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(a) Schematic illustration of single NaYF4@Si-DTTA-Gd3+ NPs. (b) DLS data of NaYF4 NPs before (dashed line) and after Si-DTTA-Gd3+ coating (solid line). (c,d) TEM images of NaYF4@Si-DTTA-Gd3+ NPs at different magnification. Reproduced from [19], with permission from ACS Publisher, 2009.
