET)

How to cite: Chen, S.; He, Z.; Choi, S.; Novosselov, I. Characterization of Inkjet-printed Digital Microfluidics Devices. Preprints 2021, 2021030246 (doi: 10.20944/preprints202103.0246.v1). Chen, S.; He, Z.; Choi, S.; Novosselov, I. Characterization of Inkjet-printed Digital Microfluidics Devices. Preprints 2021, 2021030246 (doi: 10.20944/preprints202103.0246.v1).

Abstract

Digital microfluidics (DMF) devices enable precise manipulation of small liquid volumes in point-of-care testing. Printed circuit board (PCB) substrate is commonly utilized to build DMF devices. However, inkjet printing can be used to fabricate DMF circuits, providing a less expensive alternative to PCB-based DMF designs while enabling more rapid design iteration cycles. We demonstrate the fabrication process of the inkjet-printed DMF circuit. We compare Kapton and polymethyl methacrylate (PMMA) as dielectric coatings by measuring the minimal droplet actuation voltage for a range of actuation frequencies. The minimum actuation voltage of 5.6 V was required for droplet movement with the PMMA layer thickness of 0.2 μm and a hydrophobic layer of 0.17 μm. Significant issues with PMMA dielectric breakdown were observed at actuation voltages above 10 V. In comparison, devices that utilized Kapton were found to be more robust even at the actuation voltage up to 100 V.

Subject Areas

Digital microfluidics; PMMA; Kapton; Ag ink; Silver nanoparticles; Inkjet printed electrodes

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