Scheme 1From: Indocyanine Green Loaded Reduced Graphene Oxide for In Vivo Photoacoustic/Fluorescence Dual-Modality Tumor ImagingThe synthesis route of rNGO-PEG/ICG from NGO. Step 1: PEGylation of NGO, step 2: reduction of NGO-PEG, step 3: loading ICG onto rNGO-PEGBack to article page