Molecular Confinement in Nanometer-Size Superlattice Microstructures

Roxlo, C. B.; Deckman, H. W.; Abeles, B.

doi:10.1103/physrevlett.57.2462

Cited by 32 publications

(19 citation statements)

References 18 publications

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“…This ordered array of void spaces can serve as a physical mask through which other materials such as metals or dielectric materials can be selectively deposited onto the surface of the underlying substrate using ordinary lift-off procedures that involve vacuum evaporation or sputtering. [129] If the colloidal spheres are chemically linked to the surface of a substrate, it might also be possible to achieve pattern transfer by using solution-phase deposition or wet etching. [50] Figure 14 shows the schematic diagram of such an approach.…”

Section: D Crystalline Arrays Of Colloidal Spheres As Masks In Lithomentioning

confidence: 99%

Monodispersed Colloidal Spheres: Old Materials with New Applications

et al. 2000

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This article presents an overview of current research activities that center on monodispersed colloidal spheres whose diameter falls anywhere in the range of 10 nm to 1 mm. It is organized into three parts: The first part briefly discusses several useful methods that have been developed for producing monodispersed colloidal spheres with tightly controlled sizes and well-defined properties (both surface and bulk). The second part surveys some techniques that have been demonstrated for organizing these colloidal spheres into two-and three-dimensionally ordered lattices. The third part highlights a number of unique applications of these crystalline assemblies, such as their uses as photonic bandgap (PBG) crystals; as removable templates to fabricate macroporous materials with highly ordered and three-dimensionally interconnected porous structures; as physical masks in lithographic patterning; and as diffractive elements to fabricate new types of optical sensors. Finally, we conclude with some personal perspectives on the directions towards which future research in this area might be directed.

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Section: D Crystalline Arrays Of Colloidal Spheres As Masks In Lithomentioning

confidence: 99%

Monodispersed Colloidal Spheres: Old Materials with New Applications

et al. 2000

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“…Consequently novel approaches to parallel nanolithography are being explored including ͑1͒ diffusion-controlled aggregation at surfaces; 9 ͑2͒ laser-focused atom deposition; [10][11][12] and ͑3͒ nanometer-scale template formation from twodimensional ͑2D͒ crystalline protein monolayers, 13 the pores of aluminum oxide thin films, 14 and self-assembled polymer nanospheres forming a single monolayer ͑SL͒, ordered mosaic array mask for deposition or reactive-ion etching. [15][16][17][18][19][20] Deckman's ''natural lithography'' work attracted our attention because of its potential as an inexpensive, parallel, ''bench-top'' technique capable of fabricating Ag nanostructures for optical absorption studies related to surfaceenhanced Raman spectroscopy ͑SERS͒, 21-23 quantum dot structures in GaAs-based semiconductors, 24 -26 and high-T c Josephson effect devices. 27 Our own work, which we refer to by the operationally more descriptive term of nanosphere lithography ͑NSL͒, has extended SL natural lithography in several ways: 28 ͑1͒ development of a double-layer ͑DL͒ polymer colloid mask; ͑2͒ atomic force microscopy ͑AFM͒ studies of SL and DL periodic particle arrays ͑PPAs͒ of Ag on mica; and ͑3͒ fabrication of defect-free SL and DL PPAs of Ag/mica with areas of 4 -25 m 2 that permit microprobe studies of nanoparticle optical properties.…”

Section: Introductionmentioning

confidence: 99%

Nanosphere lithography: A materials general fabrication process for periodic particle array surfaces

Hulteen

Duyne

1995

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

1,410

1,079

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In this article nanosphere lithography (NSL) is demonstrated to be a materials general fabrication process for the production of periodic particle array (PPA) surfaces having nanometer scale features. A variety of PPA surfaces have been prepared using identical single-layer (SL) and double-layer (DL) NSL masks made by self-assembly of polymer nanospheres with diameter, D=264 nm, and varying both the substrate material S and the particle material M. In the examples shown here, S was an insulator, semiconductor, or metal and M was a metal, inorganic ionic insulator, or an organic π-electron semiconductor. PPA structural characterization and determination of nanoparticle metrics was accomplished with atomic force microscopy. This is the first demonstration of nanometer scale PPA surfaces formed from molecular materials.

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“…[21,22] Dissolution of 1bCl and Nile red ([Nile red] 0 = 10 mm) in water leads to aggregation of 1bCl to form micelles that encapsulate Nile red molecules in the core. Figure 1 a shows absorption spectra of solutions with different concentration of 1bCl (from 3.…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of the I 1 (375 nm) and the I 3 (385 nm) peaks of pyrene monomer, I 3 /I 1 = 0.86, indicates that the pyrene is located in a nonpolar microenvironment. [22] We also investigated the micelle-formation process of 1bCl in D 2 O using 1 H NMR spectroscopy ( Figure 3). Increasing concentration of 1bCl from 5.0 to 50 mm causes upfield shifts of the signals.…”

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confidence: 99%

Hydrogels Composed of Organic Amphiphiles and α‐Cyclodextrin: Supramolecular Networks of Their Pseudorotaxanes in Aqueous Media

Taira

Suzaki

Osakada

2010

Chemistry A European J

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Mixtures of N-alkyl pyridinium compounds [py-N-(CH(2))(n)OC(6)H(3)-3,5-(OMe)(2)](+)(X(-)) (1bCl: n = 10, X = Cl; 1cBr: n = 12, X = Br) and alpha-cyclodextrin (alpha-CD) form supramolecular hydrogels in aqueous media. The concentrations of the two components influences the sol-gel transition temperature, which ranges from 7 to 67 degrees C. Washing the hydrogel with acetone or evaporation of water left the xerogel, and (13)C CP/MAS NMR measurements, powder X-ray diffraction (XRD), and scanning electron microscopy (SEM) revealed that the xerogel of 1bCl (or 1cBr) and alpha-CD was composed of pseudorotaxanes with high crystallinity. (13)C{(1)H} and (1)H NMR spectra of the gel revealed the detailed composition of the components. The gel from 1bCl and alpha-CD contains the corresponding [2]- and [3]pseudorotaxanes, [1b x (alpha-CD)]Br and [1b x (alpha-CD)(2)]Br, while that from 1cBr and alpha-CD consists mainly of [3]pseudorotaxane [1c x (alpha-CD)(2)]Br. 2D ROESY (1)H NMR measurements suggested intermolecular contact of 3,5-dimethoxyphenyl and pyridyl end groups of the axle component. The presence of the [3]pseudorotaxane is indispensable for gel formation. Thus, intermolecular interaction between the end groups of the axle component and that between alpha-CDs of the [3]pseudorotaxane contribute to formation of the network. The supramolecular gels were transformed into sols by adding denaturing agents such as urea, C(6)H(3)-1,3,5-(OH)(3), and [py-N-nBu](+)(Cl(-)).

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Molecular Confinement in Nanometer-Size Superlattice Microstructures

Cited by 32 publications

References 18 publications

Monodispersed Colloidal Spheres: Old Materials with New Applications

Monodispersed Colloidal Spheres: Old Materials with New Applications

Nanosphere lithography: A materials general fabrication process for periodic particle array surfaces

Hydrogels Composed of Organic Amphiphiles and α‐Cyclodextrin: Supramolecular Networks of Their Pseudorotaxanes in Aqueous Media

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