Self-assembly of gold nanoparticles on functional organic molecular crystals

Trabattoni, Silvia; Moret, Massimo; Miozzo, Luciano; Campione, Marcello

doi:10.1016/j.jcis.2011.04.102

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…In recent years nanoparticles have found widespread application in sunscreens and cosmetics as well as in catalysis, − sensors, batteries, medicine, and electronics. − As a consequence, large quantities of nanoparticles have been released into the environment, with the amount expected to increase . Of particular concern is that nanoparticles can have chemical properties very different from those of their molecular constituents, a factor that is clearly seen in the limited number of studies currently available on colloidal metal transport through the geosphere.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Plutonium Oxide Nanoparticles

et al. 2012

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Adsorption of monodisperse cubic plutonium oxide nanoparticles ("Pu-NP", [Pu(38)O(56)Cl(x)(H(2)O)(y)]((40-x)+), with a fluorite-related lattice, approximately 1 nm in edge size) to the muscovite (001) basal plane from aqueous solutions was observed in situ (in 100 mM NaCl background electrolyte at pH 2.6). Uptake capacity of the surface quantified by α-spectrometry was 0.92 μg Pu/cm(2), corresponding to 10.8 Pu per unit cell area (A(UC)). This amount is significantly larger than that of Pu(4+) needed for satisfying the negative surface charge (0.25 Pu(4+) for 1 e(-)/A(UC)). The adsorbed Pu-NPs cover 17% of the surface area, determined by X-ray reflectivity (XR). This correlates to one Pu-NP for every 14 unit cells of muscovite, suggesting that each particle compensates the charge of the unit cells onto which it adsorbs as well as those in its direct proximity. Structural investigation by resonant anomalous X-ray reflectivity distinguished two different sorption states of Pu-NPs on the surface at two different regimes of distance from the surface. A fraction of Pu is distributed within 11 Å from the surface. The distribution width matches the Pu-NP size, indicating that this species represents Pu-NPs adsorbed directly on the surface. Beyond the first layer, an additional fraction of sorbed Pu was observed to extend more broadly up to more than 100 Å from the surface. This distribution is interpreted as resulting from "stacking" or aggregation of the nanoparticles driven by sorption and accumulation of Pu-NPs at the interface although these Pu-NPs do not aggregate in the solution. These results are the first in situ observation of the interaction of nanoparticles with a charged mineral-water interface yielding information important to understanding the environmental transport of Pu and other nanophase inorganic species.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Plutonium Oxide Nanoparticles

et al. 2012

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“…Gold nanoparticles (AuNPs) have been intensively investigated over the past few years with respect to their synthesis and self-assembly. − The specific properties of AuNPs make them of utmost interest for applications in electronics, optics, catalysis, or medicine. − AuNPs can be synthesized through various methodologies, the most common one being the citrate reduction of HAuCl 4 in water, introduced by Turkevich et al in 1951 . The use of citrate permits a controlled ligand exchange of the ions adsorbed on the surface.…”

Section: Introductionmentioning

confidence: 99%

Hybrid One-Dimensional Nanostructures: One-Pot Preparation of Nanoparticle Chains via Directed Self-Assembly of in Situ Synthesized Discrete Au Nanoparticles

et al. 2012

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The fabrication of well-defined one-dimensional (1D) arrays is becoming a challenge for the development of the next generation of advanced nanodevices. Herein, a simple concept is proposed for the in situ synthesis and self-assembly of gold nanoparticles (AuNPs) into 1D arrays via a one-step process. The results demonstrated the formation of nanoparticle chains (NPC) with high aspect ratio based on discrete Au nanoparticles stabilized by short thiol ligands. A model was proposed to explain the self-assembly based on the investigation of several parameters such as pH, solvent, temperature, and nature of the ligand on the 1D assembly formation. Hydrogen bonding was identified as a key factor to direct the self-assembly of the hybrid organic–inorganic nanomaterials into the well-defined 1D nanostructures. This simple and cost-effective concept could potentially be extended to the fabrication of a variety of hybrid 1D nanostructures possessing unique physical properties leading to a wide range of applications including catalysis, bionanotechnology, nanoelectronics, and photonics.

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“…Controlled growth of AuNP thin films at interfaces is required for many of these applications. Numerous methods employing non-covalent or covalent interactions have been studied to assemble AuNP at different surfaces [9][10][11][12][13][14]. AuNP assemblies on carbon substrates are receiving increasing attention.…”

Section: Introductionmentioning

confidence: 99%