Volume 119, Number 3, August 2017
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||25 October 2017|
3D superlattices of uniform metal nanocrystals differing by their sizes called binary supracrystals(a)
1 Sorbonne Universités, UPMC Univ Paris 06, UMR 8233, MONARIS - F-75005, Paris, France
2 Université Paris Diderot, Sorbonne Paris Cité, ITODYS - 15 Rue J-A de Baïf, F-75205 Paris, Cedex 13, France
3 CEA/IRAMIS, CEA Saclay - F-91191, Gif-sur-Yvette, France
Received: 12 September 2017
Accepted: 28 September 2017
By mixing uniform large and small nanocrystals (NCs), three-dimensional (3D) crystalline structures referred to as supracrystals (SCs) are produced. The small NCs fill in the interstices of large NCS self-assembled in well-defined patterns. Various binary structures are produced, in specific conditions, as predicted by a hard-sphere model. It is demonstrated that the ligands used to stabilize NCs play the role of a key parameter in the final structure, as well as the crystalline structure of the NCs, called nanocrystallinity, with production of one-component SCs characterized by vicinal surfaces. Quasi-binary SCs are produced either by a ligand exchange process during the SC growth or through magnetic forces. Using magnetic NCs having two different diameters shows unexpected destructive magnetic property.
PACS: 81.07.Bc – Nanocrystalline materials / 81.16.Dn – Self-assembly / 61.46.-w – Structure of nanoscale materials
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