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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 33, Iss. 8 — Apr. 15, 2008
  • pp: 806–808

Matrix effects on the surface plasmon resonance of dry supported gold nanocrystals

Cyrill Kuemin, Tobias Kraus, Heiko Wolf, and Nicholas D. Spencer  »View Author Affiliations


Optics Letters, Vol. 33, Issue 8, pp. 806-808 (2008)
http://dx.doi.org/10.1364/OL.33.000806


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Abstract

We present a method to characterize surface-chemical properties of gold nanocrystals. Spherical, 60 nm gold nanocrystals were immobilized on quartz substrates by a coupling agent and cleaned in a hydrogen plasma. The nanocrystals were then functionalized with alkanethiol self-assembled monolayers (SAM) of varying chain lengths by adsorption from the gas phase, and localized surface plasmon resonance (LSPR) spectroscopy was performed on the samples. Depending on the alkanethiol chain length, the adsorption of the SAM redshifted the LSPR to different extents, in accordance with Mie theory. SAM thickness differences below 1 nm could be easily resolved. Our results demonstrate that LSPR spectroscopy can be applied to characterize thin organic layers on dry supported gold particles with high sensitivity.

© 2008 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(240.6680) Optics at surfaces : Surface plasmons
(300.6490) Spectroscopy : Spectroscopy, surface
(350.4990) Other areas of optics : Particles

ToC Category:
Spectroscopy

History
Original Manuscript: November 30, 2007
Revised Manuscript: February 29, 2008
Manuscript Accepted: March 7, 2008
Published: April 10, 2008

Virtual Issues
Vol. 3, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Cyrill Kuemin, Tobias Kraus, Heiko Wolf, and Nicholas D. Spencer, "Matrix effects on the surface plasmon resonance of dry supported gold nanocrystals," Opt. Lett. 33, 806-808 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-8-806


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