Synthesis and Optical Properties of Silver Nanobars and Nanorice

Wiley, Benjamin J.; Chen, Yeechi; McLellan, Joseph M.; Xiong, Yujie; Li, Zhiyuan; Ginger, David S.; Xia, Younan

doi:10.1021/nl070214f

Cited by 607 publications

(518 citation statements)

References 29 publications

(50 reference statements)

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“…25 In the present approach, bromide ions were used as the shape directing agent. [26][27][28][29][30] The bromide-mediated strategy is more favorable catalytically because the bromide species are only on the nanocrystal surface and are easily removed after synthesis by washing. In general, the metal salts ( Pt(IV) and Pt(II) ), the surfactants (PVP), and the shape directing agent (bromide ions) were dissolved in ethylene glycol at room temperature to form a precursor solution.…”

Section: Resultsmentioning

confidence: 99%

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

et al. 2009

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Platinum nanocubes and nanopolyhedra with tunable size from 5 nm to 9 nm were synthesized by controlling the reducing rate of metal precursor ions in a one-pot polyol synthesis. A two-stage process is proposed for the simultaneous control of size and shape.In the first stage, the oxidation state of the metal ion precursors determined the nucleation rate and consequently the number of nuclei. The reaction temperature controlled the shape in the second stage by regulation of the growth kinetics. These well-defined nanocrystals were loaded into MCF-17 mesoporous silica for examination of catalytic properties. Pt loadings and dispersions of the supported catalysts were determined by elemental analysis (ICP-MS) and H 2 chemisorption isotherms, respectively. Ethylene hydrogenation rates over the Pt nanocrystals were independent of both size and shape and comparable to Pt single crystals. For pyrrole hydrogenation, the nanocubes enhanced ring opening ability and thus showed a higher selectivity to n-butylamine compared to nanopolyhedra.

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Section: Resultsmentioning

confidence: 99%

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

et al. 2009

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“…We demonstrate this effect with pixel sizes of 5 × 5 μm-two orders of magnitude smaller than the pixel area in most display technologies. The polarization-selective plasmon resonant nanorod structures (25,26) fabricated here represent a first step toward the fabrication of active liquid crystal-based pixels. The enhanced intensities, tunable peak positions, and strong polarization characteristics of these pixels make them immediately compatible with LCD-based displays, without the need for color filters or multiple polarizers.…”

mentioning

confidence: 99%

Vivid, full-color aluminum plasmonic pixels

Olson

Manjavacas

Liu

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

274

255

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Aluminum is abundant, low in cost, compatible with complementary metal-oxide semiconductor manufacturing methods, and capable of supporting tunable plasmon resonance structures that span the entire visible spectrum. However, the use of Al for color displays has been limited by its intrinsically broad spectral features. Here we show that vivid, highly polarized, and broadly tunable color pixels can be produced from periodic patterns of oriented Al nanorods. Whereas the nanorod longitudinal plasmon resonance is largely responsible for pixel color, far-field diffractive coupling is used to narrow the plasmon linewidth, enabling monochromatic coloration and significantly enhancing the far-field scattering intensity of the individual nanorod elements. The bright coloration can be observed with p-polarized white light excitation, consistent with the use of this approach in display devices. The resulting color pixels are constructed with a simple design, are compatible with scalable fabrication methods, and provide contrast ratios exceeding 100:1.RGB | chromaticity | array | electron beam lithography D isplay technologies have been evolving toward vivid, fullcolor, flat-panel displays with high resolution and/or small pixel sizes, higher energy efficiency, and improved benefit/cost ratios. Some of the most popular current technologies are liquid crystal displays (LCD), laser phosphor displays, also known as electroluminescent displays, and light-emitting diode (LED)-based displays. A common characteristic of all color display technologies is the incorporation of various color-producing media, which can be inorganic, organic, or polymeric materials, into the device. These chromatic materials are chosen to produce the fundamental components of the color spectrum in additive color schemes such as the standard red-green-blue (sRGB) when illuminated by an internal light source or when an electrical voltage is applied.Inorganic chromatic materials have the potential to greatly extend the durability and lifetime of color displays. Inorganic nanoparticles have recently begun to be used in color displays in the form of quantum dot LEDs, which have excellent display lifetimes and industry-scalable, size-based, and material-based color tunability (1-3). However, obtaining blue colors from quantum dots has been challenging (4) owing to the requirement of synthesizing nanoparticles in the small size range required to achieve optical transitions in this wavelength range. Au nanoparticles can produce green and red colors based on their surface plasmon resonances (5), but shorter-wavelength hues are quenched because of interband transitions for wavelengths below 520 nm (6). Ag has also been investigated for display applications (7, 8), but although spectral features can be achieved across the visible region the material readily oxidizes (9, 10), requiring additional passivation layers.Al is potentially a highly attractive material for plasmon-based full-spectrum displays. Al is the third most abundant element in the earth's crust, beh...

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“…The scope of molecular self-assembly from nature such as proteins [1] and nanobiocomposites [2] has been expanded to include man-made materials which have forms such as nanoscopic spheres [3], rods [4], ellipsoids [5], core/shell [6], and nanocages [7]. They can be produced using various types of materials such as metals [6], semiconductors [8], oxides [9], and polymers [10].…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly in Micro- and Nanofluidic Devices: A Review of Recent Efforts

et al. 2011

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Self-assembly in micro-and nanofluidic devices has been the focus of much attention in recent years. This is not only due to their advantages of self-assembling with fine temporal and spatial control in addition to continuous processing that is not easily accessible in conventional batch procedures, but they have evolved to become indispensable tools to localize and assimilate micro-and nanocomponents into numerous applications, such as bioelectronics, drug delivery, photonics, novel microelectronic architectures, building blocks for tissue engineering and metamaterials, and nanomedicine. This review aims to focus on the most recent advancements and characteristic investigations on the self-assembly of micro-and nanoscopic objects in micro-and nanofluidic devices. Emphasis is placed on the salient aspects of this technology in terms of the types of micro-and nanomaterials being assembled, the principles and methodologies, as well as their novel applications.

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Synthesis and Optical Properties of Silver Nanobars and Nanorice

Cited by 607 publications

References 29 publications

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

Sub-10 nm Platinum Nanocrystals with Size and Shape Control: Catalytic Study for Ethylene and Pyrrole Hydrogenation

Vivid, full-color aluminum plasmonic pixels

Self-Assembly in Micro- and Nanofluidic Devices: A Review of Recent Efforts

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