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Tunable 2D binary colloidal alloys for soft nanotemplating

  • Fernández-Rodríguez, Miguel Ángel Laboratory for Interfaces, Soft matter and Assembly, Department of Materials, ETH Zurich, Switzerland
  • Elnathan, Roey Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences Monash University, Parkville, Australia
  • Ditcovski, Ran Department of Physical Electronics, School of Electrical Engineering, Tel Aviv University, Israel
  • Grillo, Fabio Laboratory for Interfaces, Soft matter and Assembly, Department of Materials, ETH Zurich, Switzerland
  • Conley, Gaurasundar Marc Department of Physics, University of Fribourg, Switzerland
  • Timpu, Flavia Institute for Quantum Electronics, Department of Physics, ETH Zurich, Switzerland
  • Rauh, Astrid Physical Chemistry I, Heinrich-Heine-University Duesseldorf, Germany
  • Geisel, Karen Physical Chemistry II, RWTH Aachen University, Aachen, Germany
  • Ellenbogen, Tal Department of Physical Electronics, School of Electrical Engineering, Tel Aviv University, Israel
  • Grange, Rachel Institute for Quantum Electronics, Department of Physics, ETH Zurich, Switzerland
  • Scheffold, Frank Department of Physics, University of Fribourg, Switzerland
  • Karg, Matthias Physical Chemistry I, Heinrich-Heine-University Duesseldorf, Germany
  • Richtering, Walter Physical Chemistry II, RWTH Aachen University, Aachen, Germany
  • Voelcker, Nicolas H. Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences Monash University, Parkville, Australia - Melbourne Centre for Nanofabrication, Victorian Node of the Australian National Fabrication Facility, Clayton, Australia - INM-Leibniz Institute for New Materials, Saarbrücken, Germany
  • Isa, Lucio Laboratory for Interfaces, Soft matter and Assembly, Department of Materials, ETH Zurich, Switzerland
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    06.12.2018
Published in:
  • Nanoscale. - 2018, vol. 10, no. 47, p. 22189–22195
English The realization of non-close-packed nanoscale patterns with multiple feature sizes and length scales via colloidal self-assembly is a highly challenging task. We demonstrate here the creation of a variety of tunable particle arrays by harnessing the sequential self-assembly and deposition of two differently sized microgel particles at the fluid–fluid interface. The two-step process is essential to achieve a library of 2D binary colloidal alloys, which are kinetically inaccessible by direct co-assembly. These versatile binary patterns can be exploited for a range of end-uses. Here we show that they can for instance be transferred to silicon substrates, where they act as masks for the metal-assisted chemical etching of binary arrays of vertically aligned silicon nanowires (VA-SiNWs) with fine geometrical control. In particular, continuous binary gradients in both NW spacing and height can be achieved. Notably, these binary VA- SiNW platforms exhibit interesting anti-reflective properties in the visible range, in agreement with simulations. The proposed strategy can also be used for the precise placement of metallic nanoparticles in non-close-packed arrays. Sequential depositions of soft particles enable therefore the exploration of complex binary patterns, e.g. for the future development of substrates for biointerfaces, catalysis and controlled wetting.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307493
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