Room Temperature, High-Yield Synthesis of Multiple Shapes of Gold Nanoparticles in Aqueous Solution

Sau, Tapan K.; Murphy, Catherine J.

doi:10.1021/ja047846d

Cited by 1,526 publications

(1,350 citation statements)

References 26 publications

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“…17,18 Interestingly, most synthetic methods to date yield nanostructures with convex shapes enclosed by lowindex {111}, {100}, and/or {110} facets, and there are very few methods [19][20][21][22] that allow one to realize nanostructures with highindex faces. Herein, we describe how seed-mediated methods, originally developed by Murphy et al 23,24 and El-Sayed et al, 25 can be modified with the appropriate surfactant to yield a novel class of high-index {720}-faceted Au concave nanocubes.…”

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confidence: 99%

Concave Cubic Gold Nanocrystals with High-Index Facets

et al. 2010

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A new class of gold nanostructures, concave nanocubes, enclosed by 24 high-index {720} facets, have been prepared in a monodisperse fashion by a modified seed-mediated synthetic method. The Cl− counterion in the surfactant plays an essential role in controlling the concave morphology of the final product. The concave nanocubes exhibit higher chemical activities compared with low-index {111}-faceted octahedra.

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confidence: 99%

Concave Cubic Gold Nanocrystals with High-Index Facets

et al. 2010

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“…The Au quasi-spherical and rod shaped nanoparticles were synthesized using the methods described by Murphy et al 34 and Nikoobakht et al 35 respectively. The nanoparticles were then stabilized with 11-mercaptoundecanoic acid 5 (MUA) followed by the covalent attachment of 5'-end amine modified DNA (i.e.…”

Section: Dna Functionalization Of Au Nanoparticlesmentioning

confidence: 99%

Dual Nanoparticle Amplified Surface Plasmon Resonance Detection of Thrombin at Subattomolar Concentrations

2014

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This version is available at https://strathprints.strath.ac.uk/50087/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractA novel dual nanoparticle amplification approach is introduced for the enhanced surface plasmon resonance (SPR) detection of a target protein at subattomolar concentrations.Thrombin was used as a model target protein as part of a sandwich assay involving an antithrombin (anti-Th) modified SPR chip surface and a thrombin specific DNA aptamer (Thaptamer) whose sequence also includes a polyadenine (A30) tail. Dual nanoparticle (NP) enhancement was achieved with the controlled hybridization adsorption of first polythymine-NP conjugates (T20-NPs) followed by polyadenine-NP's (A30-NPs). Two different nanoparticle shapes (nanorod and quasi-spherical) were explored resulting in four different NP pair combinations being directly compared. It was found that both the order and NP shape were important in optimizing the assay performance. The use of real-time SPR measurements to detect target concentrations as low as 0.1 aM is a ten-fold improvement compared to single NP-enhanced SPR detection methods.

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“…Even if the synthesis of metallic nanoparticles (Ag, Au [13], Pd [14,15]) in aqueous solution was successful, the mechanism of formation of metallic nanoparticles in aqueous solution remains still unclear. Despite the thermodynamic stabilization of given facets by a preferential adsorption of the capping agent can be reasonably considered as the driving force for the controlled growth, other parameters could be also critical to achieve the shape control of the nanoparticle.…”

Section: Proposition Of a Mechanism For Platinum Nanoparticles Formationmentioning

confidence: 99%

“…Since the crystalline growth rate varies exponentially with the surface energy, the selective adsorption of an additive on a given crystallographic plane can inhibit the growth rate along one crystallographic direction leading to a preferential growth along one other specific direction. This thermodynamic control was successfully applied in nanostructured metallic particles synthesis in organic solution (polyol processes) [11,12] using a polymer as a capping agent, or in aqueous solution using a surfactant as both a capping and a structure-directing agent, as it was previously done for Au [13] or Pd [14,15]. Platinum nanoparticles can be synthesized in aqueous solutions using a number of different methods.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene

Minh

Oudart

Baubet

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Catalyseurs hétérogènes nanostructurés : nanoparticules de platine de morphologies définies supportées sur alumine. Préparation, caractérisation et application en hydrogénation sélective du buta-1,3-diène -Des nanoparticules de platine possédant des morphologies particulières ont été préparées en solution aqueuse. Des paramètres clefs, tels que le ratio entre le tensioactif (bromure de cetyltrimethylammonium, CTAB) et le précurseur de platine (H 2 PtCl 6 ), la température, l'atmosphère (argon ou hydrogène), doivent être maîtrisés pour contrôler la formation des particules de platine nanostructurées et leurs morphologies. Des nanoparticules de platine se présentant soit sous la forme de cubes, soit sous la forme d'un mélange de formes (bâtonnets, cubes, tétraèdres), soit sous la forme de polyèdres ont ainsi été obtenues selon le ratio CTAB/Pt utilisé, l'atmosphère et la température. Un mécanisme de formation de ces nanoparticules de platine est proposé. Les nanoparticules de platine ont ensuite été déposées sur alumine et leurs propriétés catalytiques évaluées dans la réaction d'hydrogénation sélective du buta-1,3-diene. Les catalyseurs préparés avec des nanoparticules de platine se présentant sous la forme de polyèdres, qui exposent préférentiellement les plans cristallographiques (111), sont les plus sélectifs pour l'hydrogénation du buta-1,3-diene en butènes, avec une diminution considérable de l'hydrogénation complète vers les butanes. Abstract -Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene -Platinum nanoparticles with specific morphologies were prepared in aqueous solution. Key parameters, such as cationic surfactant (cetyltrimethylammonium bromide CTAB) and platinum precursor (H 2 PtCl 6 ) ratio, temperature, atmosphere (argon or hydrogen), were required to control the formation of nanostructured platinum particles, with well defined morphologies, and even to control their morphology. Platinum nanoparticles with mainly cubic morphologies, with a mix of morphologies (rods, cubes, tetrahedra)

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Room Temperature, High-Yield Synthesis of Multiple Shapes of Gold Nanoparticles in Aqueous Solution

Cited by 1,526 publications

References 26 publications

Concave Cubic Gold Nanocrystals with High-Index Facets

Concave Cubic Gold Nanocrystals with High-Index Facets

Dual Nanoparticle Amplified Surface Plasmon Resonance Detection of Thrombin at Subattomolar Concentrations

Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene

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