Localized surface plasmon resonance coupling in Au nanoparticles/phosphorus dendrimer multilayer thin films fabricated by layer-by-layer self-assembly method

Zhao, Wen; Park, Jeongju; Caminade, Anne‐Marie; Jeong, Seong Jun; Jang, Yoon Hee; Kim, Sang Ouk; Majoral, Jean Pierre; Cho, Jinhan; Kim, Dong Ha

doi:10.1039/b814116a

Cited by 43 publications

(27 citation statements)

References 46 publications

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“…4 Corn and coworkers realised 10 fM detection by a combination of poly(A) enzyme chemistry and nanoparticle-amplified SPR imaging. 5 However, the signal enhancement by employing AuNPs can be caused by different factors: [4][5][6][7][8][9][10][11][12] (1) surface mass increase due to AuNPs and more molecules being attached to the AuNPs than the planar gold surface; (2) refractive index change by the particles; (3) electromagnetic field coupling between SPR and localised SPR (LSPR). Among these factors, the coupling effect has been expected to play a dominant role.…”

Section: Introductionmentioning

confidence: 99%

“…Many approaches have been explored, such as use of fluorescence, 1 modifying the sensor chip with particles, 2,3 performing a labelled assay using large particles, etc. [4][5][6] Among these, the use of gold nanoparticles (AuNPs) [7][8][9][10][11][12] for signal amplification has obtained significantly improved sensitivity. For example, He et al reported the sandwich approach to detect DNA hybridisation.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of gold nanoparticles to the signal amplification in surface plasmon resonance

Hong

Hall

2012

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Gold nanoparticle labelling has been shown to produce a remarkable improvement in sensitivity for small molecule detection based on Surface Plasmon Resonance (SPR) bio-sensing. The LSPR (localised SPR)-SPR coupling effect and size/mass-material properties associated with gold nanoparticles are the two main factors to change the SPR resonance condition and cause the enhancement. In this paper we examine the separation of these factors in the context of a classical SPR bio-interaction assay format, and consider the implications on the design of biodetection systems to maximise response. The coupling effect plays a distance dependent role, which allows it to be mapped. The dominant enhancement associated with this factor only occurs within ∼8 nm for a 20 nm gold nanoparticle and is changing by ∼7 nm wavelength shift/nm distance from the Au SPR thin film. Beyond this distance, the size/mass associated with the nanoparticle itself dominates the enhancement. This is demonstrated in a 20-mer DNA sequence sandwich detection, where the enhancement ratio between the coupling effect and the mass is ∼1.5 : 1. This simple method for deconvolution of the mass and coupling effects allows consideration of formats with LSPR nanoparticle labelling for small molecule detection and the best design of the labelling geometry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contribution of gold nanoparticles to the signal amplification in surface plasmon resonance

Hong

Hall

2012

Analyst

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“…Using the thiolate ligation chemistry, the Au NPs can be functionalized with redox moieties to produce interesting multielectron reactivities. 7-10 Films on planar substrates based on metal nanoparticles as building blocks have attracted substantial interest for their optical, electrical [11][12][13] and stability 14 properties. Applications of Au NP films in chemiresistors and in biological sensing have been reported by various groups.…”

Section: Introductionmentioning

confidence: 99%

Persistent Multilayer Electrode Adsorption of Polycationic Au Nanoparticles

et al. 2010

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Multilayers of mixed monolayer thiolate-protected Au nanoparticles with polycationic ligand shells are strongly and persistently adsorbed on Pt electrodes from dilute CH 3 CN/electrolyte solutions of the nanoparticles. The adsorption is so robust that the electrodes can be transferred, with rinsing, to nanoparticle-free CH 3 CN/ electrolyte (and other organic solvents) and their voltammetry observed without significant desorption. The nanoparticles have the average composition [Au 225 (TEA-thiolateThe cation sites are a quaternary ammonium-terminated ligand (TEA-thiolate + ) -S(CH 2 ) 11 N(CH 2 CH 3 ) 3 + ). The ferrocene content of the ligand shell (Y) allows voltammetric detection of the adsorption, and also affects it. This work describes how the extent of nanoparticle adsorption (surface coverage, Γ NP mol/cm 2 ) depends on the manner of exposure of the electrode (with potential scanning, at a fixed potential, or at open circuit) to the nanoparticle solution, and on the nanoparticle concentration, the electrolyte and its concentration, and on the mixed monolayer composition. Increase of the cationic TEA-thiolate + component of the mixed monolayer from X ) 18 to 27 increases, for a given exposure mode, the attained amount of adsorption from < one monolayer to > two monolayers, and broadens the voltammetric wave. The adsorption phenomenon is interpreted as induced by multiple ion-pair bridges between cation sites and electrolyte anions, and as such represents an entropic consequence of multiple interactions between nanoparticles and between nanoparticles and the electrode.

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“…After the pioneering works on the preparation of Au thin films [1,2], numerous other methods were developed involving techniques such as electrostatic controlled assembly [40], layer-bylayer assembly [16,41,42], interfacial entrapment [43], micromolding lithography [44], and centrifugal force-aided deposition [45]. In this study, the mixtures consisting of hybridized Au NPs and isolated copolymer micelles were spin-coated onto solid substrates to fabricate composite Au thin films.…”

Section: Fabricating Au Thin Films By Spin-coatingmentioning

confidence: 99%

“…First, Au thin films fabricated by alkylthiol-functionalized Au NPs were found to have vapor sensitive conductivities [7,8], they were hence widely investigated as electrical chemiresistors for sensing different vapor analytes [9][10][11] and even organic molecules in aqueous solutions [12,13]. Second, Au thin films were demonstrated to have special localized surface plasmon resonances (LSPR) [14][15][16], so that highly ordered 2D Au superlattices showed strong collective LSPR bands due to the near-field coupling of adjacent nanoparticles [17] and were employed to detect biomolecular binding [18]. Third, they were considered as crucial substrates for surface-enhanced Raman scattering [19][20][21][22][23] with stable and reproducible enhancement factors of 10 5 -10 7 [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Responsive polymer/gold nanoparticle composite thin films fabricated by solvent-induced self-assembly and spin-coating

Lee²,

Kim

2011

Journal of Colloid and Interface Science

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Localized surface plasmon resonance coupling in Au nanoparticles/phosphorus dendrimer multilayer thin films fabricated by layer-by-layer self-assembly method

Cited by 43 publications

References 46 publications

Contribution of gold nanoparticles to the signal amplification in surface plasmon resonance

Contribution of gold nanoparticles to the signal amplification in surface plasmon resonance

Persistent Multilayer Electrode Adsorption of Polycationic Au Nanoparticles

Responsive polymer/gold nanoparticle composite thin films fabricated by solvent-induced self-assembly and spin-coating

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