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Left: Comparing the conventional seed-mediated protocol and the two steps approach. Right: TEM images, scale bars 100 nm. (a–c) Different AuNR volume in function of seed concentration. (d) Correlation between seed concentration scaling factor (m) and the final AuNR volume (V). (e–g) Effect of the change of surfactant in the second growth solution on the AuNR aspect ratio. (h) UV-vis spectra of the AuNRs e–g. Reproduced from [30] with permission from the American Chemical Society.
