Highly Sensitive, Oxidation-Resistant, and Biodegradable Capacitive Pressure Sensor with Origami/Kirigami Design for Wearable Electronics
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The use of nonbiodegradable synthetic polymers in wearable electronics and biomedical sensors leads to significant waste and toxic by-products. To mitigate this, researchers are using biodegradable biopolymers, though these often have poor conductivity, sensitivity, and stability. We developed a biodegradable pressure sensor using cellulose paper coated with silver nanowires (AgNWs), Ti3C2Tx MXene, and reduced graphene oxide (rGO). This sensor shows high sensitivity (1.031 kPa−1) across a 0–40 kPa range and excellent durability (5000 cycles). The addition of rGO nanosheets enhances resistance to oxidation. Various designs, such as origami butterfly and kirigami snowflake sensors, demonstrate its versatility and potential for physiological sensing applications in biodegradable wearable technology.