3D quantitative analysis of platinum nanocrystal superlattices by electron tomography

ACS Nano
Ileana FloreaOvidiu Ersen

Abstract

The work reported herein focuses on the 3D relative arrangement of individual platinum nanocrystals with a size of about 5 nm, and on the structure of the superlattices, they spontaneously form. Electron tomography was systematically used in this study because it allows obtaining quantitative 3D information in real space. Performing tomography in the bright-field TEM mode allowed investigating the short and long-range orderings of the nanoparticles packed as self-organized supercrystals. Systematic fcc pilings were observed with a mean lattice parameter measured to be 19.5 nm, the nature of the arrangement being controlled by the truncated octahedral morphology of platinum nanocrystals and the associated steric effects. A numerical 3D quantitative analysis of the ordering characteristics of the superlattice with a nanometer resolution has been performed that, for the first time, showed a direct correlation between single entities' characteristics and their ordering in periodic arrays. It has been shown that the lattice parameter is different in two orthogonal directions of the fcc structure, which indicates the presence of a slightly compressed superlattice. Inside the superstructure, vacancies and axial defects were observed t...Continue Reading

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Citations

Feb 14, 2013·Nano Letters·Mark P BoneschanscherDaniel Vanmaekelbergh
Mar 16, 2013·Nano Letters·Maryna I BodnarchukMaksym V Kovalenko
Feb 25, 2014·Journal of Colloid and Interface Science·Ankur DuttaPuspanjali Sahu
Nov 27, 2015·Nanoscale·Daniele ZanagaGustaaf Van Tendeloo
Dec 31, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·J E Galván-MoyaF M Peeters
Mar 15, 2014·ACS Nano·Jesus E Galván-MoyaGustaaf Van Tendeloo
Jul 22, 2020·Chemical Society Reviews·Kerong DengZewei Quan

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