Fig. 2From: Ready-to-use protein G-conjugated gold nanorods for biosensing and biomedical applicationsUpper panel: comparison of the spectra of optical extinction of colloidal suspensions of as-synthesised GNRs, PEGylated GNRs, antibody-coated GNRs by covalent binding and antibody-antigen-coated GNRs, from bottom to top. Spectra were offset by 0.1 cm−1 from each other, for the sake of comparison. Lower panel: representative TEM micrograph of as-synthesized GNRsBack to article page