Deterministic Construction of Plasmonic Heterostructures in Well‐Organized Arrays for Nanophotonic Materials

Li, Xiaoying; Biswas, Shyamal; Jarrett, Jeremy W.; Poutrina, Ekaterina; Urbas, Augustine; Knappenberger, Kenneth L.; Vaia, Richard A.; Nealey, Paul F.

doi:10.1002/adma.201503336

Cited by 35 publications

(42 citation statements)

References 27 publications

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“…The ability to assemble such plasmonic structures on patterned brushes allows for investigating the structure property relations at the single particle level and offers unprecedented capabilities in fabrication of devices. [13][14][15] A variety of different approaches including electronbeam lithography, dip-pen nanolithography and self-assembly has been used to fabricate nanoscale patterns of polymer brushes. [16][17][18][19][20][21][22] Advanced lithography techniques are highly developed and allow for fabrication of polymer brushes with high levels of resolution and fidelity; however, these techniques typically require high capital and operation costs, and not suitable for some of the emerging applications where there is a need for patterning unusual materials and substrates which, for example, are nonplanar and flexible.…”

Section: Abstract: Nanofabrication Polymer Brushes Electrospinningmentioning

confidence: 99%

Assembly of Plasmonic Nanoparticles on Nanopatterns of Polymer Brushes Fabricated by Electrospin Nanolithography

et al. 2017

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This paper presents electrospin nanolithography (ESPNL) for versatile and low-cost fabrication of nanoscale patterns of polymer brushes to serve as templates for assembly of metallic nanoparticles. Here electrospun nanofibers placed on top of a substrate grafted with polymer brushes serve as masks. The oxygen plasma etching of the substrate followed by removal of the fibers leads to linear patterns of polymer brushes. The line-widths as small as ∼50 nm can be achieved by precise tuning of the diameter of fibers, etching condition, and fiber–substrate interaction. Highly aligned and spatially defined patterns can be fabricated by operating in the near-field electrospinning regime. Patterns of polymer brushes with two different chemistries effectively directed the assembly of gold nanoparticles and silver nanocubes. Nanopatterned brushes imparted strong confinement effects on the assembly of plasmonic nanoparticles and resulted in strong localization of electromagnetic fields leading to intense signals in surface-enhanced Raman spectroscopy. The scalability and simplicity of ESPNL hold great promise in patterning of a broad range of polymer thin films for different applications.

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Section: Abstract: Nanofabrication Polymer Brushes Electrospinningmentioning

confidence: 99%

Assembly of Plasmonic Nanoparticles on Nanopatterns of Polymer Brushes Fabricated by Electrospin Nanolithography

et al. 2017

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“…This architecture was fabricated through chemical pattern directed assembly 35 of NDs on a silicon substrate, followed by transfer printing 36 with PDMS as described in Supplementary Note 1. This portable and reusable system allows us to control the position of the NDs with respect to the MSLs and to easily locate and address single nanoparticles, which is critical for performing our measurements.…”

Section: Methodsmentioning

confidence: 99%

Long-range spin wave mediated control of defect qubits in nanodiamonds

et al. 2017

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Hybrid architectures that combine nitrogen-vacancy centers in diamond with other materials and physical systems have been proposed to enhance the nitrogen-vacancy center's capabilities in many quantum sensing and information applications. In particular, spin waves in ferromagnetic materials are a promising candidate to implement these platforms due to their strong magnetic fields, which could be used to efficiently interact with the nitrogen-vacancy centers. Here, we develop an yttrium iron garnet-nanodiamond hybrid architecture constructed with the help of directed assembly and transfer printing techniques. Operating at ambient conditions, we demonstrate that surface confined spin waves excited in the ferromagnet can strongly amplify the interactions between a microwave source and the nitrogen-vacancy centers by enhancing the local microwave magnetic field by several orders of magnitude. Crucially, we show the existence of a regime in which coherent interactions between spin waves and nitrogen-vacancy centers dominate over incoherent mechanisms associated with the broadband magnetic field noise generated by the ferromagnet. These accomplishments enable the spin wave mediated coherent control of spin qubits over distances larger than 200 μm, and allow low power operations for future spintronic technologies.

