Controlled fabrication of single electron transistors from single-walled carbon nanotubes

Paul Stokes and Saiful I. Khondaker
Single electron transistors (SETs) are fabricated by placing single-walled carbon nanotubes (SWNTs) on a 100 nm wide local Al/AlO bottom gate and then contacting with Pd electrodes. Coulomb oscillations up to 125 K were observed and charging energies of 1215 meV with level spacing of ~5 meV were ... [Appl. Phys. Lett. 92, 262107 (2008)] published Thu Jul 3, 2008.

Single-layer metallodielectric nanostructures as dual-band midinfrared filters

Yan Tang, Jeremy A. Bossard, Douglas H. Werner, and Theresa S. Mayer
We report a design and fabrication strategy for creating single-layer metallodielectric nanostructures with dual-band filtering properties at midinfrared wavelengths. Genetic algorithm optimization was used to determine an arrangement of nanometer-scale metal pixels within one unit cell of a two-dim ... [Appl. Phys. Lett. 92, 263106 (2008)] published Wed Jul 2, 2008.

Three-dimensional magnetic microstructures fabricated by microstereolithography

Kengo Kobayashi and Koji Ikuta
Our group has developed a magnetically modified photocurable polymer for use in microstereolithography to fabricate magnetic microstructures and microactuators having three-dimensionally complex structures. This polymer is prepared by mixing a photocurable polymer with magnetic particles together wi ... [Appl. Phys. Lett. 92, 262505 (2008)] published Wed Jul 2, 2008.

Preparation of nanochain and nanosphere by self-assembly of gold nanoparticles

C. Fang, Y. Fan, J. M. Kong, Z. Q. Gao, and N. Balasubramanian
A self-assembly method is demonstrated to link nanoparticles into nanostructure of nanochain or nanosphere. Gold nanoparticles were covered with capping molecules by forming AuS bonds with thiol group at one terminate. Another terminating group, carboxylic acid, showed strong complex interaction wit ... [Appl. Phys. Lett. 92, 263108 (2008)] published Wed Jul 2, 2008.

Dipole-induced self-assembly of helical beta-peptides

Clark A. Miller, Juan P. Hernandez-Ortiz, Nicholas L. Abbott, Samuel H. Gellman, and Juan J. de Pablo
In this work, the interactions between beta-peptides are investigated for helix-forming peptides using molecular simulation. The role of electrostatic interactions in the self-assembly of these peptides is studied by calculating the dipole moment of various 14-helical beta-peptides using molecular d ... [J. Chem. Phys. 129, 015102 (2008)] published Wed Jul 2, 2008.

Dipole-induced self-assembly of helical beta-peptides

Clark A. Miller, Juan P. Hernandez-Ortiz, Nicholas L. Abbott, Samuel H. Gellman, and Juan J. de Pablo
In this work, the interactions between beta-peptides are investigated for helix-forming peptides using molecular simulation. The role of electrostatic interactions in the self-assembly of these peptides is studied by calculating the dipole moment of various 14-helical beta-peptides using molecular d ... [J. Chem. Phys. 129, 015102 (2008)] published Wed Jul 2, 2008.

Probing the Morphology and Energy Landscape of Blends of Conjugated Polymers with Sub-10 nm Resolution

Sebastian Westenhoff, Ian A. Howard, and Richard H. Friend
We have investigated the charge generation dynamics in intimately mixed blends of polyfluorene copolymers optimized for photocurrent generation. Using femtosecond transient absorption spectroscopy, we find that the charge generation time is limited by exciton diffusion to the interface. Combined wit ... [Phys. Rev. Lett. 101, 016102 (2008)] published Wed Jul 2, 2008.

