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Characterization of AuNRs and plasmonic paper. (A) Representative transmission electron microscopy image of AuNRs dispersed in nanopure water. (B) Representative ultraviolet-visible light extinction spectrum of PSS-AuNRs in nanopure water. (C) Representative scanning electron microscopy image of PSS-AuNRs adsorbed on filter paper after “drawing” by plasmonic calligraphy.
