References of "Nano Letters"
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See detailAssembly of Ligand-Stripped Nanocrystals into Precisely Controlled Mesoporous Architectures
Buonsanti, R.; Pick, T. E.; Krins, Natacha ULg et al

in Nano Letters (2012), 12

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See detailpH-Programmable DNA Logic Arrays Powered by Modular DNAzyme Libraries
Elbaz, J.; Wang, F.; Remacle, Françoise ULg et al

in Nano Letters (2012)

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See detailGrowth of Straight InAs-on-GaAs Nanowire Heterostructures
Messing, Maria E; Wong-Leung, Jennifer; Zanolli, Zeila ULg et al

in Nano Letters (2011), 11(9), 3899-3905

One of the main motivations for the great interest in semiconductor nanowires is the possibility of easily growing advanced heterostructures that might be difficult or even impossible to achieve in thin ... [more ▼]

One of the main motivations for the great interest in semiconductor nanowires is the possibility of easily growing advanced heterostructures that might be difficult or even impossible to achieve in thin films. For III␣V semiconductor nanowires, axial heterostructures with an interchange of the group III element typically grow straight in only one interface direction. In the case of InAs␣GaAs heterostructures, straight nanowire growth has been demonstrated for growth of GaAs on top of InAs, but so far never in the other direction. In this article, we demonstrate the growth of straight axial heterostructures of InAs on top of GaAs. The heterostructure interface is sharp and we observe a dependence on growth parameters closely related to crystal structure as well as a diameter dependence on straight nanowire growth. The results are discussed by means of accurate first principles calculations of the inter- facial energies. In addition, the role of the gold seed particle, the effect of its composition at different stages during growth, and its size are discussed in relation to the results observed. [less ▲]

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See detailShape Induced Symmetry in Self-Assembled Mesocrystals of Iron Oxide Nanocubes
Disch, Sabrina; Wetterskog, Erik; Hermann, Raphaël ULg et al

in Nano Letters (2011), 11(4), 1651-1656

Grazing incidence small-angle scattering,and electron microscopy have been used to show for the first time that nonspherical nanoparticles can assemble into highly ordered body-centered tetragonal ... [more ▼]

Grazing incidence small-angle scattering,and electron microscopy have been used to show for the first time that nonspherical nanoparticles can assemble into highly ordered body-centered tetragonal mesocrystals. Energy models accounting for the directionality and magnitude of the van der Waals and dipolar interactions as a function of the degree of truncation of the nanocubes illustrated the importance of the directional dipolar forces for the formation of the initial nanocube clusters and the dominance of the van der Waals multibody interactions in the dense packed arrays. [less ▲]

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See detailLigand and Solvation Effects on the Electronic Properties of Au-55 Clusters: A Density Functional Theory Study
Periyasamy, Ganga ULg; Remacle, Françoise ULg

in Nano Letters (2009), 9(8), 3007-3011

The electronic properties of the neutral, positively and negatively charged bare Au-55, passivated Au-55(PH3)(12), Au-55(PH3)(12)Cl-6, and solvated Au-55(PH3)(12)Cl-6 54 H2O clusters are studied using ... [more ▼]

The electronic properties of the neutral, positively and negatively charged bare Au-55, passivated Au-55(PH3)(12), Au-55(PH3)(12)Cl-6, and solvated Au-55(PH3)(12)Cl-6 54 H2O clusters are studied using density functional theory. The presence of Cl atoms in the ligand shell favors a nonmetallic behavior while a more metallic behavior is induced by explicit solvation of Au-55(PH3)(12)Cl-6 with water molecules. The trends observed in the electronic properties upon ligation and solvation are in agreement with experimental studies, [less ▲]

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See detailQuantitative Structural Analysis of Binary Nanocrystal Superlattices by Electron Tomography
Friedrich, Heiner; Gommes, Cédric ULg; Overgaag, Karin et al

in Nano Letters (2009), 9

Binary nanocrystal superlattices, that is, ordered structures of two sorts of nanocolloids, hold promise for a series of functional materials with novel collective properties. Here we show that based on ... [more ▼]

Binary nanocrystal superlattices, that is, ordered structures of two sorts of nanocolloids, hold promise for a series of functional materials with novel collective properties. Here we show that based on electron tomography a comprehensive, quantitative, three-dimensional characterization of these systems down to the single nanocrystal level can be achieved, which is key in understanding the emerging materials properties. On four binary lattices composed of PbSe, CdSe, and Au nanocrystals, we illustrate that ambiguous interpretations based on two-dimensional transmission electron microscopy can be prevented, nanocrystal sizes and superlattice parameters accurately determined, individual crystallographic point and plane defects studied, and the order/disorder at the top and bottom surfaces imaged. Furthermore, our results suggest that superlattice nucleation and growth occurred at the suspension/air interface and that the unit cells of some lattices are anisotropically deformed upon drying. [less ▲]

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See detailPlasmonic Ratchet Wheels: Switching Circular Dichroism by Arranging Chiral Nanostructures
Valev, V. K.; Smisdom, N.; Silhanek, Alejandro ULg et al

in Nano Letters (2009), 9(11), 3945-3948

We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon ... [more ▼]

We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon reordering them the SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate in enantiomerically sensitive plasmon modes, having the novel property of exhibiting a chiral geometry themselves in relation with the handedness of the material. These results open new frontiers in studying chirality. [less ▲]

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See detailExperimental and theoretical studies suggesting the possibility of metallic boron nitride edges in porous nanourchins
Terrones, M.; Charlier, Jean-Christophe; Gloter, A. et al

in Nano Letters (2008), 8(4), 1026-1032

We first describe the synthesis of novel and highly porous boron nitride (BN) nanospheres (100–400 nm o.d.) that exhibit a rough surface consisting of open BN nanocones and corrugated BN ribbons. The ... [more ▼]

We first describe the synthesis of novel and highly porous boron nitride (BN) nanospheres (100–400 nm o.d.) that exhibit a rough surface consisting of open BN nanocones and corrugated BN ribbons. The material was produced by reacting B2O3 with nanoporous carbon spheres under nitrogen at ca. 1750 °C. The BN nanospheres were characterized using scanning electron microscopy, high-resolution electron microscopy, and electron energy loss spectroscopy. The porous BN spheres show relatively large surface areas of ca. 290 m2/g and exhibit surprisingly stable field emission properties at low turn-on voltages (e.g., 1–1.3 V/µm). We attribute these outstanding electron emission properties to the presence of finite BN ribbons located at the surface of the nanospheres (exhibiting zigzag edges), which behave like metals as confirmed by first-principles calculations. In addition, our ab initio theoretical results indicate that the work function associated to these zigzag BN ribbons is 1.3 eV lower when compared with BN-bulk material. [less ▲]

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See detailTranscending binary logic by gating three coupled quantum dots
Klein, M.; Rogge, S.; Remacle, Françoise ULg et al

in Nano Letters (2007), 7

Physical considerations supported by numerical solution of the quantum dynamics including electron repulsion show that three weakly coupled quantum dots can robustly execute a complete set of logic gates ... [more ▼]

Physical considerations supported by numerical solution of the quantum dynamics including electron repulsion show that three weakly coupled quantum dots can robustly execute a complete set of logic gates for computing using three valued inputs and outputs. Input is coded as gating (up, unchanged, or down) of the terminal dots. A nanosecond time scale switching of the gate voltage requires careful numerical propagation of the dynamics. Readout is the charge (0, 1, or 2 electrons) on the central dot. [less ▲]

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