Large-scale self-assembly and stretch-induced plasmonic properties of core-shell metal nanoparticle superlattice sheets

Pengzhen Guo, Debabrata Sikdar, Xiqiang Huang, Kae Jye Si, Bin Su, Yi Chen, Wei Xiong, Lim Wei Yap, Malin Premaratne, Wenlong Cheng

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

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 cm2 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.
Original languageEnglish
Pages (from-to)26816 - 26824
Number of pages9
JournalJournal of Physical Chemistry C
Volume118
Issue number46
DOIs
Publication statusPublished - 2014

Cite this