Fig. 9: A simple and convenient method for achieving the controllable growth of ultrathin manganese dioxide nanosheets.
From: Strategies to improve photodynamic therapy efficacy by relieving the tumor hypoxia environment

a Schematics of the formation and functional mechanism of PDA@ut-MnO2/MB NFs; b SEM micrograph of PDA@ut-MnO2NFs; TEM micrographs of PDA@ut-MnO2NFs at c low and d high resolution (the arrows point out the ultrathin MnO2 nanosheets); e HRTEM micrograph of MnO2 nanosheets; and f–j a HAADF-STEM micrograph and elemental mapping of Mn, O, N, and C of PDA@ut-MnO2 NFs. Copyright 2019, Royal Society of Chemistry (ref. 50).