Welcome to the latest issue of the Materials Today journal.

This month Stanislav Presolski and Martin Pumera review transition metal dichalcogenide (TMD) covalent functionalization and explore the prospective avenues for hybrid organic-inorganic nanomaterials, in Covalent functionalization of MoS2; Liangti Qu and colleagues present current progress in stimulus-induced deformation of graphene, and summarize recent advancements of SID of graphene for applications in smart systems, in Stimuli-deformable graphene materials: from nanosheet to macroscopic assembly; Richard A. Revia and Miqin Zhang consider recent applications of magnetite nanoparticles in the diagnosis, treatment, and treatment monitoring of cancer., and discuss concerns on the toxicity and clinical translation of iron oxide nanoparticles, in Magnetite nanoparticles for cancer diagnosis, treatment, and treatment monitoring: recent advances; and finally, Xiong Gong et al. review Interfacial engineering for high performance organic photovoltaics and provide an overview on the recent progress of the materials as well as the underlying device physics of interfacial engineering and the origins of enhanced power conversion efficiencies.

As always, we hope you enjoy this issue of Materials Today.

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DOI: 10.1016/j.mattod.2016.02.022