(133b) In Situ laser-Induced Graphene Materials on Lignocellulosic Films for on-Chip Sensors

This study reports a green and innovative strategy that employs deep eutectic solvents (DESs) to fully convert lignocellulosic biomass into mechanically robust film followed by direct laser writing to induce high-quality laser induced graphene (LIG) for on-chip sensing applications. The effects of various factors, including lignin-containing cellulose content, DES constitutes, and laser parameters, on the formation of high-quality LIG are investigated. Highly conductive LIG with few defects is directly induced on the surface of lignocellulosic film. The in situ LIG-embedded film is fabricated into on-chip sensors. The sensing applications show high sensitivity in detecting heavy metals (e.g., Pb (II)) and pathogens (e.g., Salmonella typhimurium).