Enhanced signal fidelity in wearable pressure sensors via geometrical confinement of inverted microdome architectures

An inverted conical micro-array is developed via template-assisted strategy to enhance sensing reliability. • Geometrical confinement of recessed structures effectively shields the sensing interface from shear interference. • The sensor achieves a high SNR of 48.43 dB and high-fidelity capture of subtle physiological features. High sensitivity and a broad linear range are often mutually exclusive in resistive pressure sensors. This work reports a geometrical confinement strategy to resolve this trade-off by developing a CNT/graphene-TPU composite sensor featuring an inverted conical micro-array. Unlike conventional convex or planar architectures, the recessed geometry introduces a controlled inward-deformation mechanism, which significantly enhances localized stress concentration and optimizes the regulation of conductive pathways. Crucially, this inverted structure acts as a mechanical shield that suppresses friction-induced micro-slippage and contact-area fluctuations, effectively isolating the sensing interface from external shear perturbations. Consequently, the sensor achieves an exceptional signal-to-noise ratio (SNR) of 48.43 dB, a high sensitivity of 293 kPa −1 , in the low-pressure range of 0–12 kPa, and a wide linear sensing range. The device’s superior signal fidelity is demonstrated through high-precision physiological monitoring and tactile mapping, where it captures subtle pulse features (e.g., diastolic waves) typically masked by noise. This study provides a novel perspective on leveraging recessed micro-architectures to achieve high-performance, interference-immune wearable electronics. Download: Download high-res image (128KB) Download: Download full-size image