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4 Jan 2010

Volume 96, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 96, 013107 (2010); http://dx.doi.org/10.1063/1.3280900 (3 pages)

L. Fernández, M. Corso, F. Schiller, M. Ilyn, M. Holder, and J. E. Ortega
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Assembly of gold nanoparticles of different diameters between nanogap electrodes

Donguk Cheon, Sanjeev Kumar, and Gil-Ho Kim

Appl. Phys. Lett. 96, 013101 (2010); http://dx.doi.org/10.1063/1.3280859 (3 pages) | Cited 6 times

Online Publication Date: 4 January 2010

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Gold nanoparticles (NPs) of different diameters i.e., 5, 10, and 20 nm, were assembled between 20 nm gap electrodes using ac dielectrophoresis (DEP) process. DEP parameters, such as frequency, trapping time, and voltage of value 1 MHz, 1 s, and 2–3 V, respectively, led to the pearl-chain assembly corresponding to each type of NPs between 20 nm gap electrodes. Mutual DEP could be attributed to the NPs chaining in low field regions and subsequently the DEP force directs these chains to the trapping region. Such controlled assembly of individual NPs may find application in fabricating devices for molecular electronics.
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81.07.Bc Nanocrystalline materials
81.05.Bx Metals, semimetals, and alloys
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.16.-c Methods of micro- and nanofabrication and processing
82.45.Fk Electrodes
85.35.-p Nanoelectronic devices

Exchange bias in large three dimensional iron oxide nanocomposites

J. R. Morales, S. Tanju, W. P. Beyermann, and J. E. Garay

Appl. Phys. Lett. 96, 013102 (2010); http://dx.doi.org/10.1063/1.3277147 (3 pages) | Cited 4 times

Online Publication Date: 4 January 2010

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A processing method is presented for the production of macroscopic nanocomposites that display antiferromagnetic/ferrimagnetic (AFM/fM) coupling. The technique takes advantage of the metastability of iron oxide phases and the fast densification of nanocrystalline powders. The total processing time is under 500s. It is possible to manipulate the composition of fM and AFM phases with processing temperature. The relatively high density of AFM/fM boundaries produces an exchange bias caused by coupling at the interfaces. The magnitude of the exchange field (Hex) is affected the composition as well as the grain size; the smaller grain size samples have the highest Hex.
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75.50.Tt Fine-particle systems; nanocrystalline materials
81.16.-c Methods of micro- and nanofabrication and processing
81.07.Wx Nanopowders
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
75.50.Gg Ferrimagnetics
75.50.Ee Antiferromagnetics

Characterization of the junction capacitance of metal-semiconductor carbon nanotube Schottky contacts

Yu-Chih Tseng and Jeffrey Bokor

Appl. Phys. Lett. 96, 013103 (2010); http://dx.doi.org/10.1063/1.3277182 (3 pages) | Cited 3 times

Online Publication Date: 5 January 2010

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Capacitance-voltage measurements have been performed on individual metal-carbon nanotube (CNT) Schottky diodes. The capacitance is found to agree in general with electrostatic simulations, taking into account the one-dimensional density of states of the CNT, and depends strongly on the Schottky barrier height and the diameter of the nanotube. The results indicate that the capacitance-voltage technique can be extended to characterize electrical junctions with very small area.
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73.30.+y Surface double layers, Schottky barriers, and work functions
73.40.Ns Metal-nonmetal contacts
73.22.-f Electronic structure of nanoscale materials and related systems

Monodispersed cation-disordered cubic AgInS2 nanocrystals with enhanced fluorescence

Zhenyu Feng, Pengcheng Dai, Xicheng Ma, Jinhua Zhan, and Zhaojun Lin

Appl. Phys. Lett. 96, 013104 (2010); http://dx.doi.org/10.1063/1.3280372 (3 pages) | Cited 7 times

Online Publication Date: 6 January 2010

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Monodispersed metastable cubic AgInS2 nanocrystals with an average size of around 2.5 nm are obtained via a solution-phase reaction. In contrast with the usual chalcopyrite and orthorhombic phase, Ag+ and In3+ cations in metastable cubic AgInS2 are randomly coordinated by four S2− anions. A phase transition from cation-disordered cubic to orthorhombic AgInS2 occurs with the increased reaction temperature or elongated reaction time. The photoluminescence quantum yield of cation-disordered cubic AgInS2 nanocrystals could reach 10% at room temperature, which is much higher than that of orthorhombic AgInS2 nanocrystals obtained via a similar approach.
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78.55.Hx Other solid inorganic materials
81.05.Hd Other semiconductors
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
64.70.kg Semiconductors
81.07.Bc Nanocrystalline materials

Strain-induced lateral self-organization in Si/SiO2 nanostructures

L. Tsybeskov, B. V. Kamenev, A. A. Sirenko, J. P. McCaffrey, and D. J. Lockwood

Appl. Phys. Lett. 96, 013105 (2010); http://dx.doi.org/10.1063/1.3290250 (3 pages) | Cited 1 time

Online Publication Date: 6 January 2010

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We show that strain, arising from the mismatch between Si and SiO2 thermal expansion coefficients, directs the thermal crystallization of amorphous Si along Si/SiO2 interfaces, and produces continuous, fully crystallized nanometer thick Si layers with a lateral-to-vertical aspect ratio close to 100:1. These Si nanolayers exhibit a low density of structural defects and are found to be elastically strained with respect to the crystal Si substrate.
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81.16.-c Methods of micro- and nanofabrication and processing
61.72.Mm Grain and twin boundaries
81.07.Bc Nanocrystalline materials
65.80.-g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems
81.40.Jj Elasticity and anelasticity, stress-strain relations
64.70.dg Crystallization of specific substances

