Prediction of the Thermal Conductivity of ZnO Nanostructures
P. Chantrenne and C. Ould-Lahoucine
The kinetic theory of gas is used to predict the specific heat and thermal conductivity of ZnO nanostructures. In this model, phonons are considered as a gas whose basic properties are given by phonon dispersion curves. The model also requires knowledge of the boundary relaxation time parameter (F), ... [J. Heat Transfer 134, 042401 (2012)] published Mon Feb 13, 2012.
Influence of Nanomaterials in Polymer Composites on Thermal Conductivity
Wonchang Park, Kyungwho Choi, Khalid Lafdi, and Choongho Yu
Carbon nanotube- or/and graphite-filled polymer composites were synthesized by using simple mixing and drying methods, and their thermal conductivities and structures were characterized by using a steady-state method (ASTM D5470) and scanning and transmission electron microscopies. In order to inves ... [J. Heat Transfer 134, 041302 (2012)] published Mon Feb 13, 2012.
Magnetovolume effect in HoFeMn compounds
J. L. Wang, A. J. Studer, S. J. Kennedy, R. Zeng, S. X. Dou et al.
The structural and magnetic properties of seven compounds in the HoFeMn series (x = 0-5) have been investigated. The spontaneous magnetization M at 10 K exhibits a minimum at x [approximate] 3.8 while the 3d-sublattice magnetization M is found to decrease at ~ 3.4 [mu]/per Mn atom compared with the ... [J. Appl. Phys. 111, 07A911 (2012)] published Mon Feb 13, 2012.
Bending of metal-filled carbon nanotube under electron beam irradiation
Abha Misra
Electron beam irradiation induced, bending of Iron filled, multiwalled carbon nanotubes is reported. Bending of both the carbon nanotube and the Iron contained within the core was achieved using two approaches with the aid of a high resolution electron microscope (HRTEM). In the first approach, bend ... [AIP Advances 2, 012142 (2012)] published Mon Feb 13, 2012.
Solid-state source of atomic oxygen for low-temperature oxidation processes: Application to pulsed laser deposition of TiO:N films
Daiki Ojima, Tetsuya Chiba, Kazunari Shima, Hidenori Hiramatsu, Hideo Hosono et al.
An atomic oxygen (AO) source has been redesigned to coordinate with a pulsed laser deposition system and used to grow nitrogen-doped TiO films by deposition of TiN and simultaneous irradiation of the substrate with AO. The AO source uses an incandescently heated thin tube of zirconia as an oxygen pe ... [Rev. Sci. Instrum. 83, 023903 (2012)] published Mon Feb 13, 2012.
Comment on Forming-free resistive switching behavior in NdO, DyO, and ErO films fabricated in full room temperature [Appl. Phys. Lett. 99, 113509 (2011)]
V. V. Atuchin
Abstract not available. [Appl. Phys. Lett. 100, 076101 (2012)] published Mon Feb 13, 2012.
Top-gated germanium nanowire quantum dots in a few-electron regime
Sung-Kwon Shin, Shaoyun Huang, Naoki Fukata, and Koji Ishibashi
Top gated quantum dots (QDs) have been fabricated from n-type chemically synthesized germanium nanowires (GeNWs) by constricting its length with metal electrode contacts. With an intermediate HfO thin film, the constricted GeNW was fully covered by an Omega-shaped top-gate. The QD was probed and cha ... [Appl. Phys. Lett. 100, 073103 (2012)] published Mon Feb 13, 2012.
Strain relaxation analysis of LaAlO/SrTiO heterostructure using reciprocal lattice mapping
Wei Wei and Alp Sehirlioglu
Strain-relaxation in LaAlO/SrTiO heterostructures was systematically investigated with LaAlO film thickness in the range 4.9-84 nm. Heterostructures were characterized using reciprocal lattice mapping (RLM), high resolution rocking curve, and x-ray reflectivity. RLM enables the measurement of lattic ... [Appl. Phys. Lett. 100, 071901 (2012)] published Mon Feb 13, 2012.
