Journal ArticleDOI
Two-dimensional arrays of colloidal gold particles : A flexible approach to macroscopic metal surfaces
Katherine C. Grabar,Keith J. Allison,Bonnie E. Baker,Robin M. Bright,Kenneth R. Brown,R. Griffith Freeman,Audrey P. Fox,Christine D. Keating,and Michael D. Musick,Michael J. Natan +9 more
TLDR
In this article, a flexible and general approach to formation of macroscopic colloidal Au surfaces that have well-defined nanostructure is presented. But the assembly method described in this paper is compared with previous methods for controlling the na...Abstract:
Covalent attachment of nanometer-scale colloidal Au particles to organosilane-coated substrates is a flexible and general approach to formation of macroscopic Au surfaces that have well-defined nanostructure. Variations in substrate (glass, metal, Al2O3), geometry (planar, cylindrical), functional group (−SH, −P(C6H5)2, −NH2, −CN), and particle diameter (2.5−120 nm) demonstrate that each component of these assemblies can be changed without adverse consequences. Information about particle coverage and interparticle spacing has been obtained using atomic force microscopy, field emission scanning electron microscopy, and quartz crystal microgravimetry. Bulk surface properties have been probed with UV−vis spectroscopy, cyclic voltammetry, and surface enhanced Raman scattering. Successful application of the latter two techniques indicates that these substrates may have value for Raman and electrochemical measurements. The assembly method described herein is compared with previous methods for controlling the na...read more
Citations
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Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology.
TL;DR: A review of gold nanoparticles can be found in this article, where the most stable metal nanoparticles, called gold colloids (AuNPs), have been used for catalysis and biology applications.
Journal ArticleDOI
Interparticle Coupling Effect on the Surface Plasmon Resonance of Gold Nanoparticles: From Theory to Applications
Sujit Kumar Ghosh,Tarasankar Pal +1 more
TL;DR: This paper presents a meta-analysis of four-Wave Mixing and its applications in nanofiltration, which shows clear trends in high-performance liquid chromatography and also investigates the role of nano-magnifying lens technology in this process.
Journal ArticleDOI
Bimetallic nanoparticles—novel materials for chemical and physical applications
Naoki Toshima,Tetsu Yonezawa +1 more
TL;DR: In this article, a review on the preparation, characterization and application of polymer- or ligand-stabilized bimetallic nanoparticles in dispersion, emphasizing their own work and introducing recent progress of this area is presented.
Journal ArticleDOI
Seeding of Colloidal Au Nanoparticle Solutions. 2. Improved Control of Particle Size and Shape
TL;DR: In this article, the surface of preformed 12-nm-diameter Au nanoparticles is reduced by boiling sodium citrate, producing particles highly uniform in size and shape, and a similar procedure, utilizing the reductant NH2OH at room temperature, produces two populations of particles.
Journal ArticleDOI
Catalytic properties of silver nanoparticles supported on silica spheres.
TL;DR: It is found that the presence of surfactants depresses the catalytic activity of the silver particles to some extent by inhibiting the adsorption of reactants onto the surface of the particles.
References
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Journal ArticleDOI
Controlled nucleation for the regulation of the particle size in monodisperse gold suspensions
TL;DR: In this article, a series of monodisperse suspensions of the same chemical composition but of rather different particle sizes was used to study particle size dependent phenomena, such as Brownian motion, light scattering, sedimentation and electrophoresis of small particles.
Journal ArticleDOI
Green fluorescent protein as a marker for gene expression
TL;DR: A complementary DNA for the Aequorea victoria green fluorescent protein produces a fluorescent product when expressed in prokaryotic or eukaryotic cells, which can be used to monitor gene expression and protein localization in living organisms.
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Surface-enhanced spectroscopy
TL;DR: The surface-enhanced Raman scattering (SERS) effect was first discovered by Fleischmann, Van Duyne, Creighton, and Creighton as discussed by the authors, who showed that molecules adsorbed on specially prepared silver surfaces produce a Raman spectrum that is at times a millionfold more intense than expected.
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Preparation and Characterization of Au Colloid Monolayers
TL;DR: In this article, the design and initial characterization of two-dimensional arrays of colloidal Au particles are reported, which are prepared by self-assembly of 12 nm diameter colloidal particles onto immobilized polymers having pendant functional groups with high affinity for Au (i.e., CN, SH, and NH 2 ).
Journal ArticleDOI
Surface-enhanced Raman scattering
TL;DR: In this article, the authors developed a surface-enhanced Raman scattering (SERS) model of adsorbates on metal surfaces, where the long-range enhancement by resonances of the macroscopic laser and Stokes field is separated quantitatively from the metal electron-mediated resonance Raman effect.