Attachment of gold nanoparticles onto indium tin oxide surfaces controlled by adding citrate ions in a seed-mediated growth method

Ali Umar Akrajas, Munetaka Oyama

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A simple approach to control the attachment of gold nanoparticles (AuNPs) onto the indium tin oxide (ITO) surfaces is reported. Adjusting the concentration of trisodium citrate in the Au colloid solution for the seeding process from 1 to 50 mM in the seed-mediated growth method, the dramatic changes in the SEM images and actual color were observed indicating the changes in nanostructures of AuNPs formed on the ITO surfaces. Whereas the attachment of smaller AuNPs with higher density were observed when 25 mM citrate ions were added in the seed solution, larger AuNPs were observed to attach at 50 mM. On the basis of this difference and the surface SEM images observed just after seeding, the roles of citrate ions were discussed. Consequently, it was inferred that the citrate ions affected the growth process as well as the seeding process. The repulsive power expected from the increased negative charges of citrate ions were not significant, but rather the dense attachment was promoted as the peculiar effect of citrate ions. Such control of the AuNPs attachment on ITO would be practically effective because the dense attachment can be performed by just changing the composition of the seed solution.

Original languageEnglish
Pages (from-to)2933-2940
Number of pages8
JournalApplied Surface Science
Volume253
Issue number5
DOIs
Publication statusPublished - 30 Dec 2006
Externally publishedYes

Fingerprint

citrates
Tin oxides
Citric Acid
Gold
indium oxides
Indium
tin oxides
attachment
Seed
seeds
Ions
gold
Nanoparticles
nanoparticles
inoculation
ions
Scanning electron microscopy
Colloids
scanning electron microscopy
Nanostructures

Keywords

  • Citrate ions
  • Controlled attachment
  • Gold nanoparticles
  • Indium tin oxides
  • Seed-mediated growth
  • Surface modification

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Attachment of gold nanoparticles onto indium tin oxide surfaces controlled by adding citrate ions in a seed-mediated growth method. / Akrajas, Ali Umar; Oyama, Munetaka.

In: Applied Surface Science, Vol. 253, No. 5, 30.12.2006, p. 2933-2940.

Research output: Contribution to journalArticle

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