▎ 摘　　要

Graphene based polymer nanocomposites are widely used in flexible electronics and in sensing technology. However, ecofriendly materials with utmost performances are still under investigation. Here we report a simple, flexible, partially transparent and efficient temperature sensor fabricated from composite film of reduced graphene oxide (rGO) and cellulose. The rGO nanosheets are obtained by partial reduction of graphene oxide through low-temperature multi-step annealing. The relative capacitance of the sensor changes as a function of temperature for all thermally reduced rGO filled composites. Upon temperature stimulation, charges form at the rGO-cellulose interface. This mechanism allows the composite films to act as high performance capacitive sensors capable of detecting temperature variations. The functional properties of the reusable, ecofriendly and inexpensive rGO-cellulose device, allow for potential temperature sensor application, which is one among the best ever reported. (C) 2015 Elsevier B.V. All rights reserved.