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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 7 — Jul. 17, 2006

Humidity sensor based on localized surface plasmon resonance of multilayer thin films of gold nanoparticles linked with myoglobin

Zhi-mei Qi, Itaru Honma, and Haoshen Zhou  »View Author Affiliations


Optics Letters, Vol. 31, Issue 12, pp. 1854-1856 (2006)
http://dx.doi.org/10.1364/OL.31.001854


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Abstract

Layer-by-layer self-assembled multilayer thin films of gold nanoparticles (GNPs) linked with myoglobin (Mb) show substantial sensitivity to humidity at room temperature according to measurements of localized surface plasmon resonance (LSPR) absorption that relies on the interparticle interaction present in the film. The sensor response is reversible, with response and recovery times as low as 5 ‚ÄČ s . The sensing mechanism is as follows: as the ambient humidity changes, Mb molecules change their size, making the GNP-to-GNP spacing and thereby the interparticle interaction change; the change in the interparticle interaction causes a change in the LSPR absorption of the multilayer thin film. We found that the LSPR band of the multilayer thin film was almost insensitive to both the surrounding refractive index and the adlayer thickness, rendering the multilayer-film-based humidity sensor highly immune to ambient disturbances.

© 2006 Optical Society of America

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(300.1030) Spectroscopy : Absorption
(310.6860) Thin films : Thin films, optical properties
(350.4990) Other areas of optics : Particles

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: March 2, 2006
Revised Manuscript: April 11, 2006
Manuscript Accepted: April 11, 2006

Virtual Issues
Vol. 1, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Zhi-mei Qi, Itaru Honma, and Haoshen Zhou, "Humidity sensor based on localized surface plasmon resonance of multilayer thin films of gold nanoparticles linked with myoglobin," Opt. Lett. 31, 1854-1856 (2006)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-31-12-1854

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