Fig. 2: Afterglow imaging and quantification of electron transfer.
From: Electron transfer-triggered imaging of EGFR signaling activity
a Afterglow image (upper) and readout signal intensity mapping image (lower) of persistent luminescence nanoparticles (I, Sr2MgSi2O7:Eu,Dy, color scale: 2.50 × 107–1.44 × 109; II, SrAl2O4:Eu,Dy, color scale: 2.50 × 107–1.44 × 109; III, ZnGa2O4:Cr, color scale: 2.00 × 107–1.10 × 108; IV, Zn3(PO4)2:Mn2+,Ga3+, color scale: 1.25 × 107–2.00 × 1010) under different conditions (air, water, and GOD solution with 0.0–5.0 mM glucose) at 1.0 s after white light excitation. b Schematic of the three-electrode electrochemical set-up used. c Schematic of the ZnGa2O4/GOD coating on a glassy carbon electrode in glucose-containing electrolyte. d Typical voltammograms showing oxidation and reduction peaks of phosphate-buffered solution (PBS) solution of glucose at various concentrations (0.0–5.0 mM) on a fresh ZnGa2O4/GOD-coated electrode. e Extracted relative afterglow intensity mean values (red circles) from the afterglow images a and extracted reduction peak current mean values (gray squares) from the voltammograms versus the concentration of glucose (n = 3 independent electrodes). Error bars in all graphs represent the s.d. of the mean values.
