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GNR characterization. (A) Light absorption profile and (B) transmission electron micrograph of GNRs. Panel A shows the absorbance profile of CTAB stabilized GNRs (GNRs), CTAB stabilized GNRs with 3.5% NaCl (GNRs + NaCl) as well as RGDfK-PEG-GNRs with and without 3.5% NaCl (RGDfK – GNRs ± NaCl). Without the polymer coating, GNRs aggregate in the presence of NaCl, whereas those stabilized with PEG-RGDfK are stable in the presence of salt.
