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

Zhi Mei Qi, Itaru Honma, Haoshen Zhou

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)1854-1856
Number of pages3
JournalOptics Letters
Volume31
Issue number12
DOIs
Publication statusPublished - 2006 Jun 15
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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