To deal with the effects of electronic waste, the use of Polylactic acid (PLA) in green flexible electronics has gotten a lot of interest as a synthetic renewable and biodegradable material. Unfortunately, the development of PLA-based electrical devices is limited by the fact that they can survive three years at sea or in the soil¹. PLA is highly vulnerable to hydrolytic and enzymatic breakdown in the amorphous area because water may easily infiltrate it, when PLA is mixed with other polymer matrices, phase separation occurs, enhancing water absorption. Aside from that, utilizing a bio-based binder made of a blend of Polylactic acid (PLA) and water-borne polyurethane improves the brittleness of PLA, making it suitable for tactile applications^{2, 3}.

The fabricated sensor shows an encouraging electrical conductivity of 1004.1±2.6 S/m. Using hybrid conductive micro and nanofillers cause to lowers the percolation threshold and reduces manufacturing costs while keeping the ink's exceptional electrical characteristics⁴. Moreover, CNTs employed as conductivity fillers could bridge the neighboring silver flakes to accelerate electron transport⁵. The large-scale strain sensors have excellent performance over an extensive working range (up to 40 % strain), and, as expected, the micro-pressure sensor indicates high-pressure sensitivity (0.3kPa^-1) and operation range (0.2-450KPa). Furthermore, the coated ink is biodegradable in marine environments, reducing its accumulation in the ecosystem over time.

1. Wang, J., et al., Biodegradable, flexible, and transparent conducting silver nanowires/polylactide film with high performance for optoelectronic devices. Polymers, 2020. 12(3): p. 604.

2. Pyo, S., et al., Recent Progress in Flexible Tactile Sensors for Human‐Interactive Systems: From Sensors to Advanced Applications. Advanced Materials, 2021: p. 2005902.

3. Lochab, A., et al., Recent advances in carbon based nanomaterials as electrochemical sensor for toxic metal ions in environmental applications. Materials Today: Proceedings, 2021.

4. Ambrosetti, G., et al., Solution of the tunneling-percolation problem in the nanocomposite regime. Physical Review B, 2010. 81(15): p. 155434.

5. Luo, J., et al., Electrically conductive adhesives based on thermoplastic polyurethane filled with silver flakes and carbon nanotubes. Composites science and technology, 2016. 129: p. 191-197.