Fig. 2.

Effect of nanoparticle polydispersity on extinction. (A) Simulated extinction efficiencies for Au spheres with diameters ranging from 10 to 100 nm (yellow to red). (B) A scheme of nanoparticle polydispersity across the normal distribution; particles are drawn to scale. (C) Binned nanoparticle diameter counts determined by TEM, n = 100. (D) Simulated extinction spectra for superlattices incorporating increasing extents of polydispersity. The dashed lines are the experimental traces for the superlattice films in solution.