Beyond entropy: magnetic forces induce formation of quasicrystalline structure in binary nanocrystal superlattices

Journal of the American Chemical Society
Zhijie YangMarie-Paule Pileni

Abstract

Here, it is shown that binary superlattices of Co/Ag nanocrystals with the same size, surface coating, differing by their type of crystallinity are governed by Co-Co magnetic interactions. By using 9 nm amorphous-phase Co nanocrystals and 4 nm polycrystalline Ag nanocrystals at 25 °C, triangle-shaped NaCl-type binary nanocrystal superlattices are produced driven by the entropic force, maximizing the packing density. By contrast, using ferromagnetic 9 nm single domain (hcp) Co nanocrystals instead of amorphous-phase Co, dodecagonal quasicrystalline order is obtained, together with less-packed phases such as the CoAg13 (NaZn13-type), CoAg (AuCu-type), and CoAg3 (AuCu3-type) structures. On increasing temperature to 65 °C, 9 nm hcp Co nanocrystals become superparamagnetic, and the system yields the CoAg3 (AuCu3-type) and CoAg2 (AlB2-type) structures, as observed with 9 nm amorphous Co nanocrystals. Furthermore, by decreasing the Co nanocrystal size from 9 to 7 nm, stable AlB2-type binary nanocrystal superlattices are produced, which remain independent of the crystallinity of Co nanocrystals with the superparamagnetic state.

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Citations

Feb 26, 2016·Journal of the American Chemical Society·Zhijie YangMarie-Paule Pileni
Nov 10, 2015·Journal of the American Chemical Society·Jingjing WeiMarie-Paule Pileni
Jun 22, 2016·Nature Chemistry·José I UrgelJohannes V Barth
Aug 24, 2016·Chemical Reviews·Michael A BolesDmitri V Talapin
Nov 1, 2016·Nature Materials·Xingchen YeChristopher B Murray
Mar 18, 2016·Chemical Communications : Chem Comm·Lin-Xiu DaiYa-Wen Zhang
Aug 8, 2018·Nanoscale·Detlef-M SmilgiesMarie Paule Pileni
Mar 10, 2018·Chemistry : a European Journal·Dan Guo, Yanlin Song
Jun 16, 2018·Journal of the American Chemical Society·Tommy WaltmannAlex Travesset
Dec 20, 2017·Journal of the American Chemical Society·Dan GuoYanlin Song
Oct 28, 2017·ACS Nano·Curt WaltmannAlex Travesset
Jan 7, 2020·Journal of the American Chemical Society·Peter J Santos, Robert J Macfarlane

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