Ultrafast Heat Flow in Heterostructures of Au Nanoclusters on Thin Films: Atomic Disorder Induced by Hot Electrons.

@article{Vasileiadis2018UltrafastHF,
  title={Ultrafast Heat Flow in Heterostructures of Au Nanoclusters on Thin Films: Atomic Disorder Induced by Hot Electrons.},
  author={Thomas Vasileiadis and Lutz Waldecker and D Foster and Alessandra da Silva and Daniela Zahn and Roman Bertoni and Richard E. Palmer and Ralph Ernstorfer},
  journal={ACS nano},
  year={2018},
  volume={12 8},
  pages={
          7710-7720
        }
}
We study the ultrafast structural dynamics, in response to electronic excitations, in heterostructures composed of size-selected Au nanoclusters on thin-film substrates with the use of femtosecond electron diffraction. Various forms of atomic motion, such as thermal vibrations, thermal expansion, and lattice disordering, manifest as distinct and quantifiable reciprocal-space observables. In photoexcited supported nanoclusters, thermal equilibration proceeds through intrinsic heat flow between… Expand

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References

SHOWING 1-10 OF 114 REFERENCES
Dynamics of size-selected gold nanoparticles studied by ultrafast electron nanocrystallography.
TLDR
The degree of structural change and the thermodynamics of melting are found to depend on the size of nanoparticle, and dynamical full-profile radial distribution functions determined with subpicosecond and picometer accuracies. Expand
Ultrafast phase transition via catastrophic phonon collapse driven by plasmonic hot-electron injection.
TLDR
The demonstration of subpicosecond phase transformations that are triggered by optically induced electron injection opens the possibility of designing hybrid nanostructures with unique nonequilibrium properties as a critical step for all-optical nanophotonic devices with optimizable switching thresholds. Expand
Hot-Electron Dynamics and Thermalization in Small Metallic Nanoparticles
The important role played by hot electrons in photocatalysis and light harvesting has attracted great interest in their dynamics and mechanisms of generation. Here, we theoretically study theExpand
Momentum-Resolved View of Electron-Phonon Coupling in Multilayer WSe_{2}.
TLDR
A momentum-resolved picture of the energy transfer from excited electrons to phonons is obtained and this constitutes a basis for monitoring and predicting out of equilibrium electrical and thermal transport properties for nanoscale applications of TMDCs. Expand
Hot-electron-mediated surface chemistry: toward electronic control of catalytic activity.
TLDR
It is proposed that the manipulation of the flow of hot electrons by changing the electrical characteristics of metal-oxide and metal-semiconductor interfaces can give rise to the intriguing capability of tuning the catalytic activity of hybrid nanocatalysts. Expand
Order/Disorder Dynamics in a Dodecanethiol-Capped Gold Nanoparticles Supracrystal by Small-Angle Ultrafast Electron Diffraction.
TLDR
Femtosecond small-angle electron diffraction combined with angular cross-correlation analysis is applied, to retrieve the local arrangement from nanometer to interatomic scales in glassy aggregates, and shows that the dodecanethiol ligand chains, coating the gold cores, order in a preferential orientation on the nanoparticle surface and throughout the supracrystal. Expand
Thermal properties of graphene: Fundamentals and applications
Graphene is a two-dimensional (2D) material with over 100-fold anisotropy of heat flow between the in-plane and out-of-plane directions. High in-plane thermal conductivity is due to covalent sp 2Expand
Imaging transient melting of a nanocrystal using an X-ray laser
TLDR
Using an X-ray free electron laser, this work image the reversible melting of an individual nanocrystal induced by an ultrashort laser and demonstrates that the transient melting is reversible and nonhomogenous, consistent with a core-shell model of melting. Expand
Structural kinetics of laser-excited metal nanoparticles supported on a surface
Abstract Gold nanoparticles have been adsorbed as monolayers on silicon and glass substrates and the structure evolution following femtosecond laser excitation has been analyzed by means of timeExpand
Diffraction of quantum dots reveals nanoscale ultrafast energy localization.
TLDR
Observation of the lattice dynamics in nanoscale quantum dots of gallium arsenide using ultrafast electron diffraction is reported, finding that when the dot size is smaller, the energy remains localized in high-energy acoustic modes that travel coherently within the dot. Expand
...
1
2
3
4
5
...