Large-Scale Self-Assembly and Stretch-Induced Plasmonic
Properties of Core–Shell Metal Nanoparticle Superlattice Sheets
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Abstract
We report on a facile interfacial
self-assembly approach to fabricate large-scale metal nanoparticle
superlattice sheets from nonspherical core–shell nanoparticles,
which exhibited reversible plasmonic responses to repeated mechanical
stretching. Monodisperse Au@Ag nanocubes (NCs) and Au@Ag nanocuboids
(NBs) could be induced to self-assembly at the hexane/water interface,
forming uniform superlattices up to at least ∼13 cm<sup>2</sup> and giving rise to mirror-like reflection. Such large-area mirror-like
superlattice sheets exhibited reversible plasmonic responses to external
mechanical strains. Under stretching, the dominant plasmonic resonance
peak for both NB and NC superlattice sheets shifted to blue, following
a power-law function of the applied strain. Interestingly, the power-law
exponent (or the decay rate) showed a strong shape dependence, where
a faster rate was observed for NB superlattice sheets than that for
NC superlattice sheets