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(A) Electronic microscope images of the synthesized nanoparticles with a 1.55 atomic% gadolinium doping; two insets included are the magnified views of a gadolinium-doped mesoporous silica MCM-41 (Gd2O3@MCM-41). (B) Size distribution of Gd2O3@MCM-41 nanoparticles. (C) The energy dispersive spectrum measured the synthesized nanoparticles.
