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TEM image, extinction spectra, GNR length distribution histogram, and GNR diameter distribution histogram. (a) TEM image of a GNR powder redispersed in water. (b) Extinction spectra of the as-prepared GNRs and GNR powder after freeze-drying. (c) GNR length distribution histogram. (d) GNR diameter distribution histogram. The average length and diameter of GNRs are both in nanometers.
