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STEM images of GNS-1 (a), GNS-2 (b), and GNS-3 (c) showing that the spike morphology was changed from spherical tips to pointy tips and the spike length was increased from GNS-1 to GNS-3. STEM images with multiple nanostars of GNS-1 (d), GNS-2 (e), and GNS-3 (f) showing high monodispersity of the synthesis.