Drawing graphene nanoribbons on SiC by ion implantation
S. Tongay, M. Lemaitre, J. Fridmann, A. F. Hebard, B. P. Gila et al.
We describe a straightforward technique for selective graphene growth and nanoribbon production onto 4H- and 6H-SiC. The technique presented is as easy as ion implanting regions where graphene layers are desired followed by annealing to 100 degrees C below the graphitization temperature (T) of SiC. ... [Appl. Phys. Lett. 100, 073501 (2012)] published Mon Feb 13, 2012.
CuO/ZnO Nanocomposites Investigated by X-ray Photoelectron and X-ray Excited Auger Electron Spectroscopies
Quentin Simon, Davide Barreca, and Alberto Gasparotto
Supported CuO/ZnO nanocomposites were prepared by a novel bottom-up approach, consisting of: i) deposition of columnar ZnO arrays on Si(100) by Plasma Enhanced-Chemical Vapor Deposition (PE-CVD) using a Zn(II) bis(ketoiminate) precursor; ii) Radio Frequency (RF)-sputtering of Cu in Ar atmospheres. F ... [Surf. Sci. Spectra 17, 93 (2012)] published Mon Feb 13, 2012.
Advanced nanodiamond emitter with pyramidal tip-on-pole structure for emission self-regulation
Anurat Wisitsora-at, Shao-Hua Hsu, Weng P. Kang, Jimmy L. Davidson, and Adisorn Tuantranont
In this paper, we report an innovative nanodiamond field emitter structure consisting of an individual pyramidal tip sitting on top of a ballast resistor pole. The tip-on-pole nanodiamond structures are fabricated by a new mold transfer process that is comprised of reactive-ion-etching of 3.5 [mu]m- ... [J. Vac. Sci. Technol. B 30, 022204 (2012)] published Mon Feb 13, 2012.
Modeling of the microstructure of carbon nanotube with two nonlocal elasticity theories
S. Basir Jafari, R. Malekfar, and S. E. Khadem
In this paper, a detailed theoretical study on the dispersion of waves in carbon nanotubes (CNTs) is presented. For this purpose, CNTs are considered as nonlocal elastic thin cylindrical shells. The Eringen's nonlocal elasticity theory is used for modeling the microstructure of CNT such that the pro ... [J. Appl. Phys. 111, 034315 (2012)] published Mon Feb 13, 2012.
Ohmic electromechanical dissipation in nanomechanical cantilevers
T. Barois, A. Ayari, A. Siria, S. Perisanu, P. Vincent et al.
We study the contribution of ohmic dissipation to the mechanical damping of nanoresonators. This damping occurs when DC voltage is applied to a resistive resonator, because the mechanical motion modifies the associated capacitance, thus inducing a dissipative current. Silicon carbide nanowire resona ... [Phys. Rev. B 85, 075407 ] published .
Strain analysis of a wrinkled SiGe bilayer thin film
Guo-En Chang, Chia-Ou Chang, and H. H. Cheng
We report a strain analysis on a wrinkled semiconductor pattern formed by a p-doped bilayer thin film that is compressively strained. The strain distribution is studied with a theoretical analysis using a non-linear plate theory in conjunction with a detailed morphology measurement. The results show ... [J. Appl. Phys. 111, 034314 (2012)] published Fri Feb 10, 2012.
Investigation of easy axis orientation of NdFeB melt-spun ribbons produced by hot rolling and influence of TiC addition
M. Takezawa, Y. Nakanishi, Y. Morimoto, J. Yamasaki, and M. Yagi
The c-axis orientation of NdFeB melt-spun ribbons caused by hot rolling and the influence of TiC addition were investigated. A small roll was placed on a steel wheel near a quartz tube in such a manner that the melt-spun ribbons were hot rolled immediately after quenching. X-ray diffraction patterns ... [J. Appl. Phys. 111, 07A703 (2012)] published Fri Feb 10, 2012.
Formation of an extended CoSi thin nanohexagons array coherently buried in silicon single crystal
Guinther Kellermann, Luciano A. Montoro, Lisandro J. Giovanetti, Paula C. dos Santos Claro, Liang Zhang et al.
