Simultaneous Growths of Gold Colloidal Crystals

Goubet, Nicolas; Portalès, Hervé; Ye, Cong; Arfaoui, Imad; Albouy, Pierre‐Antoine; Mermet, A.; Pileni, Marie‐Paule

doi:10.1021/ja207941p

Cited by 89 publications

(138 citation statements)

References 28 publications

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“…At the air-toluene interface, however, a lm was observed. As described earlier by Pileni and coworkers 55 this interfacial lm is formed via a layer-by-layer growth mechanism (heterogeneous growth). Here, the particles stack perpendicular to the interface with the (111)-planes of the supercrystal oriented parallel to the interface.…”

Section: General Structural Characterization Of Gold Nanoparticle Supmentioning

confidence: 73%

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Olichwer¹,

Koschine

Meyer³

et al. 2016

RSC Adv.

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The performance of nanoparticle assemblies with respect to various applications (e.g. sensors, catalysts, filtration membranes) depends on their microporosity. Here, the microcavities within the ligand matrix of superlattice films comprised of 1-dodecanethiol-stabilized gold nanoparticles (GNPs, core diameter $4 and $5.5 nm) were studied by positron annihilation lifetime spectroscopy (PALS). The superlattice composition, the size and spatial arrangement of the GNP cores were characterized by thermogravimetric analysis, transmission electron microscopy and grazing-incidence small-angle X-rayscattering. From these data a structural model was derived to predict the sizes of the voids formed within the interstitial (tetrahedral and octahedral) sites of the superlattices. The comparison of the PALSmeasured cavity sizes (0.50 to 0.74 nm) with the predicted void sizes of the interstitial sites ($0.7 to $1.7 nm) and the free volume in solid dodecane (0.36 nm), previously measured by PALS, indicate that both types of cavities may contribute to the experimentally determined cavity sizes. However, the GNP core sizes had only a minor influence on the measured cavity size. Larger cavities with sizes corresponding to the voids ($1.7 nm) expected within the octahedral sites of the superlattices comprised of $5.5 nm-sized GNP cores could not be detected. Assuming the intensities arising from these voids are measurable, this finding suggests that the octahedral sites are occupied by excess ligands trapped during film preparation.Apart from the voids predicted for the interstitial sites, the larger cavity sizes measured for the GNP superlattices compared to crystalline dodecane may result from some degree of disorder in the ligand arrangement.

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Section: General Structural Characterization Of Gold Nanoparticle Supmentioning

confidence: 73%

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Olichwer¹,

Koschine

Meyer³

et al. 2016

RSC Adv.

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“…Yao et al reported a δ value 0.2 nm smaller in the 3D Au shaped supracrystals than the monolayer superlattice mediated by hydrogen bond 35 . For 5-8 nm Au nanocrystals coated with dodecanethiol, the simultaneously grown film and shape supracrystals show a δ difference (δ shape -δ film ) between -0.2 to 0.5 nm 36,37 . Furthermore, it is noteworthy that Shevchenko et al have shown that the interparticle distance of 7.0 nm PbS (stabilized with oleic acid) shape supracrystal formed by non-solvent diffusion method is 0.5 nm shorter than that of film superlattice by solvent evaporation method 7,38 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Self-Assembly Behavior of Charged Au Nanocrystals in Aqueous Solution

2015

Self Cite

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A series of water-soluble Au nanocrystals with different core sizes coated by either negatively or positively charged ligands are synthesized. We find a ligand inter-exchange process takes place when positively and negatively charged nanocrystals are mixed together and heated, resulting in mixed charged zwitterionic nanocrystals. The ligand exchange process between nanocrystals is studied in detail by electrophoresis. Self-assembly properties of the monocharged and zwitterionic nanocrystals are studied subsequently. By using the solvent evaporation process only the zwitterionic and positively charged nanocrystals can pack into well-ordered fcc lattice films. Under the non-solvent diffusion condition, only the zwitterionic nanocrystals can aggregate and form shaped supracrystals. Structural analysis shows that the interparticle distance of the shaped supracrystal made of zwitterionic nanocrystals is 1 nm larger than that of the film one. The different interparticle distance is ascribed to the different fabrication process. We consider that nanocrystals adopt the closest packing in the film supracrystal due to the destroyed electrical double layer during the drying process, while the electrostatic repulsion play an important role in determining the interparticle distance in shaped supracrystal.

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“…S1 †). 52,53 The resulting superlattices exhibit orientational ordering which implies an atomic alignment between the single-domain NPs. This crystallographic register explains the stronger interactions between single-domain NPs compared to the polycrystalline ones, induced by nanocrystal facet-to-facet geometry.…”

Section: Resultsmentioning

confidence: 99%

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

et al. 2015

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The influence of nanocrystallinity on the electronic and mechanical properties of metal nanoparticles is still poorly understood, due to the difficulty in synthesizing nanoparticles with a controlled internal structure. Here, we report on a new method for the selective synthesis of Au nanoparticles in either a singledomain or a polycrystalline phase maintaining the same chemical environment. We obtain quasi-spherical nanoparticles whose diameter is tunable from 6 to 13 nm with a resolution down to ≈0.5 nm and narrow size distribution (4-5%). The availability of such high-quality samples allows the study of the impact of the particle size and nanocrystallinity on a number of parameters, such as plasmon dephasing time, electronphonon coupling, period and damping time of the radial breathing modes.

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Simultaneous Growths of Gold Colloidal Crystals

Cited by 89 publications

References 28 publications

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Synthesis and Self-Assembly Behavior of Charged Au Nanocrystals in Aqueous Solution

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

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