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Table 2 Saporin conjugation of QDs characterized by X-ray photoelectron spectroscopy

From: Selective targeting of microglia by quantum dots

   Binding Energy (eV) Atomic %
A.    Silicon QDs QD-Sap
  Se3d3/2 57 0 0.47 0.36
  Si2s 151 50.62 0 0
  S2p1/2 165 0 1.8 1.25
  C1s 285 9.09 78.08 80.27
  N1s 398 0 1.24 0.74
  Cd3d5/2 405    
  O1s 523 40.29 17.94 17.02
  Zn2p3/2 1022 0 0.47 0.36
B.    Silicon QDs QD-Sap
  285.2eV C-H (hydrocarbon) 100 65 54
  286.8eV CH2N (amine) 0 27 32
  288.0eV O = C-N (amide) 0 8 14
  1. A. Surface elemental composition calculated by XPS survey scans. B. High-resolution C1s peak deconvoluted into its components and indicating the composition of individual peaks on each surface