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Basic morphological characterizations of A-SeQDs and C-SeQDs. (A) The compositions of A-SeQDs and C-SeQDs were determined by the analysis of X-ray photoelectron spectroscopy. (B) The halo rings in A-SeQDs and C-SeQDs were observed by using electron diffraction pattern in the selected-area. (C) The diameters of A-SeQDs and C-SeQDs were observed by high resolution-transmission electron microscope. (D) The diameter’s distributions of both A-SeQDs and C-SeQDs were shown.
