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Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction

We demonstrate that highly ordered two-dimensional crystals of ligand-capped gold nanoparticles display a local photo-mechanical stiffness as high as that of solids such as graphite. In out-of-equilibrium electron diffraction experiments, a strong temperature jump is induced in a thin film with a fe...

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Autores principales: Mancini, Giulia Fulvia, Pennacchio, Francesco, Latychevskaia, Tatiana, Reguera, Javier, Stellacci, Francesco, Carbone, Fabrizio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Crystallographic Association 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6461555/
https://www.ncbi.nlm.nih.gov/pubmed/31041361
http://dx.doi.org/10.1063/1.5091858
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author Mancini, Giulia Fulvia
Pennacchio, Francesco
Latychevskaia, Tatiana
Reguera, Javier
Stellacci, Francesco
Carbone, Fabrizio
author_facet Mancini, Giulia Fulvia
Pennacchio, Francesco
Latychevskaia, Tatiana
Reguera, Javier
Stellacci, Francesco
Carbone, Fabrizio
author_sort Mancini, Giulia Fulvia
collection PubMed
description We demonstrate that highly ordered two-dimensional crystals of ligand-capped gold nanoparticles display a local photo-mechanical stiffness as high as that of solids such as graphite. In out-of-equilibrium electron diffraction experiments, a strong temperature jump is induced in a thin film with a femtosecond laser pulse. The initial electronic excitation transfers energy to the underlying structural degrees of freedom, with a rate generally proportional to the stiffness of the material. Using femtosecond small-angle electron diffraction, we observe the temporal evolution of the diffraction feature associated with the nearest-neighbor nanoparticle distance. The Debye-Waller decay for the octanethiol-capped nanoparticle supracrystal, in particular, is found to be unexpectedly fast, almost as fast as the stiffest solid known and observed by the same technique, i.e., graphite. Our observations unravel that local stiffness in a dense supramolecular assembly can be created by van der Waals interactions up to a level comparable to crystalline systems characterized by covalent bonding.
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spelling pubmed-64615552019-04-30 Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction Mancini, Giulia Fulvia Pennacchio, Francesco Latychevskaia, Tatiana Reguera, Javier Stellacci, Francesco Carbone, Fabrizio Struct Dyn ARTICLES We demonstrate that highly ordered two-dimensional crystals of ligand-capped gold nanoparticles display a local photo-mechanical stiffness as high as that of solids such as graphite. In out-of-equilibrium electron diffraction experiments, a strong temperature jump is induced in a thin film with a femtosecond laser pulse. The initial electronic excitation transfers energy to the underlying structural degrees of freedom, with a rate generally proportional to the stiffness of the material. Using femtosecond small-angle electron diffraction, we observe the temporal evolution of the diffraction feature associated with the nearest-neighbor nanoparticle distance. The Debye-Waller decay for the octanethiol-capped nanoparticle supracrystal, in particular, is found to be unexpectedly fast, almost as fast as the stiffest solid known and observed by the same technique, i.e., graphite. Our observations unravel that local stiffness in a dense supramolecular assembly can be created by van der Waals interactions up to a level comparable to crystalline systems characterized by covalent bonding. American Crystallographic Association 2019-04-12 /pmc/articles/PMC6461555/ /pubmed/31041361 http://dx.doi.org/10.1063/1.5091858 Text en © 2019 Author(s). 2329-7778/2019/6(2)/024304/6 All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle ARTICLES
Mancini, Giulia Fulvia
Pennacchio, Francesco
Latychevskaia, Tatiana
Reguera, Javier
Stellacci, Francesco
Carbone, Fabrizio
Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title_full Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title_fullStr Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title_full_unstemmed Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title_short Local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
title_sort local photo-mechanical stiffness revealed in gold nanoparticles supracrystals by ultrafast small-angle electron diffraction
topic ARTICLES
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6461555/
https://www.ncbi.nlm.nih.gov/pubmed/31041361
http://dx.doi.org/10.1063/1.5091858
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