CTAB-NRI was synthesized by the seed growth method.12,22 Typically, 1 mL AgNO3 aqueous solution (10 mM), 2 mL HAuCl4 aqueous solution (1 wt%), 0.8 mL HCl aqueous solution (1 M), and 0.55 mL l-AA aqueous solution (0.1M) were added sequentially mixed under slow stirring. After 1 min, 180 μL seeds were added and incubated overnight in a 25 °C water bath.

CTAB-NRII and CTAB-NRIII were prepared by the oxidation-etching method from CTAB-NRI.21 Briefly, the CTAB-NRI was suspended in 0.1 M CTAB for centrifugation. The aqueous HAuCl4 solution was added to 15 mL GNRs solution with an optical density (OD) = 2 at 60 °C for 15 min, followed by centrifugation in 2 mM CTAB solution. The amount of HAuCl4 during the preparation of CTAB-NRII and CTAB-NRIII was 70 and 140 μL, respectively.

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