Approaches to self-assembly of colloidal monolayers: A guide for nanotechnologists

Lotito, Valeria; Zambelli, Tomaso

doi:10.1016/j.cis.2017.04.003

Cited by 173 publications

(175 citation statements)

References 571 publications

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“…Adsorbed at the interface, colloids are subject to long‐range attractive and short‐range repulsive interparticle interactions. The interplay between these leads to the formation of ordered hexagonal lattices that can subsequently be transferred onto solid supports . At liquid/liquid interfaces, the repulsive interactions typically outweigh the attractive ones, resulting in non‐close‐packed layers of particles .…”

Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

“…The interplay between these leads to the formation of ordered hexagonal lattices that can subsequently be transferred onto solid supports. [56,57] At liquid/liquid interfaces, the repulsive interactions typically outweigh the attractive ones, resulting in non-close-packed layers of particles. [58][59][60][61] At air/liquid interfaces, on the other hand, the attractive interactions, notably capillary forces, are typically dominating and lead to close-packed arrays.…”

Section: Interface-mediated 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: Interface-mediated Assemblymentioning

confidence: 99%

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Flotation processes also involve conditions in which the liquid fraction is small. New, emerging technologies aim to assemble colloids straddling the surface of a liquid film on a solid support into well-packed or even crystalline domains, or into programmed assemblies to be used as coatings (superhydrophobic or antireflection), templates for the materials fabrication of micro and nano-structured materials, photonic crystals and for optoelectronic devices 4,5 . In these technologies, thin liquid films containing suspensions of colloids are spread onto a solid substrate; as the colloids adsorb onto the surface, the subsequent evaporation of the film draws the colloids together by capillary forces to create assembled structures.…”

Section: Introductionmentioning

confidence: 99%

The Translational and Rotational Dynamics of a Colloid Moving Along the Air-Liquid Interface of a Thin Film

Das

Koplik

Farinato

et al. 2018

Sci Rep

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This study examines the translation and rotation of a spherical colloid straddling the (upper) air/liquid interface of a thin, planar, liquid film bounded from below by either a solid or a gas/liquid interface. The goal is to obtain numerical solutions for the hydrodynamic flow in order to understand the influence of the film thickness and the lower interface boundary condition. When the colloid translates on a film above a solid, the viscous resistance increases significantly as the film thickness decreases due to the fluid-solid interaction, while on a free lamella, the drag decreases due to the proximity to the free (gas/liquid) surface. When the colloid rotates, the contact line of the interface moves relative to the colloid surface. If no-slip is assumed, the stress becomes infinite and prevents the rotation. Here finite slip is used to resolve the singularity, and for small values of the slip coefficient, the rotational viscous resistance is dominated by the contact line stress and is surprisingly less dependent on the film thickness and the lower interface boundary condition. For a colloid rotating on a semi-infinite liquid layer, the rotational resistance is largest when the colloid just breaches the interface from the liquid side.

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“…[2] However, the scarcity of indium and brittleness of the ceramic ITO, in increasing the scalability of Langmuir-Blodgett methods to feasible production levels is understandably beginning to emerge. [18] However, one significant weakness of liquid-based film fabrication is still the lack of in situ characterization. [18] However, one significant weakness of liquid-based film fabrication is still the lack of in situ characterization.…”

Section: Introductionmentioning

confidence: 99%

“…[16,17] Especially promising is the potential use of a wider range of substrates, due to a reduced (or in-)dependence of the structure of the interfacial layer on substrate properties (chemical homogeneity, flatness, wettability). [18] However, one significant weakness of liquid-based film fabrication is still the lack of in situ characterization. While Brewster angle microscopy (BAM) can be applied to visualize the film state, [19] besides this, optical assessment characterization of film properties is generally carried out only after coating of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Electrically Conductive Thin Films Derived from Bulk Graphite and Liquid–Liquid Interface Assembly

Blair

Çelebi

Müllen

et al. 2018

Adv Materials Inter

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combined with its production by expensive vapor processing methods define an urgent need for alternative materials. One possible alternative material for this is graphene, [3] a 2D allotrope of carbon first described in 2004. [4] Composed of a single layer of carbon atoms, graphene offers high mechanical strength, chemical resistance, and thermal and electrical conductivity while maintaining high optical transparency. [5] What remains a challenge, however, is its exfoliation from bulk graphite in scalable quantity such that applications no longer rely upon expensive bottom-up growth methods such as chemical vapor deposition. [6] Liquid-phase exfoliation of cheap and plentiful bulk graphite provides a low-cost exfoliation method with reported yields typi cally ranging from less than 1% up to 10% by mass of single-or few-layer graphene in organic solvents. [7][8][9][10] Graphite exfoliation by oxidation to nonconductive graphene oxide (GO), followed by reduction to restore sp 2 conjugation in the material, has the benefit of readily producing single sheets of GO in aqueous dispersion. Subsequent reduction, however, is only partial and often accompanied by significant loss of mass of the GO, resulting in compromised electrical and mechanical properties. [11][12][13] Therefore, a method of directly exfoliating bulk graphite to graphene using a very mild electrochemical oxidation [8,14] has the best potential for high yield and good electrical quality. Moreover, a liquid dispersion provides the optimal starting point for fabrication of graphene films prepared using liquid-based film processing techniques.Langmuir-Blodgett deposition is one such technique, capable of fabricating monolayer or multilayer films with well-ordered structures templated on the liquid interface and then transferred to a substrate of choice. Structural control stems from manipulation of the surface pressure of the interfacial material by compression with mechanical barriers, before the substrate is raised or lowered through the interface. Knowledge of the 2D phase behavior and compression state of the material is an important prerequisite for depositing a film with controlled properties. Applicable to a wide range of interfacial systems, it has long been a standard laboratory-scale technique to coat appropriate substrates, including flexible ones, for further analysis and characterization of interfacial films. [15] The combination of low cost and environmental impact with the efficiency of material transfer from the interface to the substrate has meant that interest Confinement of particles to fluid-fluid interfaces provides a unique interaction environment, allowing the directed assembly of particles using lateral capillary forces. The particle laden interfacial layers can be deposited onto a variety of substrates for the fabrication of thin film coatings, designed to have structural or functional properties resulting from the interfacespecific structures. For the fabrication of electrically conducting films and specifically graphene-based co...

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Approaches to self-assembly of colloidal monolayers: A guide for nanotechnologists

Cited by 173 publications

References 571 publications

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Mechanotunable Plasmonic Properties of Colloidal Assemblies

The Translational and Rotational Dynamics of a Colloid Moving Along the Air-Liquid Interface of a Thin Film

Electrically Conductive Thin Films Derived from Bulk Graphite and Liquid–Liquid Interface Assembly

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