Transient magnesium‐based thin‐film temperature sensor on a flexible, bioabsorbable substrate for future medical applications

Applied Research, vol. 3

Abstract

Abstract In this work, the bioabsorbable materials, namely fibroin, polylactide acid (PLA), magnesium, and magnesium oxide are investigated for their application as transient, resistive temperature detectors (RTD). For this purpose, a thin‐film magnesium‐based meander‐like electrode is deposited onto a flexible, bioabsorbable substrate (fibroin or PLA) and encapsulated (passivated) by additional magnesium oxide layers on top and below the magnesium‐based electrode. The morphology of different layered RTDs is analyzed by scanning electron microscopy. The sensor performance and lifetime of the RTD is characterized both under ambient atmospheric conditions between 30°C and 43°C, and wet tissue‐like conditions with a constant temperature regime of 37°C. The latter triggers the degradation process of the magnesium‐based layers. The 3‐layers RTDs on a PLA substrate could achieve a lifetime of 8.5 h. These sensors also show the best sensor performance under ambient atmospheric conditions with a mean sensitivity of 0.48 Ω/°C ± 0.01 Ω/°C.

Authors 6

1. Kevin A. Janus Aachen Institute of Nano- and Biotechnologies (INB)

   Philipps University of Marburg · FH Aachen

   Affiliation as printed

   Institute for Pharmaceutical Chemistry Philips University of Marburg Marburg Germany

   Institute of Nano‐ and Biotechnologies (INB), FH Aachen Jülich Germany

   Institute for Pharmaceutical Chemistry, Philips University of Marburg, Marburg, 35032 Germany

2. Stefan Achtsnicht Aachen Institute of Nano- and Biotechnologies (INB)

   FH Aachen

   Affiliation as printed

   Institute of Nano‐ and Biotechnologies (INB), FH Aachen Jülich Germany

3. Aleksander Drinic
   Affiliation as printed

   Fibrothelium GmbH Aachen Germany

   Fibrothelium GmbH, Aachen, 52068 Germany

4. Alexander Kopp
   Affiliation as printed

   Fibrothelium GmbH Aachen Germany

   Fibrothelium GmbH, Aachen, 52068 Germany

5. Michael Keusgen

   Philipps University of Marburg

   Affiliation as printed

   Institute for Pharmaceutical Chemistry Philips University of Marburg Marburg Germany

   Institute for Pharmaceutical Chemistry, Philips University of Marburg, Marburg, 35032 Germany

6. Michael Josef Schöning corresponding Aachen Institute of Nano- and Biotechnologies (INB)

   Forschungszentrum Jülich · FH Aachen

   Affiliation as printed

   Institute of Biological Information Processing (IBI‐3), Forschungszentrum Jülich GmbH Jülich Germany

   Institute of Nano‐ and Biotechnologies (INB), FH Aachen Jülich Germany