Exotic shapes of gold nanoparticles synthesized using plasma in aqueous solution

Junko Hieda, Nagahiro Saito, and Osamu Takai
Gold nanoparticles with exotic shapes, such as triangle, pentagon, and hexagon, have been synthesized by glow discharge in aqueous solutions. A pulsed power supply was used to generate discharges in the aqueous solutions. Pulse width and frequency were 2 [mu]s and 15 kHz, respectively. Discharges w ... [J. Vac. Sci. Technol. A 26, 854 (2008)] published Tue Jul 1, 2008.

Preparation of nickel nanoparticles and their catalytic activity in the cracking of methane

Juan Carlos De Jesus, Ismael Gonzalez, Miguel Garcia, and Caribay Urbina
Metallic nickel nanoparticles are excellent catalysts for the cracking of methane into carbon nanotubes and hydrogen. Decomposition of tetrahydrate nickel acetate proceeds readily in inert or hydrocarbon streams to produce metallic nickel agglomerates (average size of 1080 nm) at around 350 degre ... [J. Vac. Sci. Technol. A 26, 913 (2008)] published Tue Jul 1, 2008.

Effect of swift heavy ion irradiation on the hardness of chromium nanorods

Rupali Nagar, B. R. Mehta, J. P. Singh, D. Jain, V. Ganesan et al.
The present study reports the use of swift heavy ion irradiation as a means to tailor the hardness of chromium nanorod coatings. Arrays of slanted and straight Cr nanorods, 12 [mu]m long and 300500 nm in diameter, were grown by dc magnetron sputter glancing angle deposition on Si(100) substrates p ... [J. Vac. Sci. Technol. A 26, 887 (2008)] published Tue Jul 1, 2008.

Growth and characterization of carbon nanotubes on constantan (Cu--Ni--Mn alloy) metallic substrates without adding additional catalysts

C. V. Varanasi, J. Bulmer, L. Brunke, J. Burke, J. Baca et al.
In this study, metallic constantan (Cu55Ni44Mn1 wt %) alloy substrates were investigated as an alternate choice of substrates to grow carbon nanotubes (CNTs). No additional catalysts were used other than the as-rolled and annealed substrates to process CNTs on them. High density CNT growth was obs ... [J. Vac. Sci. Technol. A 26, 832 (2008)] published Tue Jul 1, 2008.

Nanometer-scaled triangular platinum islands fabricated using the bridge phenomenon of polystyrene beads

Byoung-Kyu Lee, Kyoung Seob Kim, Ji-Hye Lee, Nam-Hoon Kim, and Yonghan Roh
The authors optimized the fabrication of nanometer-scaled triangular platinum islands using the bridge phenomenon of polystyrene beads. Both the mixture ratio of polystyrene beads and the spin coating process were optimized to array a uniform monolayer of polystyrene beads at a high density over a l ... [J. Vac. Sci. Technol. A 26, 819 (2008)] published Tue Jul 1, 2008.

Growth of InAs/Sb:GaAs quantum dots on silicon substrate with high density and efficient light emission in the 1.3 mu m band

Lin Li, Denis Guimard, Mohan Rajesh, and Yasuhiko Arakawa
We report on the growth of self-assembled InAs/Sb:GaAs quantum dots (QDs) on silicon substrate by antimony-mediated metal organic chemical vapor deposition. We obtained arrays of InAs/Sb:GaAs/Si QD chains along [011], with density as high as 7 x 10 cm and low coalescence. These QDs yield emission i ... [Appl. Phys. Lett. 92, 263105 (2008)] published Tue Jul 1, 2008.

Monocrystalline Al[sub x]Ga[sub 1 - x]As heterostructures for high-reflectivity high-Q micromechanical resonators in the megahertz regime

Garrett D. Cole, Simon Groblacher, Katharina Gugler, Sylvain Gigan, and Markus Aspelmeyer
We present high-performance megahertz micromechanical oscillators based on freestanding epitaxial AlGaAs distributed Bragg reflectors. Compared with dielectric reflectors, the low mechanical loss of the monocrystalline heterostructure gives rise to significant improvements in the achievable mechanic ... [Appl. Phys. Lett. 92, 261108 (2008)] published Tue Jul 1, 2008.

