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. 2022 Apr 1;189(4):171. doi: 10.1007/s00604-022-05272-y

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Fig. 1 — Changes in the UV–visible-NIR spectra for a the different stages of the seed-mediated procedure for AuNTs preparation b UV–visible-NIR spectra of the final reaction mixture by depletion: (black line) mixture, (red line) redispersed precipitate, (blue line) supernatant. The TEM images in the insets are for the mixture and the AuNTs after the separation. c TEM images of the AuNTs. d Histogram obtained by measuring different TEM images. e 3D AFM image of a single AuNT with a topographic profile taken along the blue line and f 2D AFM image of a group of AuNTs