Optically Nonlinear Crystalline Colloidal Self Assembled Submicron Periodic Structures for Optical Limiters

Asher, Sanford A.; Chang, Song-Yuan; Tse, A.; Liu, Lei; Pan, Guisheng; Wu, Zhijun; Li, Pusheng

doi:10.1557/proc-374-305

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…An additional driving force has been the prospect of exploiting these size-dependent properties to create new functional materials and advanced devices. Resourceful use of the optical properties of nanoparticles has resulted in new types of filters, , substrates for surface-enhanced spectroscopies, − biosensors, − bioprobes, , chemical sensors, , and optical devices. − The magnetic properties of nanoparticles have applications to new data storage media , and biological probes . New fundamental understanding of heterogeneous catalytic properties has arisen from the use of nanoparticle-based model systems. ,,, Single-electron transistors have been developed based on the size-dependent electronic transport properties of nanoparticles …”

Section: Introductionmentioning

confidence: 99%

Nanosphere Lithography: Size-Tunable Silver Nanoparticle and Surface Cluster Arrays

et al. 1999

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Nanosphere lithography (NSL) is an inexpensive, inherently parallel, high-throughput, and materials-general nanofabrication technique capable of producing well-ordered 2D periodic particle arrays of nanoparticles. This paper focuses on the synthesis of size-tunable silver nanoparticle arrays by nanosphere lithography and their structural characterization by atomic force microscopy (AFM). The in-plane diameter, a, of Ag nanoparticles was tuned from 21 to 126 nm by systematic variation of the nanosphere diameter, D. Similarly, the out-of-plane height, b, was tuned from 4 to 47 nm by varying the mass thickness, d m, of the Ag overlayer. Experimental measurements of a, b, and interparticle spacing d ip of many individual nanoparticles as a function of D and d m were carried out using AFM. These studies show (i) b = d m, (ii) d ip accurately corresponds to predictions based on the nanosphere mask geometry, (iii) a, after correction for AFM tip convolution, is governed only by the mask geometry and the standard deviation, σD, of the nanosphere diameter, and (iv) line-of-sight deposition is strictly operative. Furthermore, we have established that nanosphere lithography can fabricate nanoparticles that contain only ca. 4 × 104 atoms and are in the size range of a surface-confined cluster.

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Section: Introductionmentioning

confidence: 99%

Nanosphere Lithography: Size-Tunable Silver Nanoparticle and Surface Cluster Arrays

et al. 1999

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“…The IPCCA materials we are developing to detect Pb 2+ in body fluids consist of a mesoscopically periodic array of colloidal particles [11,12,13,14,15,16,17,18,19,20] polymerized into an acrylamide hydrogel [2,3,4,21,22,23] (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…The Donnan potential resulting from the bound Pb 2+ results in an osmotic pressure which causes the gel to swell against the elastic gel restoring force [2,3,4] The resulting change in the particle array lattice constant shifts the diffracted wavelength [11,12,13,14,15,16,17,18,19,20,21,22,23] (Fig. 1C).…”

Section: Introductionmentioning

confidence: 99%

Polymerized crystalline colloidal array chemical-sensing materials for detection of lead in body fluids

et al. 2002

Self Cite

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We have developed intelligent polymerized crystalline colloidal array (IPCCA) chemical-sensing materials for detection of Pb(2+) in high ionic-strength environments such as body fluids with a detection limit of <500 nmol L(-1) Pb(2+) (100 ppb). This IPCCA lead sensor consists of a mesoscopically periodic array of colloidal particles polymerized into an acrylamide hydrogel. The array Bragg-diffracts light in the visible spectral region because of the periodic spacing of the colloidal particles. This material also contains a crown ether chelating agent for Pb(2+). Chelation of Pb(2+) by the IPCCA in low-ionic-strength solutions results in a Donnan potential that swells the gel, which red-shifts the diffracted light in proportion to the Pb(2+) concentration. At high ionic strength the Donnan potential is, unfortunately, swamped and no static response occurs for these sensors. We demonstrate, however, that we can determine Pb(2+) at high ionic strength by incubating these IPCCA in a sample solution and then measuring their transient response on exposure to pure water. The non-complexed ions diffuse from the IPCCA faster than the bound Pb(2+). The resulting transient IPCCA diffraction red-shift is proportional to the concentration of Pb(2+) in the sample. These IPCCA sensors can thus be used as sensing materials in optrodes to determine Pb(2+) in high-ionic-strength solutions such as body fluids.

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“…Since the lattice spacings have dimensions >100 nm, colloidal crystalline dispersions efficiently Bragg diffract visible light and display iridescent colors. They have potential applications as rejection filters, , optical limiters, and switches . Narrow bandwidth filters composed of monodisperse polystyrene latexes in water have been used to reject the Rayleigh scattering in a Raman spectrometer .…”

Section: Introductionmentioning

confidence: 99%

Optical Diffraction from Silica−Poly(methyl methacrylate) Composite Films

Jethmalani¹,

Sunkara²,

Ford³

et al. 1997

Langmuir

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Monodisperse, 152 nm diameter, amorphous, colloidal silica particles in methyl methacrylate (MMA) dispersions form crystal lattices and Bragg diffract visible light. Nucleation, growth, and crystallite morphology are observed by polarizing microscopy. Polymerization of 264 μm thick films of the MMA dispersion traps the crystal order in robust silica−poly(methyl methacrylate) (PMMA) composites. UV−vis spectra of 35−45 wt % of silica coated with 3-(trimethoxysilyl)propyl methacrylate (TPM−silica) in MMA dispersions have low percent transmittance (%T) peaks of 4 nm bandwidth at wavelengths between 550 and 508 nm. The silica−PMMA composite films containing 35−37.5 wt % TPM−silica have low %T peaks at 486−490 nm with 12−19 nm bandwidths. Using a 442 nm helium cadmium laser, the Bragg diffraction of a MMA dispersion and a PMMA composite is observed in the reflective mode.

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Optically Nonlinear Crystalline Colloidal Self Assembled Submicron Periodic Structures for Optical Limiters

Cited by 14 publications

References 8 publications

Nanosphere Lithography: Size-Tunable Silver Nanoparticle and Surface Cluster Arrays

Nanosphere Lithography: Size-Tunable Silver Nanoparticle and Surface Cluster Arrays

Polymerized crystalline colloidal array chemical-sensing materials for detection of lead in body fluids

Optical Diffraction from Silica−Poly(methyl methacrylate) Composite Films

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