Scalable Self-Powered Sensor Based on Triboelectric Nanogenerators with Surface-Modulated Electronegativity for Harsh Environments.

The growing need for self-powered sensors in extreme environments, such as biomedical implants, industrial monitoring, and deep-sea exploration, has driven interest in triboelectric nanogenerators (TENGs) as efficient energy harvesters. However, the challenge lies in developing a scalable, cost-effective fabrication process that maintains stable performance in water and across a range of varying temperatures. This study presents a surface modification strategy that enables precise modulation of electronegativity through a scalable and straightforward immersion process. Unlike conventional methods that rely on nanostructuring to enhance triboelectric activity, our approach utilizes surface functionalization to chemically anchor elements with varying electronegativities onto the substrate. These strong chemical bonds effectively modify the substrate's electronegativity, thereby enhancing the TENG's electrical output on both sides. The process is scalable beyond A4 size, making it well-suited for roll-to-roll manufacturing. By functionalizing polydimethylsiloxane (PDMS) electrodes with fluorine (-F) and amino (-NH