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Characterization of multiplex SiO2-AuNRs. TEM images showing the size of the as-synthesized SiO2-AuNRs (prior to bioconjugation) with peak optical absorbances of 780 nm (a) and 830 nm (b). UV-Vis spectra showing the peak optical absorption of the targeted SiO2-AuNRs are shown in (c) and (d).
