Studies on the Preparation and Characterization of Monodisperse Polystyrene Latices. VI. Preparation of Zwitterionic Latices

Ps, Bolt; Goodwin, JW; Rh, Ottewill

doi:10.1021/la058012r

Cited by 17 publications

(23 citation statements)

References 23 publications

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“…. Polystyrene beads were synthesized by surfactant‐free emulsion polymerization . Colloidal monolayers were preassembled at the air/water interface and subsequently transferred to a solid substrate as described in detail in ref.…”

Section: Methodsmentioning

confidence: 99%

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Goerlitzer

Mohammadi

Nechayev

et al. 2019

Advanced Optical Materials

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Chiral plasmonic nanostructures hold promise for enhanced chiral sensing and circular dichroism spectroscopy of chiral molecules. It is therefore of interest to fabricate chiral plasmonic nanostructures with tailored chiroptical properties over large areas with reasonable effort. Here, a colloidal lithography approach is used to produce macroscopic arrays of sub‐micrometer 3D chiral plasmonic crescent structures over areas >1 cm2. The chirality originates from symmetry breaking by the introduction of a step within the crescent structure. This step is produced by an intermediate layer of silicon dioxide onto which the metal crescent structure is deposited. It is experimentally demonstrated that the chiroptical properties in such structures can be tailored by changing the position of the step within the crescent. These experiments are complemented by finite element simulations and the application of a multipole expansion to elucidate the physical origin of the circular dichroism of the crescent structures.

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Section: Methodsmentioning

confidence: 99%

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Goerlitzer

Mohammadi

Nechayev

et al. 2019

Advanced Optical Materials

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“…The difference in the zeta potential of the beads between using the buffer or distilled water as medium of suspension reflects the influence of the sodium cations (M-PVA E02, M-PVA C12) and phosphate anions (M-PVA N12). The influence of the ion concentration on the electrophoretic mobility of particles was already investigated in several studies [20][21][22]. The polarity of the beads was reflected in their respective binding capacities with CALA, which has a negative zeta potential at those immobilisation conditions (Table 1).…”

Section: Immobilisation Of Cala On the Magnetic Microparticlesmentioning

confidence: 99%

Zeta potential measurement as a diagnostic tool in enzyme immobilisation

Schultz

Metreveli

Franzreb³

et al. 2008

Colloids and Surfaces B: Biointerfaces

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“…We deposit titanium (1 nm, HMW Hauner, 99.995%, <3 mm granulate) as an adhesion layer, followed by 20 nm gold (HMW Hauner, 99.99%, <3 mm granulate) on a glass substrate using a custom build thermal evaporator (Torr International Inc., THE3-KW). Polystyrene beads were synthesized by surfactant-free emulsion polymerization . We preassemble the colloidal monolayers at the air/water interface and subsequently transfer them to the solid glass substrate coated with a 20 nm-thick continuous gold film as described in detail in ref .…”

Section: Methodsmentioning

confidence: 99%

Effect of Asymmetry on Plasmon Hybridization and Sensing Capacities of Hole-Disk Arrays

Mohammadi¹,

Ochs

Andrieu‐Brunsen

et al. 2019

J. Phys. Chem. C

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Plasmonic complementary structures are interesting model systems that combine propagating and localized surface plasmon resonances and allow the fundamental study of their hybridization. In the simplest form, such structures are formed by stacking arrays of nanodisks and nanoholes with matching dimensions. Here, we produce such hole-disk arrays in an experimentally easy and parallel colloidal lithography process with accurate control over vertical alignment and separation between the individual disks and holes. Importantly, our process readily enables symmetry breaking and the design of asymmetric hole-disk arrays with controlled lateral offset between each holedisk pair. We investigate the coupling between the parental resonances of the two elements as a function of feature size and separation distance and provide a plasmon hybridization scheme to rationalize the resonances. We find that for the asymmetric hole-disk structure, a new, hybrid resonance arises as a peak in the transmission spectra, which is not found in their symmetric analogues. We demonstrate that this new resonance imparts a higher sensitivity in refractive index sensing as it features a pronounced near-field enhancement in between holes and disks. The near-field structure, paired with the accessibility of this separation region in the presented hole-disk structures, implies that this architecture should be sensitive to local changes in the refractive index at the surface of the dielectric layer separating the plasmonic elements. We demonstrate this sensitivity of the asymmetric hole-disk arrays by the detection of the binding of a silane monolayer at the walls of the dielectric silica spacer layer.

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Studies on the Preparation and Characterization of Monodisperse Polystyrene Latices. VI. Preparation of Zwitterionic Latices

Cited by 17 publications

References 23 publications

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Large‐Area 3D Plasmonic Crescents with Tunable Chirality

Zeta potential measurement as a diagnostic tool in enzyme immobilisation

Effect of Asymmetry on Plasmon Hybridization and Sensing Capacities of Hole-Disk Arrays

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