Chitosan‐Gated Magnetic‐Responsive Nanocarrier for Dual‐Modal Optical Imaging, Switchable Drug Release, and Synergistic Therapy

A dual-layer shell hollow nanostructure as drug carrier that provides instant on/off function for drug release and contrast enhancement for multimodal imaging is reported. The on-demand drug release is triggered by irradiation of an external magnetic field. The nanocarrier also demonstrates a high drug loading capacity and synergistic magnetic-thermal and chemotherapy.