ScholarWorks@중앙대학교

초록

Flexible proximity sensors have recently attracted significant interest for their ability to detect environmental stimuli without direct contact. While various sensing mechanisms have driven advancements in proximity sensors, each mechanism presents inherent limitations. In this study, we present an integrated proximity sensor that combines a capacitive sensor for stable measurement with a humidity-based sensor for self-powered operation. The capacitive sensor was fabricated in a sandwich configuration using laser-induced graphene (LIG) patterned on polyimide film. This sensor exhibited superior measurement performance and stability compared to the humidity-based proximity sensor. Conversely, the humidity sensor was developed by dip-coating cellulose paper with an aqueous solution of reduced graphene oxide (rGO) and silk sericin. To enable self-powered operation, a GO-based energy module was engineered using a moisture-electric annealing (MeA) process, providing electrical power to the humidity sensor. The simple electrical output of the humidity sensor facilitated direct connection to the self-powered module, thereby imparting self-powered functionality. The synergistic integration of the capacitive and humidity sensors significantly improved overall performance, offering both high measurement stability and self-powered functionality. This integrated sensor design holds strong promise for applications in flexible electronics, non-contact sensing systems, and energy-harvesting devices.

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