Self-assembled Au nanoparticle superlattice via a displacement reaction

J. C. Hu, P. Y. Su, V. Lapeyronie, S. L. Cheng, M. Y. Lin, L. J. Chen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Long-range order, uniform in size, and regular in shape two-dimensional (2-D) arrays of core-shell structure Au nanoparticles have been synthesized. A reaction involving the displacement of the outer shells from tetraoctylammonium bromide (TOAB) to dodecanethiol (DT) molecules was used to form Au@TOAB-DT nanoparticles at room temperature (RT). The displacement reaction has used both superior size and shape control of Au@TOAB nanoparticles and uniform dispersion capability of Au@DT nanoparticles to achieve an extraordinarily large in extent (3 μm × 3 μm), regular nanoparticle lattice structure. From ultraviolet (UV)-visible spectra, it was inferred that the interaction between the inner core and outer shell of Au@TOAB nanoparticles is weaker than that of Au@TOAB-DT and Au@DT samples. As a result, the ability of the TOAB outer shell to protect the Au@TOAB nanoparticles is weaker so that the system is more prone to agglomerate. On the other hand, the strong interactions between the inner core and outer shell for Au@TOAB-DT and Au@DT nanoparticles led to a predominantly 2-D structure.

Original languageEnglish
Pages (from-to)1058-1063
Number of pages6
JournalJournal of Electronic Materials
Issue number10
StatePublished - Oct 2004


  • Au nanoparticle
  • Displacement reaction
  • Long-range order


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