Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films

Guoqian Jiangs, Akira Baba, Hiroshi Ikarashi, Xu Risheng, Jason Locklin, Khan Rana Kashif, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Rigoberto Advincula

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Investigations on optical and dielectric properties of hybrid ultrathin layer-by-layer (LbL) films of gold nanoparticles (AuNPs) and polyelectrolytes under different pH conditions resulted in surface plasmon resonance (SPR) signal enhancement under attenuated total reflection (ATR) spectroscopy conditions. Theoretical considerations on the basis of the Maxwell-Garnett theory were made to compare with experimental results. LbL films with different layer architectures were fabricated from AuNPs and two polyelectrolytes: poly-(allylamine hydrochloride) (PAH) and poly (styrene sulfonate) (PSS) on Au and Ag thin film substrates for ATR. UV-vis spectroscopy and SPR spectroscopy were applied to study LbL film growth and monitor SPR shift upon pH switching. The (PAH/AuNPs)x multilayers showed an interesting dual-responsive SPR change as a function of pH and distance between AuNP layers and metal film. The addition of (PAH/PSS)y layers was found to act as an effective cushion to enhance this SPR response due to the significant swelling/shrinking of the film. In the case of [(PAH/PSS)y + (PAH/AuNPs)x], both theoretical calculations and experimental results showed that the SPR response can either (a) move toward lower incident angle with a sharp peak shape upon swelling in pH = 2 or (b) shift to a higher angle with a broadened peak shape after contraction in pH = 10. This effect was found to be opposite to what is expected from LbL films made up of the polyelectrolytes alone. Moreover, increasing the distance between AuNPs and the metal films also decouples this enhancement effect. A two-wavelength experiment (red and green lasers) was used to quantitatively demonstrate this SPR response to pH switching. Finally, SPR imaging was employed to monitor the SPR change with pH switching between 2 and 10 on the [(PAH/PSS)4 + (PAH/AuNPs)2] film. Thus, on the basis of the SPR spectroscopic and SPR imaging pH response, a reproducible and stable sensing system can be successfully fabricated with these films.

Original languageEnglish
Pages (from-to)18687-18694
Number of pages8
JournalJournal of Physical Chemistry C
Volume111
Issue number50
DOIs
Publication statusPublished - 2007 Dec 20
Externally publishedYes

Fingerprint

Ultrathin films
Surface plasmon resonance
Polyelectrolytes
surface plasmon resonance
polycyclic aromatic hydrocarbons
Polycyclic aromatic hydrocarbons
Tuning
tuning
Nanoparticles
nanoparticles
augmentation
Styrene
sulfonates
polystyrene
metal films
swelling
Swelling
Metals
Spectroscopy
spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Jiangs, G., Baba, A., Ikarashi, H., Risheng, X., Locklin, J., Kashif, K. R., ... Advincula, R. (2007). Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films. Journal of Physical Chemistry C, 111(50), 18687-18694. https://doi.org/10.1021/jp075986e

Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films. / Jiangs, Guoqian; Baba, Akira; Ikarashi, Hiroshi; Risheng, Xu; Locklin, Jason; Kashif, Khan Rana; Shinbo, Kazunari; Kato, Keizo; Kaneko, Futao; Advincula, Rigoberto.

In: Journal of Physical Chemistry C, Vol. 111, No. 50, 20.12.2007, p. 18687-18694.

Research output: Contribution to journalArticle

Jiangs, G, Baba, A, Ikarashi, H, Risheng, X, Locklin, J, Kashif, KR, Shinbo, K, Kato, K, Kaneko, F & Advincula, R 2007, 'Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films', Journal of Physical Chemistry C, vol. 111, no. 50, pp. 18687-18694. https://doi.org/10.1021/jp075986e
Jiangs, Guoqian ; Baba, Akira ; Ikarashi, Hiroshi ; Risheng, Xu ; Locklin, Jason ; Kashif, Khan Rana ; Shinbo, Kazunari ; Kato, Keizo ; Kaneko, Futao ; Advincula, Rigoberto. / Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 50. pp. 18687-18694.
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