Enhancing spectral shifts of plasmon-coupled noble metal nanoparticles for sensing applications

Göeken, Kristian; Subramaniam, Vinod; Gill, Ron

doi:10.1039/c4cp03739a

Cited by 41 publications

(55 citation statements)

References 28 publications

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“…This leads to the formation of complexes containing up to ten 40-nm satellites at 0.1 nM target DNA and mostly unbound particles together with a few dimers at ≤0.1 pM target DNA. This was also previously confirmed in the Electronic Supplementary Material (ESM) of our previous paper on this nanoparticle satellite system [39]. In that article, scanning electron microscopy (SEM) was used to demonstrate that the average 80-40 AuNP complex formed at 0.1 nM target DNA has seven 40 nm satellites, whereas only dimers and single nanoparticles are found at 0.1 pM target DNA.…”

Section: Resultssupporting

confidence: 71%

Spermine induced reversible collapse of deoxyribonucleic acid-bridged nanoparticle-based assemblies

et al. 2017

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DNA-linked 2D and 3D nano-assemblies find use in a diverse set of applications, ranging from DNA-origami in drug delivery and medical imaging, to DNA-linked nanoparticle structures for use in plasmonics and (bio)sensing. However, once these structures have been fully assembled, few options are available to modulate structure geometry. Here, we investigated the use of the polycation spermine to induce DNA collapse in small oligonucleotide-linked (54 bp) gold nanoparticle structures by monitoring shifts in the localized surface plasmon resonance (LSPR) peak and by comparing the data with finite-difference time-domain (FDTD) simulations. Our data shows that low concentrations of spermine can be applied to induce large changes in DNA conformation, leading to a significant reduction in interparticle distance (from ~ 25 to ~ 3 nm) and enhanced plasmonic coupling. The DNA collapse is near-instantaneous and reversible, and its application at low and high DNA densities is demonstrated with surface plasmon resonance imaging (SPRi), showing the potential of spermine to dynamically modulate distances and geometry in DNA-based nano-assemblies.

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Section: Resultssupporting

confidence: 71%

Spermine induced reversible collapse of deoxyribonucleic acid-bridged nanoparticle-based assemblies

et al. 2017

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“…This effect is attributed to the oxidation of the silver nanoparticles [13]. A similar result was reported by Goeken et al for silver nanoparticles [14,15].…”

Section: Characterizationsupporting

confidence: 72%

Microstructural and Z-scan measurement of silver nanoparticles

Sivakami

Dhanuskodi

2015

Applied Surface Science

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“…Exploiting the mode energy mismatch in heterodimers calls for techniques that can create narrow interparticle gaps in order to significantly hybridize the eigenmodes of the constituent elements. 16 To this end, colloidal assembly methods have been effective for providing simple access to few nanometer gaps, with techniques varying from capillary assembly 34,35 and electrostatic interactions 16,19,24,36 to DNA linkers 29,37 and origamis. 30,38 A different approach relies on the use of dielectric microbeads for holesphere lithography schemes, combined with tilted evaporation.…”

Section: Resultsmentioning

confidence: 99%

Mode Coupling in Plasmonic Heterodimers Probed with Electron Energy Loss Spectroscopy

et al. 2017

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While plasmonic antennas composed of building blocks made of the same material have been thoroughly studied, recent investigations have highlighted the unique opportunities enabled by making compositionally asymmetric plasmonic systems. So far, mainly heterostructures composed of nanospheres and nanodiscs have been investigated, revealing opportunities for the design of Fano resonant nanostructures, directional scattering, sensing and catalytic applications. In this article, an improved fabrication method is reported that enables precise tuning of the heterodimer geometry, with interparticle distances made down to a few nanometers between Au−Ag and Au−Al nanoparticles. A wide range of mode energy detuning and coupling conditions are observed by near field hyperspectral imaging performed with electron energy loss spectroscopy, supported by full wave analysis numerical simulations. These results provide direct insights into the mode hybridization of plasmonic heterodimers, pointing out the influence of each dimer constituent in the overall electromagnetic response. By relating the coupling of nondipolar modes and plasmon−interband interaction with the dimer geometry, this work facilitates the development of plasmonic heterostructures with tailored responses, beyond the possibilities offered by homodimers. KEYWORDS: optical nanoantennas, plasmonic heterostructures, bimetallic antennas, electron energy loss spectroscopy, electron beam lithography, eigenmodes C ollective oscillations of the conduction electrons in metal nanostructures, known as localized surface plasmon resonances, 1 have been intensively studied and designed by manipulating both the nanostructures size and geometry, as well as their dielectric environment.2 These investigations, carried out over the entire visible light spectrum, including the near-UV and near-IR, have demonstrated the control of both nanoscale optical fields and far field radiation, 1 leading to the concept of optical nanoantennas.2,3 The electromagnetic properties of these structures are governed by their eigenmodes, ranging from dipoles to high order multipoles. 4,5 When the nanoparticles are arranged in pairs or multimers, these modes couple to each other and hybridize, producing further optical properties. 6−8 In the simplest and most common geometry, involving the coupling of two selfsimilar spherical nanoparticles separated by a nanogap, a wellknown dipole−dipole interaction along the dimer axis is produced. 6 This coupling generates an intense and confined near field in the gap region, which can enable large nanoscale fluorescence enhancement 9 and surface enhanced Raman scattering down to the single molecule level. 10,11 Thanks to a complete description of the plasmonic coupling for spherical self-similar nanoparticle dimers, Nordlander and coauthors 7 have shown that the gap dependent hybridization in such nanostructures stems from the interaction of the uncoupled eigenmodes. Specifically, the uncoupled modes hybridize with bonding and antibonding interactions a...

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Enhancing spectral shifts of plasmon-coupled noble metal nanoparticles for sensing applications

Cited by 41 publications

References 28 publications

Spermine induced reversible collapse of deoxyribonucleic acid-bridged nanoparticle-based assemblies

Spermine induced reversible collapse of deoxyribonucleic acid-bridged nanoparticle-based assemblies

Microstructural and Z-scan measurement of silver nanoparticles

Mode Coupling in Plasmonic Heterodimers Probed with Electron Energy Loss Spectroscopy

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