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(a) Photograph of a plasmonic film consisting of gold nanorods after being peeled off from petri-dish; (b) absorbance spectrum of the plasmonic film consisting of gold nanorods; (c) photograph of a plasmonic film consisting of gold nanorods and silver nanospheres after being peeled off from petri-dish; (d) absorbance spectrum of the plasmonic film consisting of gold nanorods and silver nanospheres.
