Design an adaptive sliding mode controller for drive-response synchronization of two different uncertain fractional-order chaotic systems with fully unknown parameters

► The adaptive sliding mode controller is designed for synchronization. ► The fractional-order slave system is in the presence of uncertainties and disturbances. ► The bounds of unknown parameters, uncertainties and disturbances are unknown. ► The adaptive sliding mode law is used to stabilize the states of the error systems. ► Numerical simulations are provided to illustrate the effectiveness of the proposed method.