A Co-doped silica film was deposited on the surface of a Si(100) wafer and isothermally annealed at 750 degrees C to form spherical Co nanoparticles embedded in the silica film and a few atomic layer thick CoSi nanoplatelets within the wafer. The structure, morphology, and spatial orientation of th ... [Appl. Phys. Lett. 100, 063116 (2012)] published Fri Feb 10, 2012.
Fabrication of disconnected three-dimensional silver nanostructures in a polymer matrix
Kevin Vora, SeungYeon Kang, Shobha Shukla, and Eric Mazur
We present a simple, one-step technique for direct-writing of a structured nanocomposite material with disconnected silver nanostructures in a polymer matrix. A nonlinear optical interaction between femtosecond laser pulses and a composite material creates silver structures that are embedded inside ... [Appl. Phys. Lett. 100, 063120 (2012)] published Fri Feb 10, 2012.
Local structural models of complex oxygen- and hydroxyl-rich GaP/InP(001) surfaces
Brandon C. Wood, Tadashi Ogitsu, and Eric Schwegler
We perform density-functional theory calculations on model surfaces to investigate the interplay between the morphology, electronic structure, and chemistry of oxygen- and hydroxyl-rich surfaces of InP(001) and GaP(001). Four dominant local oxygen topologies are identified based on the coordination ... [J. Chem. Phys. 136, 064705 (2012)] published Fri Feb 10, 2012.
Grown-in precipitates in heavily phosphorus-doped Czochralski silicon
Yuheng Zeng, Xiangyang Ma, Jiahe Chen, Weijie Song, Weiyan Wang et al.
Through comparing the oxygen precipitation in the heavily and lightly phosphorus (P)-doped Czochralski silicon (CZ Si) specimens subjected to the simulated cooling processes of silicon ingot, we researched the influences of heavily P doping on grown-in precipitates by preferential etching and transm ... [J. Appl. Phys. 111, 033520 (2012)] published Thu Feb 9, 2012.
Diffusion of Nd-rich phase in the spark plasma sintered and hot deformed nanocrystalline NdFeB magnets
Y. L. Huang, Z. W. Liu, X. C. Zhong, H. Y. Yu, X. X. Gao et al.
The role of the Nd-rich phase in developing microstructure and properties of isotropic and anisotropic NdFeB magnets has been investigated. Melt spun Nd-rich NdFeCoGaB and Fe-rich NdPrFeB alloy powders were mechanically mixed with different ratios. The mixed powders were consolidated into isotropic ... [J. Appl. Phys. 111, 033913 (2012)] published Thu Feb 9, 2012.
Well-arranged novel InGaN hexagonal nanoplates at the tops of nitrogen-polarity GaN nanocolumn arrays
Tetsuya Kouno (光野徹也) and Katsumi Kishino (岸野克巳)
Periodically arranged novel InGaN hexagonal nanoplates were fabricated at the tops of square-lattice N-polarity GaN nanocolumn arrays. The key finding in this work is that the growth of InGaN on N-polarity GaN nanocolumns led to a peculiar nanoplate structure. The InGaN nanoplates with thicknesses o ... [AIP Advances 2, 012140 (2012)] published Thu Feb 9, 2012.
Magnetic behaviour of NiZnCoFeO spinel nano-ferrite
Atul Thakur, Preeti Thakur, and Jen-Hwa Hsu
Nanoparticles of the spinel ferrite NiZnCoFeO, have been synthesized by a co-precipitation method. The x-ray diffraction patterns of the particles confirmed the formation of single-phase cubic spinel structure. The Langevin function fitting on M-H data at 300 K gives a log-normal particle size distr ... [J. Appl. Phys. 111, 07A305 (2012)] published Thu Feb 9, 2012.
