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(a) Transmission electron micrograph of monodisperse GNR coated with PEG and Tat cell internalization peptide. Scale bar is 100 nm. (b) Normalized extinction spectra of the synthesized GNR with SPR at 900 nm (10 × 50 nm, black) and 980 nm (10 × 59 nm, gray). Normalized intensity spectra of the commercial OCT (XR, red) and swept-source OCT systems (SS, blue).
