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Giant Plasmene Nanosheets, Nanoribbons, and Origami
We introduce <i>Plasmene</i>î¸ in analogy to grapheneî¸as free-standing, one-particle-thick, superlattice sheets of nanoparticles (âmeta-atomsâ) from the âplasmonic periodic tableâ, which has implications in many important research disciplines. Here, we report on a general bottom-up self-assembly approach to fabricate giant plasmene nanosheets (<i>i.e.</i>, plasmene with nanoscale thickness but with macroscopic lateral dimensions) as thin as âź40 nm and as wide as âź3 mm, corresponding to an aspect ratio of âź75â000. In conjunction with topâdown lithography, such robust giant nanosheets could be milled into one-dimensional nanoribbons and folded into three-dimensional origami. Both experimental and theoretical studies reveal that our giant plasmene nanosheets are analogues of graphene from the plasmonic nanoparticle family, simultaneously possessing unique structural features and plasmon propagation functionalities