Understanding on the current-induced crystallization process and faster set write operation thereof in non-volatile phase change memory
Dae-Hwan Kang, Nan Young Kim, Hongsik Jeong, and Byung-ki Cheong
We experimentally demonstrate that the crystallization process of Ge-Sb-Te crystallites during the set operation in non-volatile phase change memory commences after threshold switching event. It is also shown that the nucleation and growth rates have opposite behaviors with the increase of set opera ... [Appl. Phys. Lett. 100, 063508 (2012)] published Thu Feb 9, 2012.
Epitaxial growth and demonstration of hexagonal BN/AlGaN p-n junctions for deep ultraviolet photonics
S. Majety, J. Li, X. K. Cao, R. Dahal, B. N. Pantha et al.
Recent advances in epitaxial growth and demonstration of p-type conductivity in hexagonal boron nitride (hBN) epilayers represent an exceptional opportunity to revolutionize p-layer approach and overcome the intrinsic problem of low p-type conductivity in Al-rich AlGaN for deep ultraviolet (DUV) dev ... [Appl. Phys. Lett. 100, 061121 (2012)] published Thu Feb 9, 2012.
Room temperature single photon emission from an epitaxially grown quantum dot
O. Fedorych, C. Kruse, A. Ruban, D. Hommel, G. Bacher et al.
Single photon emission from an epitaxially grown quantum dot at room temperature is presented. CdSe/ZnSSe quantum dots are embedded into MgS barriers, providing dominant radiative recombination up to 300 K. Under continuous wave optical excitation, the autocorrelation function g(t) exhibits a sharp ... [Appl. Phys. Lett. 100, 061114 (2012)] published Thu Feb 9, 2012.
Resonant magnetic response of TiO microspheres at terahertz frequencies
H. Nemec, C. Kadlec, F. Kadlec, P. Kuzel, R. Yahiaoui et al.
Spray-drying technique is used to fabricate spherical microparticles out of dissolved TiO nanoparticles. We show both experimentally and through numerical calculations that the microspheres support a Mie resonance, leading to an effective magnetic response. For this purpose, nearly single layers of ... [Appl. Phys. Lett. 100, 061117 (2012)] published Thu Feb 9, 2012.
Morphology of Lamellae-Forming Block Copolymer Films between Two Orthogonal Chemically Nanopatterned Striped Surfaces
Guoliang Liu, Abelardo Ramirez-Hernandez, Hiroshi Yoshida, Kim Nygard, Dillip K. Satapathy et al.
The structure of block copolymers results from the interplay between weak intermolecular forces, typically in the order of kT per molecule. This is particularly true for block copolymer thin films in the presence of chemically patterned surfaces, where the different contributions to the total free e ... [Phys. Rev. Lett. 108, 065502 ] published .
Thermodynamic, Raman and electrical switching studies on SiTeAg (4 <= x <= 20) glasses
Srinivasa Rao Gunti and Sundarrajan Asokan
We have investigated thermal properties of bulk SiTeAg (4 <= x <= 20) glasses in detail, through alternating differential scanning calorimetry experiments. The composition dependence of thermal parameters reveal the signatures of rigidity percolation and chemical threshold at compositions x = 12 and ... [J. Appl. Phys. 111, 033518 (2012)] published Wed Feb 8, 2012.
First principles analysis of the initial oxidation of Si(001) and Si(111) surfaces terminated with H and CH
Huashan Li, Zhibin Lin, Zhigang Wu, and Mark T. Lusk
Transition state analyses have been carried out within a density functional theory setting to explain and quantify the distinctly different ways in which hydrogen and methyl terminations serve to protect silicon surfaces from the earliest onset of oxidation. We find that oxidation occurs via direct ... [J. Chem. Phys. 136, 064507 (2012)] published Wed Feb 8, 2012.
Effect of indium doping on physical properties of nanocrystallized SnS zinc blend thin films grown by chemical bath deposition
Meriem Reghima, Anis Akkari, Cathy Guasch, and Najoua Kamoun-Turki
SnS:In thin films have been successfully prepared on Pyrex substrates using low cost chemical bath deposition technique with different indium concentrations (y=(([In])/([Sn]))=4%,6%,8%,and10%). The structure, the surface morphology, and the optical properties of the SnS:In films were studied by x-ra ... [J. Renewable Sustainable Energy 4, 011602 (2012)] published Wed Feb 8, 2012.
