Liquid Metal-Based\nAngle Detection Sensor

Abstract

Liquid metal (LM) as the universal artificial biomimetic\nsensory\nmaterial has attracted much interest in academic and industrial applications,\nsuch as soft robots, flexible electronics, and micro–nano devices.\nIt remains a pivotal challenge to develop a stable and highly sensitive\nangle detection with a rapid response. Herein, we present an LM-based\nangle detection sensor. Ga-based LM is gradually injected into hollow\nfibers with rough internal structures, resulting in a gradient of\nLM content inside the fibers due to the synergistic effect of pressure\ndrop and the fast formation of an oxide film on its surface. The LM\nis affected by the gravity pressure when the fiber is tilted, and\nthe Laplace pressure on the surface of the LM continuously reaches\nan equilibrium state to induce the continuous deformation of the LM.\nThe proposed sensor with highly sensitive to the tilt angle and showcases\na linear relation with the tilt angle. For its advantages, this work\nshows a great potential application in sensor fields and opens routes\nfor the application of electronic whiskers.