Shape-selective deposition and assembly of anisotropic nanoparticles

Yu Zhou, Xiaozhu Zhou, Daniel J. Park, Korosh Torabi, Keith A. Brown, Matthew R. Jones, Chuan Zhang, George C. Schatz, Chad A. Mirkin

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64 Citations (Scopus)

Abstract

We report the large-area assembly of anisotropic gold nanoparticles into lithographically defined templates with control over their angular position using a capillary force-based approach. We elucidate the role of the geometry of the templates in the assembly of anisotropic nanoparticles consisting of different shapes and sizes. These insights allow us to design templates that immobilize individual triangular nanoprisms and concave nanocubes in a shape-selective manner and filter undesired impurity particles from a mixture of triangular prisms and other polyhedra. Furthermore, by studying the assembly of two particles in the same template, we elucidate the importance of interparticle forces in this method. These advances allow for the construction of face-to-face and edge-to-edge nanocube dimers as well as triangular nanoprism bowtie antennas. As an example of the fundamental studies enabled by this assembly method, we investigate the surface-enhanced Raman scattering (SERS) of face-to-face concave cube dimers both experimentally and computationally and reveal a strong polarization dependence of the local field enhancement.

Original languageEnglish
Pages (from-to)2157-2161
Number of pages5
JournalNano letters
Volume14
Issue number4
DOIs
Publication statusPublished - Apr 9 2014

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Keywords

  • Nanoprism
  • assembly
  • capillary force
  • concave nanocube
  • template

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Zhou, Y., Zhou, X., Park, D. J., Torabi, K., Brown, K. A., Jones, M. R., Zhang, C., Schatz, G. C., & Mirkin, C. A. (2014). Shape-selective deposition and assembly of anisotropic nanoparticles. Nano letters, 14(4), 2157-2161. https://doi.org/10.1021/nl500471g