Large-Scale Self-Assembly and Stretch-Induced Plasmonic Properties of Core鈥揝hell Metal Nanoparticle Superlattice Sheets

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• 作者：Pengzhen Guo ; Debabrata Sikdar ; Xiqiang Huang ; Kae Jye Si ; Bin Su ; Yi Chen ; Wei Xiong ; Lim Wei Yap ; Malin Premaratne ; Wenlong Cheng
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：November 20, 2014
• 年：2014
• 卷：118
• 期：46
• 页码：26816-26824
• 全文大小：447K
• ISSN：1932-7455

文摘

We report on a facile interfacial self-assembly approach to fabricate large-scale metal nanoparticle superlattice sheets from nonspherical core鈥搒hell 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 鈭?3 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.