Development of tilted hexagonal platelet ZnO using atmospheric pressure chemical vapor deposition and investigation of its growth mechanism
Y. Z. Yoo, S. H. Kim, G. S. Yoon, E. H. Choi, J.-W. Park et al.
Large area ZnO films (25 x 25 cm) grown via atmospheric pressure chemical vapor deposition (APCVD) showed unique surface morphologies of tilted hexagonal platelets. In response to the tilt angle change from 50 degrees to 75 degrees , haze values increased from 7% to 25%, indicating that tilt angl ... [Appl. Phys. Lett. 100, 061909 (2012)] published Wed Feb 8, 2012.
Enhancement of photoluminescence signal from ultrathin layers with silicon nanocrystals
S. A. Dyakov, D. M. Zhigunov, A. Hartel, M. Zacharias, T. S. Perova et al.
Using the model of oscillating dipoles, we simulated the photoluminescence intensity of a triple-layered structure where the silicon nanocrystals layer was enclosed by buffer and capping silicon dioxide layers. It was found that a structure with an optimized buffer layer thickness exhibited photolum ... [Appl. Phys. Lett. 100, 061908 (2012)] published Wed Feb 8, 2012.
Fabrication of nanoscale glass fibers by electrospinning
M. Praeger, E. Saleh, A. Vaughan, W. J. Stewart, and W. H. Loh
We report the experimental realization of glass nanofibers by electrospinning directly from a melt, demonstrating the viability of electrospinning fibers from non-polymer materials with high melting temperatures and higher surface tensions. The nanofiber material (BO) is molten on the tip of a gold ... [Appl. Phys. Lett. 100, 063114 (2012)] published Wed Feb 8, 2012.
High-strength titanium alloy nanopillars with stacking faults and enhanced plastic flow
Qian Yu, Suzhi Li, Andrew M. Minor, Jun Sun, and Evan Ma
Through ex situ and in situ compression and tension tests of micrometer- and submicrometer-sized single crystal hexagonal close packed (HCP) Ti alloy pillars oriented for prismatic slip, we have observed that smaller is stronger and the larger samples exhibit obvious strain bursts. However, for extr ... [Appl. Phys. Lett. 100, 063109 (2012)] published Wed Feb 8, 2012.
Near-infrared nano-spectroscopy of semiconductor quantum dots using a phase-change mask layer
N. Tsumori, M. Takahashi, R. Kubota, P. Regreny, M. Gendry et al.
We propose a technique that uses an optical mask layer of a phase-change material (PCM), which is used for rewritable optical recording media, to achieve highly sensitive near-field imaging spectroscopy of single semiconductor quantum constituents at optical telecommunication wavelengths. An amorpho ... [Appl. Phys. Lett. 100, 063111 (2012)] published Wed Feb 8, 2012.
Planar-localized surface plasmon resonance device by block-copolymer and nanoimprint lithography fabrication methods
C. Y. Peter Yang, Elaine L. Yang, Chip A. Steinhaus, Chi-Chun Liu, Paul F. Nealey et al.
The authors report on the integration of delocalized surface plasmon resonances (SPRs) and localized surface plasmon resonances (LSPRs) on a single device. The submicron SPR device was fabricated with nanoimprint lithography (NIL). Gold nanoparticles for LSPR generation were created and deposited vi ... [J. Vac. Sci. Technol. B 30, 026801 (2012)] published Wed Feb 8, 2012.
Growth of GaNAsP alloys on GaP(100) by gas-source molecular beam epitaxy
Yan-Jin Kuang (邝彦瑾), San-Wen Chen (陳尚文), Hua Li (李华), Sunil K. Sinha, and Charles Wuching Tu
The authors report epitaxial growth of dilute nitride GaNAsP on GaP(100) via a linearly graded GaAsP metamorphic buffer. The As content is in situ determined by group-V-induced reflection high energy electron diffraction intensity oscillation, while the N content is determined by x-ray diffraction. ... [J. Vac. Sci. Technol. B 30, 02B121 (2012)] published Wed Feb 8, 2012.
