Submicrometer Surface Patterning Using Interfacial Colloidal Particle Self-Assembly

Ray, Matthew A.; Shewmon, Nathan T.; Bhawalkar, Sarang P.; Li, Jia; Yang, Yuzhen; Daniels, Eric S.

doi:10.1021/la900257p

Cited by 37 publications

(32 citation statements)

References 33 publications

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“…The "moth eye" antireflection surface consisting of submicron structure arrays, with refractive index varying monotonically from the air to the substrate along its thickness, can be thought of as a set of multilayers with minimal difference in the refractive index according to effective medium theory and effectively suppress the specular reflectance at the interface of the two media [23,24]. Therefore, periodic nanostructures which could lead to an effective refractive index gradient were designed to diminish the reflection [25][26][27]. The nanostructures we prepared, with tapered profile, can be approximately equivalent to a gradient-refractive index submicrometer coating.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Optical Property of PeriodicSn1-xTixO2Nanostructures Patterned by the Polystyrene Mi

Chen

Zhang

2011

Journal of Nanomaterials

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Regular arrays ofSn1-xTixO2nanostructures were fabricated by glancing angle sputter deposition onto self-assembled close-packed arrays of 200 nm diameter, 500 nm diameter, and 1 μm diameter polystyrene microspheres, respectively. The morphology of the nanostructures could be modulated by the variation of the sputtering power of Ti target and the size of polystyrene microspheres templates. Accordingly, the performance of reflection which was dependent on the morphology of nanostructures could be tuned by optimizing the parameters. The anisotropic morphology of nanoflakes achieved by adjusting the sputtering power of Ti target could generate the anisotropism of reflectance. With the increase of the PS sphere size, the anisotropism of nanostructures weakened; however, they exhibited excellent antireflection effects by creating a smaller gradient of refractive index.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Optical Property of PeriodicSn1-xTixO2Nanostructures Patterned by the Polystyrene Mi

Chen

Zhang

2011

Journal of Nanomaterials

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“…The difficulty of the transfer procedure is to prevent the loss of position of the particles by viscous drags and capillary forces acting during solvent evaporation. [101] Therefore, they chose attractive particle-substrate interactions. Hexane proved to be the solvent of choice for the oilphase as it possessed a low viscosity paired with a high volatility to overcome the forces during substrate drying.…”

Section: Direct Assembly Of Non-close-packed Monolayers At the Oil-wamentioning

confidence: 99%

Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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This thesis focuses on the controlled assembly of monodisperse polymer colloids into ordered two-dimensional arrangements. These assemblies, commonly referred to as colloidal monolayers, are subsequently used as masks for the generation of arrays of complex metal nanostructures on solid substrates.The motivation of the research presented here is twofold. First, monolayer crystallization methods were developed to simplify the assembly of colloids and to produce more complex arrangements of colloids in a precise way. Second, various approaches to colloidal lithography are designed with the aim to include novel features or functions to arrays of metal nanostructures.The air/water interface was exploited for the crystallization of colloidal monolayer architectures as it combines a two-dimensional confinement with a high lateral mobility of the colloids that is beneficial for the creation of high long range order. A direct assembly of colloids is presented that provides a cheap, fast and conceptually simple methodology for the preparation of ordered colloidal monolayers. The produced two-dimensional crystals can be transformed into nonclose-packed architectures by a plasma-induced size reduction step, thus providing valuable masks for more sophisticated lithographic processes. Finally, the controlled co-assembly of binary colloidal crystals with defined stoichiometries on a Langmuir trough is introduced and characterized with respect to accessible configurations and size ratios.Several approaches to lithography are presented that aim at introducing different features to colloidal lithography. First, using metal-complex containing latex particles, the synthesis of which is described as well, symmetric arrays of metal nanoparticles can be created by controlled combustion of the organic material of the colloids. The process does not feature an inherent limit in nanoparticle size and is able to produce complex materials as will be demonstrated for FePt alloy particles. Precise control over both size and spacing of the particle array is presented.Second, two lithographic processes are introduced to create sophisticated nanoparticle dimer units consisting of two crescent shaped nanostructures in close proximity; essentially by using a single colloid as mask to generate two structures simultaneously. Strong coupling processes of the parental plasmon resonances of the two objects are observed that are accompanied by high near-field enhancements. A plasmon hybridization model is elaborated to explain all polarization dependent shifts of the resonance positions. Last, a technique to produce laterally patterned, ultra-flat substrates without surface topographies by embedding gold nanoparticles in a silicon dioxide matrix is applied to construct robust and re-usable sensing architectures and to introduce an approach for the nanoscale patterning of solid supported lipid bilayer membranes.

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“…Isa et al prepared non‐close packed arrays of colloidal particles by assembly at the oil–water interface and demonstrated high control over interparticle spacing 12. Similarly, assembly at the air–water interface has been exploited for the preparation of non‐close packed monolayers 13–16…”

Section: Introductionmentioning

confidence: 99%

A Convenient Method to Produce Close‐ and Non‐close‐Packed Monolayers using Direct Assembly at the Air–Water Interface and Subsequent Plasma‐Induced Size Reduction

Vogel

Goerres

Landfester

et al. 2011

Macro Chemistry & Physics

252

295

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An extremely facile approach to produce close‐packed colloidal monolayers over large areas using direct assembly at the air–water interface is presented. The influence of small amounts of sodium dodecyl sulfate (SDS) as well as the influence of the pH value of the subphase on the quality of the resulting monolayer is investigated. It is found that small amounts of SDS at the interface influence capillary forces and form a soft barrier that facilitates the crystallization process. Increased electrostatic repulsion arising from a higher pH of the subphase induced a higher order using carboxylic acid functionalized particles. The deposited close‐packed monolayers were subjected to plasma treatment in order to shrink the colloids and produce non‐close packed monolayers with lattice spacing and symmetry reflecting the order of the initial close‐packed monolayer. A detailed examination of etching conditions and their influence on the shrinkage of the particles was performed, including effects of plasma power, composition, flow rates as well as polymeric‐ and substrate material. The monolayers exhibit vivid coloration, which is determined by their size and packing density. UV–Vis–NIR spectroscopy was used to investigate the change of monolayer color during the size reduction of the individual particles. A simple theoretical model was elaborated to explain the optical properties. Finally, the non‐close‐packed monolayers were used as masks to produce gold nanostructures to exemplify the versatility of the monolayer architectures in nanosphere lithography.

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Submicrometer Surface Patterning Using Interfacial Colloidal Particle Self-Assembly

Cited by 37 publications

References 33 publications

Fabrication and Optical Property of PeriodicSn1-xTixO2Nanostructures Patterned by the Polystyrene Mi

Fabrication and Optical Property of PeriodicSn1-xTixO2Nanostructures Patterned by the Polystyrene Mi

Surface Patterning with Colloidal Monolayers

A Convenient Method to Produce Close‐ and Non‐close‐Packed Monolayers using Direct Assembly at the Air–Water Interface and Subsequent Plasma‐Induced Size Reduction

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