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(A) TEM image of Cu-doped AuNCs (1%Cu). (B) The absorption and emission spectrum of Cu-doped AuNCs (1% Cu). (C) Intensity changes of 64CuCl2 and 64Cu-doped AuNCs at different optical filter sets. (D, E) Representative CRET images and photon flux of 64Cu-doped AuNCs on the U87MG tumor model. Reproduced with permission 54. Copyright 2014, Elsevier.
