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(a) Vis–NIR spectra of different plasmonic nanoparticles dispersed in ethanol:hexane (1:4). (b) Vis–NIR spectra of plasmonic nanoparticle monolayers transferred onto a transparent glass substrate. (c–f) TEM images of Au 50 (c), mAuNSs (d), AuNRs (e), and Ag 50 (f) monolayers upon transfer onto TEM grids.
