Absorption spectroscopy of gold nanoisland films

Optical and structural characterization

G. Gupta, D. Tanaka, Y. Ito, D. Shibata, M. Shimojo, K. Furuya, K. Mitsui, K. Kajikawa

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Nanoisland films prepared by annealing thin gold films at high temperatures were imaged using scanning electron microscopy (SEM) and atomic force microscopy, and optically characterized through absorption spectroscopy. Thin gold films of effective thicknesses 2, 5 and 7 nm annealed at 500, 700 and 900°C were fabricated and studied experimentally. The measured absorption characteristics in support of theoretical calculations showed that the shapes of gold islands were partial spheres. The position of the peak absorption wavelength measured with s-polarized light or at normal incidence confirmed that the island shape grew from a near-hemisphere towards a sphere with increasing annealing temperature. The SEM images confirmed that the size of islands increased from 15 nm in diameter to 40 nm in diameter as film thickness increased from 2 to 5 nm. The affect of the index of the substrate material on absorption characteristics were also studied by comparing the absorption spectra of gold island films on quartz and LaSF15 glass substrates. The use of gold nanoisland films for preparing localized surface plasmon resonance substrates was suggested as they held advantages over the gold colloid films.

Original languageEnglish
Article number025703
JournalNanotechnology
Volume20
Issue number2
DOIs
Publication statusPublished - 2009 Jan 14
Externally publishedYes

Fingerprint

Optical films
Absorption spectroscopy
Gold
Substrates
Annealing
Gold Colloid
Scanning electron microscopy
Quartz
Surface plasmon resonance
Light polarization
Colloids
Film thickness
Absorption spectra
Atomic force microscopy
Glass
Wavelength
Temperature

ASJC Scopus subject areas

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

Cite this

Absorption spectroscopy of gold nanoisland films : Optical and structural characterization. / Gupta, G.; Tanaka, D.; Ito, Y.; Shibata, D.; Shimojo, M.; Furuya, K.; Mitsui, K.; Kajikawa, K.

In: Nanotechnology, Vol. 20, No. 2, 025703, 14.01.2009.

Research output: Contribution to journalArticle

Gupta, G, Tanaka, D, Ito, Y, Shibata, D, Shimojo, M, Furuya, K, Mitsui, K & Kajikawa, K 2009, 'Absorption spectroscopy of gold nanoisland films: Optical and structural characterization', Nanotechnology, vol. 20, no. 2, 025703. https://doi.org/10.1088/0957-4484/20/2/025703
Gupta, G. ; Tanaka, D. ; Ito, Y. ; Shibata, D. ; Shimojo, M. ; Furuya, K. ; Mitsui, K. ; Kajikawa, K. / Absorption spectroscopy of gold nanoisland films : Optical and structural characterization. In: Nanotechnology. 2009 ; Vol. 20, No. 2.
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