Article Title

Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices

Authors

Yanfen Wan, 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
Hervé Portalès, 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
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
Alain Mermet, Université Lyon 1, Institut Lumière Matière, Unité Mixte de Recherche 5306 CNRS, Bt. A. Kastler, 10 rue Ada Byron, 69622 Villeurbanne, 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

supracrystals, close-packed self-assembly, metal nanoparticles, Raman scattering spectroscopy

Abstract

ABSTRACT A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn¬thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed: the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-013-0337-3

Publisher

Tsinghua University Press

Recommended Citation

Yanfen Wan,Hervé Portalès,Nicolas Goubet,Alain Mermet,Marie-Paule Pileni, Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices. NanoRes.2013, 6(7): 611–618