Work function extraction of metal gates with alternate channel materials
Mary Coan, Derek Johnson, Jung Hwan Woo, Nivedita Biswas, Veena Misra et al.
The effects of a heterojunction on the effective work function in a metal/high kappa gate stack are studied and a new structure developed for the extraction of the work function. It is found that when a Ge/Si heterostructure on silicon is low doped and sufficiently thin, then the work function can b ... [J. Vac. Sci. Technol. B 30, 022202 (2012)] published Wed Feb 8, 2012.
Porous antimony-doped tin oxide cathodes formed by supercritical CO treatment at low temperature for silver electro-deposition
W. C. Tien, A. K. Chu, H. Y. Wen, M. Y. Chang, and W. Y. Huang
Porous antimony-doped tin oxide (ATO) cathodes for silver electrodeposition devices are proposed. The porous structure of the cathodes is obtained by applying supercritical CO (SCCO) treatment at 60 degrees C on spin-coated ATO nanoparticles. The morphological, structural, and electrical properties ... [J. Vac. Sci. Technol. A 30, 020603 (2012)] published Wed Feb 8, 2012.
Self-organized ZnO nanodot arrays: Effective control using SiN interlayers and low-temperature plasmas
S. Y. Huang, Q. J. Cheng, S. Xu, D. Y. Wei, H. P. Zhou et al.
An advanced inductively coupled plasma (ICP)-assisted rf magnetron sputtering deposition method is developed to synthesize regular arrays of pear-shaped ZnO nanodots on a thin SiN buffer layer pre-deposited onto a silicon substrate. It is shown that the growth of ZnO nanodots obey the cubic root-law ... [J. Appl. Phys. 111, 036101 (2012)] published Tue Feb 7, 2012.
Gas Phase Deposition of Trichloro(1H,1H,2H,2H-perfluorooctyl)silane on Silicon Dioxide, by XPS
Michael V. Lee, Ghaleb Husseini, Ken Sautter, and Matthew R. Linford
Monolayers of trichloro(lH,1H,2H,2H-perfluorooctyl)silane, ClSiCHCH(CF)CF, were deposited via chemical vapor deposition onto the native oxide layer on silicon after plasma-cleaning. The samples have high hydrophobicity, and provide a valuable comparison to perfluorinated alkyl silane layers obtained ... [Surf. Sci. Spectra 17, 87 (2012)] published Tue Feb 7, 2012.
Grand-potential formulation for multicomponent phase transformations combined with thin-interface asymptotics of the double-obstacle potential
Abhik Choudhury and Britta Nestler
In this paper, we describe the derivation of a model for the simulation of phase transformations in multicomponent real alloys starting from a grand-potential functional. We first point out the limitations of a phase-field model when evolution equations for the concentration and the phase-field vari ... [Phys. Rev. E 85, 021602 ] published .
van der Waals density functional study of CO binding in zeolitic imidazolate frameworks
Keith G. Ray, David Olmsted, Ning He, Yao Houndonougbo, Brian B. Laird et al.
The van der Waals density functional (vdW-DF) formalism is employed in a study of the binding energetics for CO in a set of five zeolitic imidazolate framework (ZIF) compounds. The ZIF structures investigated share the same RHO-type zeolite topology and metal atoms, but feature imidazolate linkers w ... [Phys. Rev. B 85, 085410 ] published .
Structural origins of intrinsic stress in amorphous silicon thin films
Eric Johlin, Nouar Tabet, Sebastian Castro-Galnares, Amir Abdallah, Mariana I. Bertoni et al.
Hydrogenated amorphous silicon (a-Si:H) refers to a broad class of atomic configurations, sharing a lack of long-range order, but varying significantly in material properties, including optical constants, porosity, hydrogen content, and intrinsic stress. It has long been known that deposition condit ... [Phys. Rev. B 85, 075202 ] published .