Tunable plasmonic surfaces via colloid assembly

Honold, Tobias; Volk, Kirsten; Rauh, Astrid; Fitzgerald, J.P.S.; Karg, Matthias

doi:10.1039/c5tc02115d

Cited by 51 publications

(82 citation statements)

References 56 publications

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“…In a second step we used a seeded growth protocol to overgrow the gold cores in-situ. [12] Overgrowth of the gold cores by gold yielded Au@Au-PNIPAM and overgrowth with silver Ag@Au-PNIPAM core-shell particles, respectively. The morphology of these particles is schematically depicted in figure 1.…”

Section: Plasmonic Building Blocks For Interface-mediated Self-assemblymentioning

confidence: 99%

“…[12] Similarly, we used core-shell colloids with hydrogel shells composed of chemically crosslinked poly-N-isopropylacrylamide (PNIPAM) is this work. The particles were prepared in two steps: In a first step spherical gold nanoparticles of approximately 14 nm in diameter were encapsulated in PNIPAM by free radical precipitation polymerization yielding Au-PNIPAM core shell particles.…”

Section: Plasmonic Building Blocks For Interface-mediated Self-assemblymentioning

confidence: 99%

“…The overgrowth of the cores was done by surfactant assisted seed-mediated protocols as described recently. [12] The final diameter of the overgrown metal cores were 75 nm and 99 nm, for Au@Au-PNIPAM and Ag@Au-PNIPAM respectively. The obtained aqueous colloidal dispersions were centrifuged at 2400 rcf for 45 min until the supernatant was completely colorless.…”

Section: Particle Synthesismentioning

confidence: 99%

“…This method has proven to be a versatile approach for the preparation of hexagonally ordered colloidal monolayers that can be transferred onto solid supports maintaining a high degree of order. [12][13][14]16] Figure 2 A and B show TEM images of monolayers of the Au@Au-PNIPAM (A) and Ag@Au-PNIPAM (B) particles that were transferred from the air/water interface to a TEM grid by simply withdrawing the grid through the freely-floating monolayer at the interface. The detailed experimental description of this procedure can be found in the Experimental Section (3.).…”

Section: Monolayer Fabrication By Interface-mediated Self-assemblymentioning

confidence: 99%

“…In a previous work, Honold et al have shown that the interface-mediated colloidal self-assembly of metal-hydrogel core-shell particles with gold and silver cores can be used to fabricate highly ordered non-close packed monolayers on cm-scale supports. [12] The inter-particle distances in these hexagonal lattices were in the order of 460 nm. Later, Volk et al have shown that the inter-particle distance in such lattices can be easily tuned by changing the dwell-time of the metal-hydrogel core-shell particle monolayer assembled at the air/water interface.…”

Section: Introductionmentioning

confidence: 99%

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Section: Plasmonic Building Blocks For Interface-mediated Self-assemblymentioning

confidence: 99%

Section: Plasmonic Building Blocks For Interface-mediated Self-assemblymentioning

confidence: 99%

Section: Particle Synthesismentioning

confidence: 99%

Section: Monolayer Fabrication By Interface-mediated Self-assemblymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Binary plasmonic honeycomb structures: High-resolution EDX mapping and optical properties

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Design of Nanostructured Surfaces Based on Metal NP Precipitation Strategy and their Catalytic Application

