Microfabricated Bioresorbable Flexible Passive Sensor Nodes for Strain Monitoring

This talk introduces a batch-compatible photolithography-based microfabrication approach for creating highly miniaturized biodegradable sensors on flexible substrates. Up to 1600 devices can fit within a 1 cm^2 footprint. A capacitive strain sensor on a poly(glycerol sebacate) (PGS) substrate, crucial for implantable and wearable applications, demonstrates the method. The sensor measures changes in the gap between interdigitated electrodes (IDEs), showing stable capacitance under various strains (5%, 10%, 15%). Wireless operation and rapid degradation in PBS (1 M, pH ≈ 12) are confirmed. This scalable process offers versatile, high-density biodegradable sensors for real-world applications.