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Flexible strain sensors are an important component for future intelligentrobotics. However, the majority of current strain sensors must be electricallyconnected to a corresponding monitoring system via conducting wires, whichincreases system complexity and restricts the working environment for monitoring strains. Here, stretchable graphene–polymer nanocomposites that act asstrain sensors using a Joule heating effect are reported. When the resistance ofthe sensor changes in response to a strain, the resulting change in temperatureis wirelessly detected in an intelligent robot. By engineering and optimizing thesurface structure of graphene–polymer nanocomposites, the fabricated strainsensors exhibit excellent stability when subjected to periodic temperature signals over 400 cycles while being periodically strained and deliver a high strainsensitivity of 7.03×10∑�/span>4°C∑�/span>1%∑�/span>1for strain levels of 0% to 30%. As a wearableelectronic device, the approach provides the capability to wirelessly monitorsmall strains for intelligent robots at a high strain resolution of≇�/span>0.1%. Moreover, when the strain sensing system operates as a multichannel structure, itallows precise strain detection simultaneously, or in sequence, for each fingerof an intelligent robot.