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A) TEM image of the five AuNRs. From left to right: P1: 2×10 nm, aspect ratio 5; P2: 10×37 nm, aspect ratio 3.7; P3: 13×40 nm, aspect ratio 3; P4: 13×70 nm, aspect ratio 5.5; P5: 18×45 nm, aspect ratio 5. B) UV-vis absorption spectra of the five AuNRs.
