Fig. 1From: Indocyanine Green Loaded Reduced Graphene Oxide for In Vivo Photoacoustic/Fluorescence Dual-Modality Tumor ImagingReduction of NGO-PEG. a The average hydrodynamic diameter of NGO, NGO-PEG, and rNGO-PEG. b FT-IR spectra of NGO, NGO-PEG, and rNGO-PEG. c, d XPS spectra of NGO-PEG and rNGO-PEG. Inset: Photographs of NGO-PEG and rNGO-PEG solutionsBack to article page