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SEM (a and b) and TEM (c and d) images of the flower-like Mn3O4 nano structures. Wang, Y., Zhu, L., Yang, X., Shao, E., Deng, X., Liu, N., Wu, M., 2015, Facile synthesis of three-dimensional Mn3O4 hierarchical microstructures and their application in the degradation of methylene blue, J. Mater. Chem. A. 3, 2934–294 -Reproduced by permission of The Royal Society of Chemistry.