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“…The resulting structures are extremely interesting with a high‐level of control over the separation distances between the individual NPs; however, inherent challenges exist in the high‐yield generation of such structures over large areas on surfaces of relevant substrates in a dried state that are suitable for device applications. A highly promising strategy that can overcome these challenges is the assembly of heterostructures directly on the surface of substrates by immobilization of colloidal NPs . This strategy has the advantage of direct integration of heterostructures on the relevant substrates from colloidal NPs that are available in massive quantities with precisely defined size, shape, surface roughness and crystallinity.…”

Section: Introductionmentioning

confidence: 99%

“…This strategy has the advantage of direct integration of heterostructures on the relevant substrates from colloidal NPs that are available in massive quantities with precisely defined size, shape, surface roughness and crystallinity. We previously showed that chemical nanopatterns fabricated using electron beam lithography allowed for directed assembly of colloidal gold NPs to fabricate single heterostructures with precise control over their positions. The serial nature of electron beam lithography together with its high cost hinder the use of such substrates in practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Ah ighly promising strategy that can overcome these challenges is the assembly of heterostructures directly on the surface of substrates by immobilization of colloidal NPs. [13,21,22] This strategyh as the advantage of direct integration of heterostructures on the relevant substrates from colloidal NPs that are available in massive quantitiesw ith precisely defined size, shape, surface roughnessa nd crystallinity. We previously [21,23] showedt hat chemical nanopatterns fabricated using electronb eam lithography allowed for directed assembly of colloidalg old NPs to fabricate single heterostructures with precise control over their positions.…”

Section: Introductionmentioning

confidence: 99%

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Modulating the Kinetics of Nanoparticle Adsorption for Simple and High‐Yield Fabrication of Plasmonic Heterostructures as SERS Substrates

et al. 2017

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This work reports scalable, low-cost, and simple fabrication of plasmonic heterostructures consisting of gold nanoparticles (NPs) of different sizes to generate intense hot-pots over large areas to serve as substrates for molecular sensing in SERS applications. Our approach involves assembly of massively-available colloidal gold NPs on substrates functionalized with end-grafted poly(ethylene glycol) (PEG) brushes without need for any sophisticated tools and post-modification of the particles and substrates. From real-time monitoring of the adsorption process by using a quartz crystal microbalance, we identified that the cyclic deposition of citrate-stabilized gold NPs on PEG brushes is an effective approach to modulate the kinetics of particle adsorption and greatly improves the surface coverage leading to reduced inter-particle distances. Cyclic deposition of NPs differing in size leads to placement of the small particles in close proximity of the large ones, yielding hot-spots as a consequence of the unique type of interaction between PEG chains and gold NPs. Assembly of heterostructures (60 nm+40 nm and 60 nm+20 nm) at optimized conditions resulted in strong SERS effects with enhancement factors as high as ≈2.0×10 and enabled detection of rhodamine 6G molecules in concentrations as low as 1 nm. The cyclic deposition of NPs also results in increase of the water contact angle without need for any post-modification of the substrate, resulting in ≈30 fold increase in the Raman intensity of aqueous molecules. The insights gained on the adsorption of gold NPs together with the simplicity of the presented approach show great promise for surface assembly of colloidal NPs for a broad range of applications.

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Deterministic Construction of Plasmonic Heterostructures in Well‐Organized Arrays for Nanophotonic Materials

Cited by 35 publications

References 27 publications

Assembly of Plasmonic Nanoparticles on Nanopatterns of Polymer Brushes Fabricated by Electrospin Nanolithography

Assembly of Plasmonic Nanoparticles on Nanopatterns of Polymer Brushes Fabricated by Electrospin Nanolithography

Long-range spin wave mediated control of defect qubits in nanodiamonds

Modulating the Kinetics of Nanoparticle Adsorption for Simple and High‐Yield Fabrication of Plasmonic Heterostructures as SERS Substrates

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