Directed Chemical Assembly of Single and Clustered Nanoparticles with Silanized Templates

Kinnear, Calum; Cadusch, Jasper; Zhang, Heyou; Lu, Jianing; James, Timothy D.; Roberts, Ann; Mulvaney, Paul

doi:10.1021/acs.langmuir.8b00775

Cited by 24 publications

(34 citation statements)

References 59 publications

(103 reference statements)

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Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

“…The group of Mulvaney utilized e‐beam lithography to create spaced patterns with feature sizes of 80–300 nm. These wells were postmodified by silanization with amines . The resulting attractive interactions between the amine groups and the surface of gold nanoparticles enabled assembly of plasmonic particles by simple immersion into a colloidal dispersion.…”

Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

“…These wells were postmodified by silanization with amines. [97] The resulting attractive interactions between the amine groups and the surface of gold nanoparticles enabled assembly of plasmonic particles by simple immersion into a colloidal dispersion. Due to the sufficiently small features, the deposition of either small clusters or single particles could be obtained.…”

Section: Template-assisted Assemblymentioning

confidence: 99%

Section: Template-assisted Assemblymentioning

confidence: 99%

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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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Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

Section: Template-assisted Assemblymentioning

confidence: 99%

Section: Template-assisted Assemblymentioning

confidence: 99%

See 2 more Smart Citations

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

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“…The surfaces of the gold nanoparticles were functionalized with negatively charged bis( p ‐sulfonatophenyl) phenylphosphine (BSPP) while the surface of the silica substrate was functionalized with positive charges by salinization with aminopropytriethoxysilane. Reproduced with permission . Copyright 2018, American Chemical Society.…”

Section: Directed Assemblymentioning

confidence: 99%

Fabrication of Single‐Nanocrystal Arrays

2019

Self Cite

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two categories. The first is self-assembled, template-based nanofabrication, where a self-assembled superstructure templates the deposition of a nanomaterial. Examples of this include nanosphere lithography for hexagonal structure fabrication, [8] sol-gel structures for creating porous templates, [9] fast pyrolysis for creating hollow structures, [10] and DNA-scaffolding. [11] These template-based processes are widely used due to their simplicity, low fabrication cost, and readily controlled pattern size. However, such methods can often only be used to template a limited range of patterns and offer little control over the final nanomaterial morphology. [6a] The second category we call "arbitrary unit nanofabrication." This refers to any process that is based on a hard template, which is patterned "arbitrarily" using EBL or focused ion beam lithography (FIB). Due to the independent and deterministic fabrication of each unit, arbitrary unit nanofabrication enables the construction of more sophisticated nanostructures than soft-templated processes-in terms of dimensions, morphology, materials, and higher-order structures. Many studies have demonstrated the power of such arbitrary unit-based nanofabrication for applications such as plasmonic coupling, [12] optical and display devices, [13] and sensors. [14] Both of the above nanofabrication strategies (soft template fabrication and lithograph-based fabrication) typically produce templates through which material is deposited via top-down evaporative processes, e.g., physical vapor deposition (PVD). However, such deposition processes offer only a limited range of possible material combinations and there is no control over crystallinity and only poor control over the nanocrystal morphology. The converse is true for nanocrystals synthesized in solution where there is a high degree of control over nanocrystal size, morphology, and crystallinity. Furthermore, complex materials such as core-shell nanocrystals are impossible to make via PVD processes but are easily synthesized chemically. Therefore, combining top-down lithography nanofabrication tools with "bottom-up synthesized" nanocrystals appears to combine the best of both approaches, offering near-endless possibilities for nanofabrication and providing a robust platform for breaking the current bottlenecks in nanomaterials assembly. However, unifying both approaches introduces a range of challenges.In this review, we summarize recent progress in the directed assembly of single nanocrystals. We begin by presenting some recent developments in standard, top-down nanofabrication methods, and then we introduce various directed assembly methods for creating single nanocrystal arrays: capillary force assembly (CFA), electrostatic assembly, optical printing, DNAbased assembly, and electrophoretic deposition (EPD). Of these, the last one has the potential to become a robust, universal method for assembling single nanocrystals directly from solution.To realize the full potential of nanocrystals in nanotechnology, it is necessar...

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Freestanding Photoresist Film: A Versatile Template for Three‐Dimensional Micro‐ and Nanofabrication

Liu

Wathuthanthri

et al. 2020

Adv Funct Materials

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Ultrathin freestanding films with well-defined micro/nanostructures and robust mechanical properties are applied in many engineering applications including microelectronics, optics, filtration and separation, biomedical engineering, and nanotechnology. Although considerable efforts have been made toward the fabrication of freestanding thin films, it is still a significant challenge to develop a simple and reliable process for producing freestanding films with ultrathin thickness, well-regulated micro/nanopatterns, robust mechanical properties, macroscopic coverage area, and multi-layered composite structures. Here, a significant advancement is reported in this regard. This study shows a new sacrificial-layer-free (SLF) lifting-off process, integrated with conventional micro-and nanolithography, enabling the release of micro-and nanopatterned photoresist (PR) films from the supporting substrate with unprecedented pattern coverage and structure characteristics. The freestanding PR film is resilient, can withstand significant bending and deformation, and is sufficiently flexible to be transferred onto substrates with 3D topography as a conformal soft stencil for further technological processing and applications. Moreover, the SLF lifting-off process provides a simple approach to prepare single-layered and multi-layered freestanding composite films. The results suggest that the novel SLF lifting-off process can significantly extend the capability of 3D micro-/nanofabrication.

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Directed Chemical Assembly of Single and Clustered Nanoparticles with Silanized Templates

Cited by 24 publications

References 59 publications

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Fabrication of Single‐Nanocrystal Arrays

Freestanding Photoresist Film: A Versatile Template for Three‐Dimensional Micro‐ and Nanofabrication

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