Disclosed is a biosensor coated with an electroactive polymer layer demonstrating a bending behavior, more specifically a biosensor including an electroactive polymer layer coated on the surface of a bioreceptor and an electrode connected to the electroactive polymer layer. When an electrical stimulation is applied to the electrode, the electroactive polymer layer shows a bending behavior and thus the surface of the bioreceptor can be exposed to an analyte to allow a concentration analysis of the analyte. When used as an implantable biosensor, the disclosed biosensor may have a substantially increased life span since the bioreceptor can be selectively exposed to the analyte.
