Visible Region Polarization Spectroscopic Studies of Template-Synthesized Gold Nanoparticles Oriented in Polyethylene

Al-Rawashdeh, Nathir A. F.; Sandrock, M.; Seugling, and Carolyn J.; Foss, Colby A.

doi:10.1021/jp972869i

Cited by 95 publications

(85 citation statements)

References 33 publications

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“…The change in the incidence angle ( ) modifies the spectrum (see Figure 16.2.7B): as increases, a second spectral band grows in corresponding to the long-axis resonance. Converse to the transverse resonance case, the wavelength maximum of the longitudinal resonance increases with increasing particle aspect ratio (23,85). 696 …”

Section: Optical Propertiesmentioning

confidence: 99%

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Template Deposition of Metals

Ugo

Moretto

2007

Handbook of Electrochemistry

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Template synthesis is a relatively simple and easy procedure which has made the fabrication of rather sophisticated nanomaterials accessible to almost any laboratory. Template synthesis requires access to instrumentation capable of metal sputtering and electrochemical deposition. The characterization of the fabricated nanostructures can be done using instrumental techniques including spectrophotometry, voltammetry, optical microscopy, atomic force microscopy, and electronic microscopies (scanning electron microscopy (SEM) and transmission electron microscopy (TEM)).The method is based on the simple but effective idea that the pores of a host material can be used as a template to direct the growth of new materials. Historically, template synthesis was introduced by Possin (1) and refined by Williams and Giordano (2) who prepared different metallic nanowires with widths as small as 10 nm within the pores of etched nuclear damaged tracks in mica. It was further developed by Martin's group (3-5) and followed by others (6) with the number of examples and applications (7) continually increasing. The nanoporous membranes usually employed as templates are alumina or track-etched polymeric membranes which are widely used as ultrafiltration membranes. Recently, metal nanostructures have also been obtained using the pores created by self-assembly in block copolymer structures under the influence of electric fields and high temperatures (8, 9).The first part of this section focuses on the main characteristics and fabrication techniques used for obtaining templating membranes and depositing metal nanostructures by suitable electroless and electrochemical procedures. Methods such as sol-gel (10-12) or chemical vapor deposition (10, 13), which have been used primarily for the template deposition of carbon, oxides, or semiconducting-based materials, will not be considered here in detail. The second part of the section focuses on the electrochemical properties of the fabricated nanomaterials with emphasis on the characteristics and applications of nanoelectrode ensembles (NEEs). Templating membranes 16.2.2

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Section: Optical Propertiesmentioning

confidence: 99%

“…The spectra resulting from the aqueous dispersion of the nanorods removed from the host template show two plasmon resonance bands: a strong one at long wavelengths due to the long-axis resonance and a weaker one at shorter wavelengths that originates from the transverse resonance (85).…”

Section: Template Deposition Of Metals 697mentioning

confidence: 99%

Template Deposition of Metals

Ugo

Moretto

2007

Handbook of Electrochemistry

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“…It has been proposed that the absorbance of uniaxially oriented nanostructures as a function of u can be described by the expression 138) A tot = A par cos 2 u + A per sin 2 u…”

Section: Dichroic Nanocompositesmentioning

confidence: 99%

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Caseri¹

2000

Macromol. Rapid Commun.

535

335

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Upon transmission of visible light through composites comprising of a transparent polymer matrix with embedded particles, the intensity loss by scattering is substantially reduced for particle diameters below 50–100 nm (nanoparticles, nanosized particles). As a consequence, related materials (nanocomposites) have found particular interest in optical studies. The first part of this article deals with a historical survey on nanoparticles and nanocomposites and the importance of small particle sizes on their optical properties. The second part focuses on results from our laboratory concerning nanocomposites with extremely high or low refractive indices and dichroic nanocomposites and their application in bicolored liquid crystal displays (LCD). The inorganic colloids required for these studies (lead sulfide, iron sulfides, gold, and silver) were prepared in situ in presence of a polymer or isolated as redispersable metal colloids modified at the surface with a self‐assembled monolayer (SAM) of an alkanethiol. The nanocomposites themselves were finally obtained by coprecipitation, spin coating, solvent casting or melt extrusion, with poly(ethylene oxide), gelatin, poly(vinyl alcohol) and polyethylene as matrix polymers.

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“…In general, gold nanoparticles are of special interest because of their potential applications in electronic, optical, and biomedical materials. [30][31][32][33][34][35] Apart from this, glycopolymers are of great interest because of binding interactions between carbohydrates and lectins. Interactions between saccharides and proteins are usually weak but can be markedly increased by displaying multiple saccharides in close proximity to each other, yielding multivalent binding sites, commonly known as the ''glyco-cluster effect''.…”

Section: Introductionmentioning

confidence: 99%

Glycopolymer‐Grafted Polystyrene Nanospheres

Pfaff

Shinde

Lü

et al. 2010

Macromolecular Bioscience

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The synthesis and characterization of spherical sugar-containing polymer brushes consisting of PS cores onto which chains of sugar-containing polymers have been grafted via two different techniques are described. Photopolymerization in aqueous dispersion using the functional monomer MAGlc and crosslinked or non-crosslinked PS particles covered with a thin layer of photo-initiator yielded homogeneous glycopolymer brushes attached to spherical PS cores. As an alternative, ATRP was used to graft poly-(N-acetylglucosamine) arms from crosslinked PS cores. Deprotection of the grafted brushes led to water-soluble particles that act as carriers for catalytically active gold nanoparticles. These glycopolymer chains show a high affinity to adsorb WGA whereas no binding to BSA or PNA could be detected.

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Visible Region Polarization Spectroscopic Studies of Template-Synthesized Gold Nanoparticles Oriented in Polyethylene

Cited by 95 publications

References 33 publications

Template Deposition of Metals

Template Deposition of Metals

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Glycopolymer‐Grafted Polystyrene Nanospheres

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