Wireless, battery-free, and real-time monitoring of water permeation across thin-film encapsulation

Massimo Mariello (), James Daniel Rosenthal, Francesco Cecchetti, Mingxiang Gao, Anja K. Skrivervik, Yves Leterrier and Stéphanie P. Lacour
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Massimo Mariello: École Polytechnique Fédérale de Lausanne
James Daniel Rosenthal: École Polytechnique Fédérale de Lausanne
Francesco Cecchetti: École Polytechnique Fédérale de Lausanne (EPFL)
Mingxiang Gao: École Polytechnique Fédérale de Lausanne (EPFL)
Anja K. Skrivervik: École Polytechnique Fédérale de Lausanne (EPFL)
Yves Leterrier: École Polytechnique Fédérale de Lausanne (EPFL)
Stéphanie P. Lacour: École Polytechnique Fédérale de Lausanne

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Long-term bioelectronic implants require stable, hermetic encapsulation. Water and ion ingress are challenging to quantify, especially in miniaturized microsystems and over time. We propose a wireless and battery-free flexible platform leveraging backscatter communication and magnesium (Mg)-based microsensors. Water permeation through the encapsulation induces corrosion of the Mg resistive sensor thereby shifting the oscillation frequency of the sensing circuit. Experimental in vitro and in-tissue characterization provides information on the operation of the platform and demonstrates the robustness and accuracy of this promising method, revealing its significance for in-situ real-time monitoring of implanted bioelectronics.

Date: 2024
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DOI: 10.1038/s41467-024-51247-3

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