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Plasmon resonance wavelength as a function of the refractive index (a: LSPR 2, b: LSPR 3), when the gold nanostars are suspended in different solvents: water (n = 1.3300); acetonitrile (n = 1.3442); ethanol (n = 1.3611); ethyl acetate (n = 1.3723); n-butanol (n = 1.3990); N,N-dimethylformamide (n = 1.4300); chloroform (n = 1.4476); toluene (n = 1.4961).
