The electrical-triggered high contrast and reversible color-changing Janus fabric based on double side coating.

A sensitive electrothermochromic Janus fabric driven by voltage is demonstrated via a facial double side coating. The graphene forms a conductive layer that allows Joule heating to supply the thermal resource for the electrothermochromic behavior of polyester fabric. The thermochromic dye with reversible color-changing property is coated on the opposite side of the graphene layer. The color of electrothermochromic Janus fabric changes from blue to white with a gradual heating that exceeded 45 oC at the applied voltage of 10 V. The switching rate of color is rapid with the increase of temperature from the room temperature to above 45 oC in 8 s, resulting from the superior resistive heating of the graphene. The electrical conductivity of the electrothermochromic Janus fabric is not disturbed once undergoing a bending angle range from 30 ° to 150 ° and the temperature remains stable after 1000 bending cycles, which clearly indicates the excellent flexibility of the fabric. The steady signal in the heating/cooling curve is observed after 500 cycles, pointing out the outstanding durability of the electrothermochromic Janus fabric under the supplied voltage. It is realizable that the color of electrothermochromic Janus fabric is triggered accurately by varying the supplied voltage. The simplicity of this design makes it attractive for the application of flexible electrothermochromic textile, such as active visual camouflage, personal thermal management and information displays.