Multi-dimensional control of surfactant-guided assemblies of quantum gold particles

Qingmin Ji, Somobrata Acharya, Jonathan P. Hill, Gary J. Richards, Katsuhiko Ariga

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


The controlled assembly of monodispersed Au NPs (gold nanoparticles) into multi-dimensional 1D, 2D, and 3D structures by using ionic and nonionic surfactants was reported. Au NPs, prepared by a wet chemical method based on the reduction of a gold precursor, were stabilized using a protective layer of citrate anions at the particles' surface, and could be then further modified using a variety of surfactants. Trisodium citrate was used as reducing agent and stabilizer, since it provides a high zeta-potential for the prevention of aggregation of the Au NPs. A series of long chain ionic ammonium salts, imidazolium salts, and nonionic primary amines as exchange surfactants for the initial citrate stabilizer were used in order to multi-dimensionally assemble monodispersed Au NPs. The monodispersed citrate-coated Au NPs exhibit the well-known LSPR band at 520 nm, which undergoes a larger shift for C xImida and ODA aggregates.

Original languageEnglish
Pages (from-to)4027-4032
Number of pages6
JournalAdvanced Materials
Issue number21
Publication statusPublished - 2008 Nov 3
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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