Simple fabrication of metallic colloidal doublets having electrical connectivity

Joseph J. McDermott, Darrell Velegol

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A method is described for fabricating metallic colloidal doublets of gold - gold, silver - silver, and gold - silver. Individual gold and silver spheres of micrometer diameter were synthesized by the aggregation of nanoparticles. Then, by controlling aggregation using ionic strength, yields of doublets above 20% were obtained by the salting-quenching technique. The gold - gold and silver - silver homodoublets were very stable mechanically, even in sonication; the gold - silver heterodoublets were slightly less stable than the homodoublets in sonication. Electrical connectivity between the gold-silver heterodoublets was verified by observing the autoelectrophoresis of gold - silver doublets in 3% hydrogen peroxide solution. The generality of the salting out and quenching technique is demonstrated here, and the finding that the particles are electrically connected will be of great significance in a number of applications.

Original languageEnglish (US)
Pages (from-to)4335-4339
Number of pages5
JournalLangmuir
Volume24
Issue number8
DOIs
StatePublished - Apr 15 2008

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Silver
Gold
silver
gold
Fabrication
fabrication
Sonication
Quenching
Agglomeration
quenching
Gold Colloid
yield strength
Ionic strength
hydrogen peroxide
Hydrogen peroxide
Hydrogen Peroxide
micrometers
Nanoparticles
nanoparticles

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "A method is described for fabricating metallic colloidal doublets of gold - gold, silver - silver, and gold - silver. Individual gold and silver spheres of micrometer diameter were synthesized by the aggregation of nanoparticles. Then, by controlling aggregation using ionic strength, yields of doublets above 20{\%} were obtained by the salting-quenching technique. The gold - gold and silver - silver homodoublets were very stable mechanically, even in sonication; the gold - silver heterodoublets were slightly less stable than the homodoublets in sonication. Electrical connectivity between the gold-silver heterodoublets was verified by observing the autoelectrophoresis of gold - silver doublets in 3{\%} hydrogen peroxide solution. The generality of the salting out and quenching technique is demonstrated here, and the finding that the particles are electrically connected will be of great significance in a number of applications.",
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Simple fabrication of metallic colloidal doublets having electrical connectivity. / McDermott, Joseph J.; Velegol, Darrell.

In: Langmuir, Vol. 24, No. 8, 15.04.2008, p. 4335-4339.

Research output: Contribution to journalArticle

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