Growth of textured thin Au coatings on iron oxide nanoparticles with near infrared absorbance

L. L. Ma, A. U. Borwankar, B. W. Willsey, K. Y. Yoon, J. O. Tam, K. V. Sokolov, Marc D Feldman, T. E. Milner, K. P. Johnston

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A homologous series of Au coated iron oxide nanoparticles with hydrodynamic diameters smaller than 60 nm was synthesized with very low Au-to-iron mass ratios, as low as 0.15. The hydrodynamic diameter was determined by dynamic light scattering and the composition by atomic absorption spectroscopy and energy dispersive x-ray spectroscopy. Unusually low Au precursor supersaturation levels were utilized to nucleate and grow Au coatings on iron oxide relative to the formation of pure Au nanoparticles. This approach produced unusually thin coatings by lowering autocatalytic growth of Au on Au, as shown by transmission electron microscopy. Nearly all of the nanoparticles were attracted by a magnet, indicating a minimal number of pure Au particles. The coatings were sufficiently thin to shift the surface plasmon resonance to the near infrared with large extinction coefficients, despite the small particle hydrodynamic diameters observed from dynamic light scattering to be less than 60 nm.

Original languageEnglish (US)
Article number025606
JournalNanotechnology
Volume24
Issue number2
DOIs
StatePublished - Jan 18 2013

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Iron oxides
Hydrodynamics
Dynamic light scattering
Nanoparticles
Infrared radiation
Coatings
Light extinction
Atomic spectroscopy
Supersaturation
Surface plasmon resonance
Absorption spectroscopy
Magnets
Iron
Spectroscopy
Transmission electron microscopy
X rays
Chemical analysis
ferric oxide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Ma, L. L., Borwankar, A. U., Willsey, B. W., Yoon, K. Y., Tam, J. O., Sokolov, K. V., ... Johnston, K. P. (2013). Growth of textured thin Au coatings on iron oxide nanoparticles with near infrared absorbance. Nanotechnology, 24(2), [025606]. https://doi.org/10.1088/0957-4484/24/2/025606

Growth of textured thin Au coatings on iron oxide nanoparticles with near infrared absorbance. / Ma, L. L.; Borwankar, A. U.; Willsey, B. W.; Yoon, K. Y.; Tam, J. O.; Sokolov, K. V.; Feldman, Marc D; Milner, T. E.; Johnston, K. P.

In: Nanotechnology, Vol. 24, No. 2, 025606, 18.01.2013.

Research output: Contribution to journalArticle

Ma, LL, Borwankar, AU, Willsey, BW, Yoon, KY, Tam, JO, Sokolov, KV, Feldman, MD, Milner, TE & Johnston, KP 2013, 'Growth of textured thin Au coatings on iron oxide nanoparticles with near infrared absorbance', Nanotechnology, vol. 24, no. 2, 025606. https://doi.org/10.1088/0957-4484/24/2/025606
Ma, L. L. ; Borwankar, A. U. ; Willsey, B. W. ; Yoon, K. Y. ; Tam, J. O. ; Sokolov, K. V. ; Feldman, Marc D ; Milner, T. E. ; Johnston, K. P. / Growth of textured thin Au coatings on iron oxide nanoparticles with near infrared absorbance. In: Nanotechnology. 2013 ; Vol. 24, No. 2.
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