Fig. 1From: Sulfuric Acid Assisted Preparation of Red-Emitting Carbonized Polymer Dots and the Application of Bio-ImagingTEM images of sample OpPD (without H2SO4) (a) and SA-CPDs (b). c The size distribution of SA-CPDs. d The FT-IR spectra of sample OpPD and red CPDs. Sample OpPD and SA-CPDs were prepared from p-PD aqueous solution without and with H2SO4-assistedBack to article page