Fig. 2: Eco-friendly recycling and biodegradability of the printed Fe/Fe3O4-NaCMC MR sensors.
From: Eco-sustainable magnetoresistive sensors towards disposable magnetoelectronics
a Photographs of printed Fe/Fe3O4-NaCMC sensors on NaCMC and paper substrates with Mo contacts, demonstrating dissolution in water at room temperature. Photographs in dashed block showing the separation and recovery of dispersed Fe/Fe₃O₄ microparticles using a permanent magnet. Scale bar, 3 cm. b Photographs showing printed Fe/Fe3O4-NaCMC sensors with different biodegradable encapsulation materials immersed in water. Scale bar, 1 cm. c MR performance degradation of printed Fe/Fe3O4-NaCMC sensors with different biodegradable encapsulation materials during water immersion at room temperature. d, Magnetoresistance and sensitivity of printed Fe/Fe3O4 sensors with different binders: alginate, egg white, and starch. e Magnetoresistance and sensitivity of printed Fe/Fe3O4-NaCMC sensors on different biological objects substrates (leaf, tomato, and daisy petal). The bottom photographs show the comparison after washing off the printed sensors placed on the different biological objects substrates. Scale bar, 2 cm.