High efficiency green, yellow, and amber emission from InGaN/GaN dot-in-a-wire heterostructures on Si(111)

Y.-L. Chang, J. L. Wang, F. Li, and Z. Mi

Appl. Phys. Lett. 96, 013106 (2010); http://dx.doi.org/10.1063/1.3284660 (3 pages) | Cited 14 times

Online Publication Date: 6 January 2010

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The authors report on the achievement of nearly defect-free, vertically aligned InGaN/GaN dot-in-a-wire nanoscale heterostructures grown directly on Si(111) substrates by molecular beam epitaxy. Strong green, yellow, and amber emission, with a room temperature internal quantum efficiency of ∼ 45% of that measured at low temperature ( ∼ 10 K), was achieved. Detailed structural and optical studies further confirm that the emission characteristics are strongly influenced by the presence of In-rich nanoclusters, formed by phase segregation, in the InGaN dots.
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78.55.Cr III-V semiconductors
64.75.Qr Phase separation and segregation in semiconductors
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
78.67.Hc Quantum dots
78.67.Lt Quantum wires

Self-organized growth of high density magnetic Co nanodot arrays on a Moiré template

L. Fernández, M. Corso, F. Schiller, M. Ilyn, M. Holder, and J. E. Ortega

Appl. Phys. Lett. 96, 013107 (2010); http://dx.doi.org/10.1063/1.3280900 (3 pages) | Cited 3 times

Online Publication Date: 6 January 2010

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We report the self-organized growth of cobalt nanodot arrays using a Gd-Au Moiré superlattice as a template. After analyzing the influence of the Co flux and the substrate temperature, we obtain the suitable parameters to maximize nanodot density, homogeneity, and individual size. Depending on the growth conditions an areal density of up to 54 Teradots/inch2 can be achieved. Below the limit of lateral coalescence, independent nanodots made of ∼ 1000 Co atoms exhibit room temperature remanent magnetization.
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81.16.Dn Self-assembly
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.07.Bc Nanocrystalline materials
75.75.Cd Fabrication of magnetic nanostructures

Bimetallic Fe–V catalyzed magnesium films exhibiting rapid and cycleable hydrogenation at 200 °C

Beniamin Zahiri, Babak Shalchi Amirkhiz, Mohsen Danaie, and David Mitlin

Appl. Phys. Lett. 96, 013108 (2010); http://dx.doi.org/10.1063/1.3275864 (3 pages) | Cited 8 times

Online Publication Date: 7 January 2010

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We examined hydrogen sorption in 1.5 μm thick Mg–Fe–V films, using the binary alloys as baselines. At 200 °C both Mg–V and Mg–Fe–V absorb in tens of seconds, and desorb in tens of minutes. The ternary alloys show minimal kinetic or capacity degradation even after 105 absorption/desorption cycles. Pressure—composition isotherms yield the well-known enthalpies of α-MgH2 formation (decomposition), agreeing with x-ray diffraction results. The x-ray spectrum also shows a broad hump centered near (011) reflection of CsCl-type Fe–V phase. Our hypothesis is that a densely distributed nanoscale Fe–V acts both as a potent hydrogen dissociation catalyst and a heterogeneous nucleation site.
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82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
68.43.Nr Desorption kinetics
82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)
82.60.Cx Enthalpies of combustion, reaction, and formation
68.55.jd Thickness
82.60.Nh Thermodynamics of nucleation

Roller-style electrostatic printing of prepatterned few-layer-graphenes

Xiaogan Liang, Valentina Giacometti, Ariel Ismach, Bruce D. Harteneck, Deirdre L. Olynick, and Stefano Cabrini

Appl. Phys. Lett. 96, 013109 (2010); http://dx.doi.org/10.1063/1.3291037 (3 pages) | Cited 4 times

Online Publication Date: 8 January 2010

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Electrostatic exfoliation of patterned few-layer-graphenes was demonstrated using a method compatible with high throughput roll-to-roll manufacturing. A patterned graphite template was placed on a roller and used to exfoliate patterned graphene on a planar substrate. The exfoliated graphene features were subsequently characterized by Raman spectroscopy. In comparison with previously demonstrated planar electrostatic exfoliation approach, the roller-style method can create a narrower distribution of thickness of few-layer-graphenes, which is attributed to the combinational action of tangential rolling friction and electrostatic forces. This roller-style electrostatic printing technique could be applied for roll-to-roll manufacturing of graphene-based devices in the future.
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81.16.Rf Micro- and nanoscale pattern formation
78.30.Hv Other nonmetallic inorganics
62.20.Qp Friction, tribology, and hardness
81.40.Pq Friction, lubrication, and wear

Measurement of thermopower and current-voltage characteristics of molecular junctions to identify orbital alignment

Aaron Tan, Seid Sadat, and Pramod Reddy

Appl. Phys. Lett. 96, 013110 (2010); http://dx.doi.org/10.1063/1.3291521 (3 pages) | Cited 19 times

Online Publication Date: 8 January 2010

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We report an experimental technique that concurrently measures the Seebeck coefficient and the current-voltage (I-V) characteristics of a molecular junction to determine the identity and the effective energetic separation of the molecular orbital closest to the electrodes’ Fermi level. Junctions created by contacting a gold-coated atomic force microscope tip with a monolayer of molecules assembled on a gold substrate were found to have a Seebeck coefficient of (+16.9±1.4) μV/K. This positive value unambiguously shows that the highest occupied molecular orbital (HOMO) dominates charge transport. Further, by analyzing the (I-V) characteristics, the HOMO level is estimated to be ∼ 0.69 eV with respect to the Fermi level.
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73.40.Rw Metal-insulator-metal structures
85.65.+h Molecular electronic devices
68.37.Ps Atomic force microscopy (AFM)
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