Guarrotxena

Garrido

Quijada‐Garrido

2018

Adv Materials Inter

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the MNP arrangement in an organized manner will prevent possible agglomerations, often observed in MNPs with the subsequent loss of functional properties. In this regard, the reversible temperature-induced coil-globule transition in water experienced by thermoresponsive polymers, such as poly(N-isopropylacrylamide) p(NIPAM), causes the polymer shrink above the lower critical solution temperature (LCST). This feature can be exploited for the generation of 2D and 3D nanoparticle arrays. [1-3,6,8a,9] In this case, the polymer shell is used to control the gap between the particles, avoiding direct contact among metallic cores and, in addition, guiding the self-assemble. Furthermore, the hydrophobic p(NIPAM) coating can trap hydrophobic analytes close to the Au NPs surface, amplifying the Raman signal, [3] and making them attractive materials for sensing applications. In this work, we investigate the MNPs coating with poly(2-(2-methoxyethoxy)ethyl methacrylate) p(MEO 2 MA), a thermoresponsive polymer, based on lateral chains of oligoethylene glycol, which exhibits a LCST around 26 °C. We demonstrate that setting the temperature close to the collapsing temperature of the thermoresponsive polymers, based on MEO 2 MA and a thiolated comonomer, is a simple strategy to attain the controlled precipitation of MNPs on a microstructured polymer surface (Scheme 1) consisting on well-aligned electrospun fibers of a biodegradable polymer with high plasmonic specific area.The arrangement of plasmonic NPs may find application for sensing, [10] and, the aligned metal NP-fiber, as scaffolds, for neural cells; since fibers coated with gold NPs can guide the neurite outgrowth. [7b] Nevertheless, another interesting property of noble metal NPs is their catalytic activity. Indeed, despite the widespread use of colloidal noble metal NPs in catalysis, [11] the extraordinary catalytic activity of pristine MNPs is often hampered due to their tendency to aggregate during the catalytic reaction, reducing their activity and preventing their reutilization. For this reason, to avoid the aggregation of the particles during catalysis and facilitate their recovery and reutilization, the use of coatings [11b,c,12] and supports [13] are strategies frequently used. Taken this into consideration, we propose a noble metal@polymer@fiber nanocomposite with the MNPs just on the surface of microfiber mats to take advantage of the mats' high surface area and their feasibility to be used for several cycles. In this work, the reduction of 4-nitrophenol in water with gold@polymer@fiber nanocomposite has been studied The fabrication of functional surfaces based on arrangements of metallic nanoparticles (MNPs) is challenging for biomedical, optoelectronic, and catalytic applications. Herein, the fabrication of 3D nanostructured microfibers is reported by the controlled cooperative precipitation of MNPs on electrospun polymer fiber mats, at the critical solution temperature of a thermoresponsive copolymer coating the MNPs surface. To obtain the metallic decorat...

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Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

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Noble metal nanoparticles can absorb incident light very efficiently due to their ability to support localized surface plasmon resonances (LSPRs), collective oscillations of the free electron cloud. LSPRs lead to strong, nanoscale confinement of electromagnetic energy which facilitates applications in many fields including sensing, photonics, or catalysis. In these applications, damping of the LSPR caused by inter‐ and intraband transitions is a limiting factor due to the associated energy losses and line broadening. The losses and broad linewidth can be mitigated by arranging the particles into periodic lattices. Recent advances in particle synthesis, (self‐)assembly, and fabrication techniques allow for the realization of collective coupling effects building on various particle sizes, geometries, and compositions. Beyond assemblies on static substrates, by assembling or printing on mechanically deformable surfaces a modulation of the lattice periodicity is possible. This enables significant alteration and tuning of the optical properties. This progress report focuses on this novel approach for tunable spectroscopic properties with a particular focus on low‐cost and large‐area fabrication techniques for functional plasmonic lattices. The report concludes with a discussion of the perspectives for expanding the mechanotunable colloidal concept to responsive structures and flexible devices.

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Tunable plasmonic surfaces via colloid assembly

Abstract: Homogeneous, cm-scale, plasmonic monolayers with defined plasmon resonance positions and intensities are fabricated by interface assembly of core–shell colloids.

Cited by 51 publications

References 56 publications

Binary plasmonic honeycomb structures: High-resolution EDX mapping and optical properties

Binary plasmonic honeycomb structures: High-resolution EDX mapping and optical properties

Design of Nanostructured Surfaces Based on Metal NP Precipitation Strategy and their Catalytic Application

Mechanotunable Plasmonic Properties of Colloidal Assemblies

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