Stretchable, Transparent, and Self‐Patterned Hydrogel‐Based Pressure Sensor for Human Motions Detection

TLDR

The study aims to develop a stretchable, transparent, self‑patterned conductive hydrogel pressure sensor for detecting human motions. The authors fabricate a binary networked conductive hydrogel from acrylamide and polyvinyl alcohol and use it to construct an ultrastretchable, biocompatible, transparent pressure sensor. The sensor shows >500 % stretchability, >90 % transparency, 0.05 kPa⁻¹ sensitivity, 150 ms response, 500‑cycle durability, and can detect both subtle (phonation, airflow, swallowing) and robust (finger, limb) motions.

Abstract

Abstract In this study, a binary networked conductive hydrogel is prepared using acrylamide and polyvinyl alcohol. Based on the obtained hydrogel, an ultrastretchable pressure sensor with biocompatibility and transparency is fabricated cost effectively. The hydrogel exhibits impressive stretchability (>500%) and superior transparency (>90%). Furthermore, the self‐patterned microarchitecture on the hydrogel surface is beneficial to achieve high sensitivity (0.05 kPa −1 for 0–3.27 kPa). The hydrogel‐based pressure sensor can precisely monitor dynamic pressures (3.33, 5.02, and 6.67 kPa) with frequency‐dependent behavior. It also shows fast response (150 ms), durable stability (500 dynamic cycles), and negligible current variation (6%). Moreover, the sensor can instantly detect both tiny (phonation, airflowing, and saliva swallowing) and robust (finger and limb motions) physiological activities. This work presents insights into preparing multifunctional hydrogels for mechanosensory electronics.