Response of surface-plasmon resonance sensor based on gold surfaces modified by self-assembled monolayer to nonionic surfactants

Takashi Masadome, Yoshinori Yano

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A chemical sensor for the determination of nonionic surfactants (NISs) based on surface-plasmon resonance (SPR) phenomenon was fabricated using a gold thin film, the surface of which was modified with a self-assembled monolayer (SAM). Stearylmercaptan was used for the SAM constituent. The magnitude of the angle shift of SPR sensor to NISs increases in this order: Triton X-100 < heptaethyleneglycol dodecyl ether (HEEG) < hexaethyleneglycol dodecyl ether (HEG) < pentaethyleneglycol dodecyl ether (PEG). This order of magnitude of angle shift is in accord with the sequence of the hydrophobicity of the NISs. The linear relationships between Δθ (the change in the resonance angle relative to the baseline value) and the concentration of NISs were obtained in the concentration range from 2 × 10 -6 M to 1 × 10 -5 M. The coexistence of common inorganic cations and anions at 100 times excess to the Triton X-100 gives only a positive error less than ca. +5%. The coexistence of an anionic surfactant (sodium dodecylbenzene sulfonate) at 10 times excess to the Triton X-100 gives a very serious positive error of ca. +320%. This serious positive error was completely eliminated by using the flow system with an anion-exchange resin column.

Original languageEnglish
Pages (from-to)2169-2177
Number of pages9
JournalAnalytical Letters
Volume39
Issue number10
DOIs
Publication statusPublished - 2006 Aug 1

Fingerprint

Nonionic surfactants
Surface plasmon resonance
Self assembled monolayers
Gold
Octoxynol
Ether
Ethers
Sensors
Negative ions
Anion Exchange Resins
Anionic surfactants
Hydrophobicity
Chemical sensors
Polyethylene glycols
Anions
Cations
Ion exchange
Resins
Positive ions
Sodium

Keywords

  • Nonionic surfactant
  • Self-assembled monolayer
  • Stearylmercaptan
  • Surface-plasmon resonance sensor

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Response of surface-plasmon resonance sensor based on gold surfaces modified by self-assembled monolayer to nonionic surfactants. / Masadome, Takashi; Yano, Yoshinori.

In: Analytical Letters, Vol. 39, No. 10, 01.08.2006, p. 2169-2177.

Research output: Contribution to journalArticle

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