▎ 摘　　要

An electromechanical response of the chemically reduced graphene oxide (rGO) fiber is reported. The rGO fiber has a tensile strength of 159 MPa, and an electrical conductivity of 170 S/cm. When a current is applied, an immediate load-drop, up to 82% of the original loading, can be observed. Such a load-drop is partially reversible when the current is withdrawn. Higher current density (5-20 mA) and higher relative humidity (40%-80%) result in larger load changes. Joule heating induced dynamic absorption and desorption of water molecules, which further induce the rGO sheet sliding and elastic deformation are responsible for this actuation. (C) 2016 Elsevier Ltd. All rights reserved.