Multifunctional FeO mesocrystals for cancer therapy: integrating hyperthermia and targeted drug delivery.

Mesocrystals with hierarchical architecture and crystallographically aligned nanoparticles hold immense potential for advanced applications in catalysis, energy storage and biomedicine. However, challenges arise for biomedical applications due to their surfactant-controlled growth, lack of understanding of magnetic mesocrystals and their dopant effect. Herein, we report a facile, additive-free solvothermal synthesis of FeO mesocrystals (∼205 nm) and investigate their morphological evolution by correlating the structural changes with respect to magnetic properties.