References of "Nano Letters"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailA Probabilistic Finite State Logic Machine Realized Experimentally on a Single Dopant Atom
Fresch, Barbara; Bocquel, Juanita; Rogge, Sven et al

in Nano Letters (2017), 17

Exploiting the potential of nanoscale devices for logic processing requires the implementation of computing functionalities departing from the conventional switching paradigm. We report on the design and ... [more ▼]

Exploiting the potential of nanoscale devices for logic processing requires the implementation of computing functionalities departing from the conventional switching paradigm. We report on the design and the experimental realisation of a probabilistic finite state machine in a single phosphorus donor atom placed in a silicon matrix electrically addressed and probed by Scanning Tunneling Spectroscopy (STS). The single atom logic unit simulates the flow of visitors in a maze whose topology is determined by the dynamics of the electronic transport through the states of the dopant. By considering the simplest case of a unique charge state for which three electronic states can be resolved, we demonstrate an efficient solution of the following problem: in a maze of four connected rooms, what is the optimal combination of door opening rates in order to maximize the time that visitors spend in one specific chamber? The implementation takes advantage of the stochastic nature of electron tunneling while the output remains the macroscopic current whose reading can be realized with standard techniques and does not require single electron sensitivity. [less ▲]

Detailed reference viewed: 13 (1 ULiège)
Full Text
Peer Reviewed
See detailDirect Imaging of the Onset of Electrical Conduction in Silver Nanowire Networks by Infrared Thermography: Evidence of Geometrical Quantized Percolation
Sannicolo, Thomas; Munoz-Rojas, David; Nguyen, Ngoc Duy ULiege et al

in Nano Letters (2016), 16

Advancement in the science and technology of random metallic nanowire (MNW) networks is crucial for their appropriate integration in many applications, including transparent electrodes for optoelectronics ... [more ▼]

Advancement in the science and technology of random metallic nanowire (MNW) networks is crucial for their appropriate integration in many applications, including transparent electrodes for optoelectronics and transparent film heaters. We have recently highlighted the discontinuous activation of efficient percolating pathways (EPPs) for networks having densities slightly above the percolation threshold. Such networks exhibit abrupt drops of electrical resistance when thermal or electrical annealing is performed, giving rise to a “geometrically quantized percolation”. In this letter, Lock-in Thermography (LiT) is used to provide visual evidence of geometrical quantized percolation: when low voltage is applied to the network, individual “illuminated pathways” can be detected and new branches get highlighted as the voltage is incrementally increased. This experimental approach has allowed us to validate our original model and map the electrical and thermal distributions in silver nanowire (AgNW) networks. We also study the effects of electrode morphology and wire dimensions on quantized percolation. Furthermore we demonstrate that the network failure at high temperature can also be governed by a quantized increase of the electrical resistance, corresponding to the discontinuous destruction of individual pathways (anti-percolation). More generally, we demonstrate that LiT is as a promising tool for the detection of conductive sub-clusters, as well as hot spots in AgNW networks. [less ▲]

Detailed reference viewed: 28 (4 ULiège)
Full Text
Peer Reviewed
See detailHigh Temperature Ferromagnetism in a GdAg2 Monolayer
Ormaza, M.; Fernandez, L.; Ilyn, M. et al

in Nano Letters (2016), 0(0),

Detailed reference viewed: 161 (4 ULiège)
Full Text
Peer Reviewed
See detailAssembly of Ligand-Stripped Nanocrystals into Precisely Controlled Mesoporous Architectures
Buonsanti, R.; Pick, T. E.; Krins, Natacha ULiege et al

in Nano Letters (2012), 12

Detailed reference viewed: 22 (3 ULiège)
Full Text
Peer Reviewed
See detailpH-Programmable DNA Logic Arrays Powered by Modular DNAzyme Libraries
Elbaz, J.; Wang, F.; Remacle, Françoise ULiege et al

in Nano Letters (2012)

Detailed reference viewed: 28 (1 ULiège)
Full Text
Peer Reviewed
See detailShape Induced Symmetry in Self-Assembled Mesocrystals of Iron Oxide Nanocubes
Disch, Sabrina; Wetterskog, Erik; Hermann, Raphaël ULiege 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 ▲]

Detailed reference viewed: 23 (0 ULiège)
Full Text
Peer Reviewed
See detailGrowth of Straight InAs-on-GaAs Nanowire Heterostructures
Messing, Maria E; Wong-Leung, Jennifer; Zanolli, Zeila ULiege 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 ▲]

Detailed reference viewed: 60 (3 ULiège)
Full Text
Peer Reviewed
See detailLigand and Solvation Effects on the Electronic Properties of Au-55 Clusters: A Density Functional Theory Study
Periyasamy, Ganga ULiege; Remacle, Françoise ULiege

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 ▲]

Detailed reference viewed: 34 (3 ULiège)
Full Text
Peer Reviewed
See detailPlasmonic Ratchet Wheels: Switching Circular Dichroism by Arranging Chiral Nanostructures
Valev, V. K.; Smisdom, N.; Silhanek, Alejandro ULiege 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 ▲]

Detailed reference viewed: 32 (2 ULiège)
Full Text
Peer Reviewed
See detailQuantitative Structural Analysis of Binary Nanocrystal Superlattices by Electron Tomography
Friedrich, Heiner; Gommes, Cédric ULiege; 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 ▲]

Detailed reference viewed: 54 (1 ULiège)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 14 (0 ULiège)
Full Text
Peer Reviewed
See detailTranscending binary logic by gating three coupled quantum dots
Klein, M.; Rogge, S.; Remacle, Françoise ULiege 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 ▲]

Detailed reference viewed: 39 (4 ULiège)