Article Title

Negative supracrystals inducing a FCC-BCC transition in gold nanocrystal superlattices

Authors

Nicolas Goubet, Université Pierre et Marie Curie Paris 6, UMR 7070, LM2N, BP 52, 4 place Jussieu, 75005 Paris, France Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7070, LM2N, 4 place Jussieu, 75005 Paris, France
Marie-Paule Pileni, Université Pierre et Marie Curie Paris 6, UMR 7070, LM2N, BP 52, 4 place Jussieu, 75005 Paris, France Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7070, LM2N, 4 place Jussieu, 75005 Paris, France

Keywords

Negative crystal, Bain transformation, nanocrystal superlattice, supracrystal, gold nanocrystal, self-assembly

Abstract

The growth of nanocrystal superlattices of 5 nm single domain Au nanocrystals at an air–toluene interface induces formation of well-defined thin films (300–400 nm) with large coherence lengths. High-resolution electron microscopy showed that polyhedral holes (negative supracrystal) were formed on the nanocrystal superlattice surface. Formation of negative supracrystals is attributed to inclusion in the superlattice of organic molecules (dodecanethiol), which are present in concentrated zones at the air–toluene interface. The coexistence of two supracrystalline structures (bcc/fcc) is attributed to diffusion of dodecanethiol molecules resulting in a Bain deformation of the nanocrystal array.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-013-0384-9

Publisher

Tsinghua University Press

Recommended Citation

Nicolas Goubet,Marie-Paule Pileni, Negative supracrystals inducing a FCC-BCC transition in gold nanocrystal superlattices. NanoRes.2014, 7(2): 171–179