Superior nanoscale passive oxide layers synthesized under photon irradiation for environmental protection

Chia-Lin Chang, Mark H. Engelhard, and Shriram Ramanathan
We report on synthesis and functional properties of ultrathin oxide layers synthesized on metal surfaces by room temperature photon irradiation. We show that the impedance of a passive aluminum oxide film synthesized under ultraviolet photon irradiation is an order of magnitude larger than that of n ... [Appl. Phys. Lett. 92, 263103 (2008)] published Tue Jul 1, 2008.

Mechanism of critical catalyst size effect on MgO nanowire growth by pulsed laser deposition

Takeshi Yanagida, Kazuki Nagashima, Hidekazu Tanaka, and Tomoji Kawai
The size controllability of oxide nanowires formed via vapor-liquid-solid (VLS) mechanism is desired for the oxide nanowire-based device applications. However, the complex nature of oxide nanowire VLS growth has held back such size controllability. Here we demonstrate the critical size effect of a A ... [J. Appl. Phys. 104, 016101 (2008)] published Tue Jul 1, 2008.

Quantum Conductance Oscillations in Metal/Molecule/Metal Switches at Room Temperature

Feng Miao, Douglas Ohlberg, Duncan R. Stewart, R. Stanley Williams, and Chun Ning Lau
We apply pressure-modulated conductance microscopy to metal/molecule/metal switches. Apart from pressure-induced conductance peaks that indicate nanoscale conducting pathways, we also observe dips and oscillations for devices with conductance between 1 and 2 conductance quantum. The conductance osci ... [Phys. Rev. Lett. 101, 016802 (2008)] published Tue Jul 1, 2008.

Testing the consistency of the Maxwell–Stefan formulation when predicting self-diffusion in zeolites with strong adsorption sites
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Single-wall carbon nanotube synthesis by CO disproportionation on nickel-incorporated MCM-41
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Large- and small-nanopore silica prepared with a short-chain cationic fluorinated surfactant
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Polymeric worm micelles as nano-carriers for drug delivery
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Dendrimer-mediated synthesis of platinum nanoparticles: new insights from dialysis and atomic force microscopy measurements
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Adhesion of Pseudomonas fluorescens onto nanophase materials
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Engineering nanospaces: ordered mesoporous silicas as model substrates for building complex hybrid materials
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Electrical transport, Meyer–Neldel rule and oxygen sensitivity of Bi2S3
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Structural and optical characterizations of multi-layered and multi-stacked PbSe quantum dots
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Single-step synthesis of well-crystallized and pure barium titanate nanoparticles in supercritical fluids
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Contacting gold nanoparticles with carbon nanotubes by self-assembly
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Single-crystalline MgxZn1-xO (0≤x≤0.25) nanowires on glass substrates obtained by a hydrothermal method: growth, structure and
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Self-assembly of ZnO nanoparticles to electrostatic coordination sites of functionalized carbon nanotubes
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Effects of passivation and ambient gases on the photoluminescence of ZnSe nanowires
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Synthesis of gram-scale germanium nanocrystals by a low-temperature inverse micelle solvothermal route
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Random capacitance modulation due to charging/discharging in Si nanocrystals embedded in gate dielectric
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Control of the two-dimensional–three-dimensional transition of self-organized CdSe/ZnSe quantum dots
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Synthesis of photoconducting ZnO nano-needles using an unbalanced magnetron sputtered ZnO/Zn/ZnO multilayer structure
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Fabrication of metal nanowires by atomic force microscopy nanoscratching and lift-off process
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A new organometallic synthesis of size-controlled tin(0) nanoparticles
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A batch fabricated biomimetic dry adhesive
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Sub-10 nanometre fabrication: molecular templating, electron-beam sculpting and crystallization of metallic nanowires
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