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(A) Schematic illustration for the detection of AFP with Immuno-HCR and MEF of CNDs [36]. (B) Illustration of self-assembled monolayer formation and CND immobilization on a gold nanoslit surface [29]. (C) Electron transition process between CNDs and Ag or Ag@SiO2 NP for quenching (left) and enhancement (right) of fluorescence [39]. Reprinted with permission from [29,36,39].
