Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Nanostructures at Surfaces: Metals, Oxides and Semiconductors II

O 41.1: Vortrag

Dienstag, 21. März 2017, 14:00–14:15, REC/PHY C213

Lattice dynamics of laser-excited Au nanoclusters observed by femtosecond electron diffraction — •Thomas Vasileiadis1, Dawn Wells2, Lutz Waldecker1, Alessandra Da Silva2, Roman Bertoni1, Richard Palmer2, and Ralph Ernstorfer11Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany — 2Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK

Metallic nanoclusters (NCs) have dominated the field of light-harvesting technologies and photo-catalysis [1]. For all these applications it is important to know how heat flows in the nanoscale and if the crystalline order is affected. We address this question using femtosecond electron diffraction [2] to study size-selected Au NCs on various substrates [3]. We resolve lattice-heating, expansion and surface disordering using the height, scattering vector and width of diffraction peaks respectively. In addition, we show that for NCs on 2D crystals a pre-existing crystallographic texture can reveal morphological changes. Finally, we present a model of heat flow in low-dimensional heterostructures to estimate electronic and vibrational coupling to the substrate.

[1]M.L. Brongersma et al., Nat. Nanotech. 10, 25-34 (2015).

[2]L. Waldecker et al., J. Appl. Phys. 117, 044903 (2015).

[3]S. R. Plant, L. Cao, and R.E. Palmer, J. Am. Chem. Soc., 136, 7559-7562 (2014).

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