Dialkyl sulfides: novel passivating agents for gold nanoparticles

Elwyn J. Shelley, Declan Ryan, Simon R. Johnson, Martin Couillard, Donald Fitzmaurice, Peter D. Nellist, Yu Chen, Richard E. Palmer, Jon A. Preece

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


Gold nanoparticles passivated with symmetrical and unsymmetrical dialkyl sulfides (H21C10SC10H21 and H37C18SC10H21) have been synthesized via the borohydride reduction of HAuCl4 and characterized by H-1 NMR, FTIR, UV-vis, Auger Electron, XPS spectroscopies, and TEM. Under equivalent conditions of formation, the size and polydispersity of the gold cores obtained was greater for dialkyl sulfide ligands (d(C10SC10) = 5.3 +/- 0.8 nm; d(C18SC10) = 6.3 +/- 1.1 nm) than alkanethiol ligands (d(C10H22SH) = 2.2 +/- 0.1 nm). Edge-edge interparticle spacing of 2-D arrays of the nanoparticles is found to be dependent on the length of the longest alkyl chain passivating the nanoparticles and is independent of the asymmetry of the alkyl chains in the dialkyl sulfide.

Original languageEnglish
Pages (from-to)1791-1795
Number of pages5
Issue number5
Publication statusPublished - 5 Mar 2002


  • self-assembled monolayers
  • heterosupramolecular chemistry
  • nanocrystal superlattices
  • silver
  • adsorption
  • surface
  • AU(111)
  • interdigiation
  • organization
  • alkanethiols


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