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Lecture

Solid-state dewetting of metallic thin films

Thursday (29.09.2016)
12:30 - 12:45
Part of:


Thin films are characterized by their high surface-to-volume ratio which produces a large driving force for thermal agglomeration due to surface energy minimization. This phenomenon is known as dewetting and can occur well below the melting temperature of the layer material even in solid-state. In recent years, understanding the mechanisms of solid-state dewetting of thin (metal) films has become a broad field of research. As a useful side-effect, the dewetting is a promising method to fabricate various nanostructures with potential applications in ecology such as catalysis, or information technology such as sensory/memory devices [1-3]. Also photonic nanocrystals are focused on [4]. Alloy nanostructures may unveil even new properties due to the combination of size and composition [5, 6]. The aim of the work presented here is to show alloying effects on the dewetting and how to use Ag-Au, Au-Ni, and Au-W bilayer thin films for the self-assembly of alloy nanoparticles.


[1] Geiger C, Carvalho-Knighton K. Environmental Applications of Nanoscale and Microscale Reactive Metal Particles (Oxford University Press, New York, 2010).

[2] Liu Z, Lee C, Narayanan V, Pei G, Kan EC. Metal nanocrystal memories. I. Device design and fabrication. IEEE Transactions on Electron Devices 2002;49:1606.

[3] Chang T-C, Jian F-Y, Chen S-C, Tsai Y-T. Developments in nanocrystal memory. Materials Today 2011;14:608.

[4] Sun H, Yu M, Wang G, Sun X, Lian J. Temperature-Dependent Morphology Evolution and Surface Plasmon Absorption of Ultrathin Gold Island Films. The Journal of

Physical Chemistry C 2012;116:9000.

[5] Vidal C, Wang D, Schaaf P, Hrelescu C, Klar TA. Optical Plasmons of Individual Gold Nanosponges. ACS Photonics 2015.

[6] Wu Y, Li G, Cherqui C, Bigelow NW, Thakkar N, Masiello DJ, Camden JP, Rack PD. Electron Energy Loss Spectroscopy Study of the Full Plasmonic Spectrum of

Self-Assembled Au–Ag Alloy Nanoparticles: Unraveling Size, Composition, and Substrate Effects. ACS Photonics 2016;3:130.

 

Speaker:
Andreas Herz
Technische Universität Ilmenau
Additional Authors:
  • Dr. Dong Wang
    Technical University of Ilmenau
  • Dr. Martin Friák
    Academy of Sciences of the Czech Republic
  • Prof. Dr. Peter Schaaf
    Technical University of Ilmenau