Jump to main content
Jump to site search

Issue 28, 2017
Previous Article Next Article

Second order directed positioning of nanoparticles induced by the main terminal meniscus shape in irregular template cavities

Author affiliations

Abstract

Directed self-assembly of nanoparticles using topographical templates has demonstrated great capabilities of ordering particles at their maximum packing fraction resulting from template confinement effects and free energy minimization. However, to self-assemble nanostructures at a lower packing fraction with a precise control over particle's positioning is challenging due to the high entropy of such a system. Here, by fabricating templates of irregular cavities together with appropriate choice of solvent, we demonstrate the positioning of 8 nm Au nanoparticles within individual cavities at a low filling factor. In addition to the first-order of ordering dictated by the template topography, there is a second-order of ordering induced by the interplay between the evaporation of the residual solvent trapped within the cavities and their intrinsic geometries. The experimental results show that the cavities shaped as equilateral triangles exhibit a random positioning of the particles at the corners; in comparison, right-angled scalene (or irregular) triangles show a more controllable positioning of the particles within the corners of the smallest angle. Finally, this technique has been successfully used to fabricate arrays of dimers with a controllable center-to-center distances at sub-5 nm length scales.

Graphical abstract: Second order directed positioning of nanoparticles induced by the main terminal meniscus shape in irregular template cavities

Back to tab navigation

Publication details

The article was received on 07 Apr 2017, accepted on 10 Jun 2017 and first published on 05 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR02455J
Citation: Nanoscale, 2017,9, 9886-9892
  •   Request permissions

    Second order directed positioning of nanoparticles induced by the main terminal meniscus shape in irregular template cavities

    M. Asbahi, Z. Dong, F. Wang, M. S. M. Saifullah, J. K. W. Yang and K. S. L. Chong, Nanoscale, 2017, 9, 9886
    DOI: 10.1039/C7NR02455J

Search articles by author

Spotlight

Advertisements