Nanoscale Science And Design

Key role of the wetting layer in revealing the hidden path of Ge/Si(001) Stranski-Krastanow growth onset

Moritz Brehm, Francesco Montalenti, Martyna Grydlik, Guglielmo Vastola, Herbert Lichtenberger et al.
The commonly accepted Stranski-Krastanow model, according to which island formation occurs on top of a wetting layer (WL) of a certain thickness, predicts for the morphological evolution an increasing island aspect ratio with volume. We report on an apparent violation of this thermodynamic understan ... [Phys. Rev. B 80, 205321 (2009)] published Thu Nov 19, 2009.

Band-gap tunability of a (6,0) BN nanotube bundle under pressure: Ab initio calculations

S. S. Coutinho, V. Lemos, and S. Guerini
Ab initio calculations were performed to study the structural transformation on a boron nitride nanotubes bundle under pressure. Several bundles of boron nitride nanotubes, disposed into a hexagonal arrangement, were studied between which the (6,0) zigzag configuration was chosen to be detailed here ... [Phys. Rev. B 80, 193408 (2009)] published Thu Nov 19, 2009.

Expansion-limited aggregation of nanoclusters in a single-pulse laser-produced plume

E. G. Gamaly, N. R. Madsen, D. Golberg, and A. V. Rode
Formation of carbon nanoclusters in a single-laser-pulse created ablation plume was studied both in vacuum and in a noble gas environment at various pressures. The developed theory provides cluster radius dependence on combination of laser parameters, properties of ablated material, and type and pre ... [Phys. Rev. B 80, 184113 (2009)] published Thu Nov 19, 2009.

Excitation dynamics in polymer-coated semiconductor quantum dots with integrated dye molecules: The role of reabsorption

Tobias Niebling, Feng Zhang, Zulqurnain Ali, Wolfgang J. Parak, and Wolfram Heimbrodt
Inorganic CdSe/ZnS core-shell quantum dots have been coated with amphiphilic polymers in order to enable their transfer to aqueous solutions. Additionally, ATTO-dye molecules have been embedded in the polymer shell. In this geometry ATTO dye acts as acceptor of the quantum dot donors' excitation. Th ... [J. Appl. Phys. 106, 104701 (2009)] published Thu Nov 19, 2009.

Conformal Sn Coated TiO Nanotube Arrays and Its Electrochemical Performance for High Rate Lithium-Ion Batteries

Hyun Sik Kim, Soon Hyung Kang, Young Hoon Chung, and Yung-Eun Sung
A nanophase tin (Sn) layer was coated on self-ordered TiO nanotube (TONT) arrays of 400 nm length and 120 nm diameter by using a radio-frequency magnetron sputtering method followed by heat-treatment at low temperature. The morphological and structural characterization of the Sn-coated TONT (Sn/TONT ... [Electrochem. Solid-State Lett. 13, A15 (2009)] published Thu Nov 19, 2009.

Telescopic hot double wall carbon nanotube for nanolithography

A. Popescu and L. M. Woods
A custom double wall carbon nanotube for thermal surface modification is proposed. By studying the heat transfer characteristics in the system, it is demonstrated that such a device is capable of producing high resolution patterns on a sample surface. A constant distance between the double wall carb ... [Appl. Phys. Lett. 95, 203507 (2009)] published Thu Nov 19, 2009.

Fabrication of large-area gallium arsenide nanowires using silicon dioxide nanoparticle mask

Ding-Shin Wang, Jiun-Jie Chao, Shih-Che Hung, and Ching-Fuh Lin
Large-area GaAs nanowires are fabricated using SiO nanoparticles as the etching mask. SiO nanoparticle monolayer is spin coated on the GaAs substrate. To obtain a uniform monolayer of SiO nanoparticles across the substrate, raised temperature, adequate solution concentration, and the substrate treat ... [J. Vac. Sci. Technol. B 27, 2449 (2009)] published Thu Nov 19, 2009.

Preparation and Electrochemical Performance of Externally Doped Sulfonated Polyaniline/Multiwalled Carbon Nanotube Composites

Yen-Wen Lin, Hao-Hsiang Chang, Yu-Shan Liu, Ming-Chien Tsai, Yu-Chen Tsai et al.
The externally doped sulfonated polyaniline (ED-SPANI) has emerged as a potential candidate for electrochemical sensors because of its unique electroactive property and water solubility. However, the lower conductivity is the major drawback for the application of ED-SPANI. Thus, this study describes ... [J. Electrochem. Soc. 157, K15 (2009)] published Wed Nov 18, 2009.

Interfering pathways in benzene: An analytical treatment

Thorsten Hansen, Gemma C. Solomon, David Q. Andrews, and Mark A. Ratner
The mechanism for off-resonant electron transport through small organic molecules in metallic junctions is predominantly coherent tunneling. Thus, new device functionalities based on quantum interference could be developed in the field of molecular electronics. We invoke a partitioning technique to ... [J. Chem. Phys. 131, 194704 (2009)] published Wed Nov 18, 2009.

Nonvolatile memory with CoSiO core-shell nanocrystals as charge storage nodes in floating gate

Hai Liu, Domingo A. Ferrer, Fahmida Ferdousi, and Sanjay K. Banerjee
In this letter, we reported nanocrystal floating gate memory with CoSiO core-shell nanocrystal charge storage nodes. By using a water-in-oil microemulsion scheme, CoSiO core-shell nanocrystals were synthesized and closely packed to achieve high density matrix in the floating gate without aggregation ... [Appl. Phys. Lett. 95, 203112 (2009)] published Wed Nov 18, 2009.

Room-Temperature Synthesis of Cobalt Nanoparticles by Electroless Deposition in Aqueous Solution

Mary Donnabelle L. Balela, Shunsuke Yagi, and Eiichiro Matsubara
Metallic Co nanoparticles of 24110 nm diameters are prepared by electroless deposition (chemical reduction) in an aqueous solution at room temperature. The reduction process is monitored by an in situ measurement of a mixed potential. The mixed potential, which is above the redox potential of a Co(I ... [Electrochem. Solid-State Lett. 13, D4 (2009)] published Wed Nov 18, 2009.

Thermodynamically stable nanotips of AuMo alloy

K. Nomura, T. Nagao, B. L. Cho, H. Katsuda, T. Matsumura et al.
The authors propose a simple new method for fabricating stable nanotips using sharpened AuMo alloy tips. By annealing at 10001200 K in UHV, Au atoms segregate to the alloy surface to form a Au film of one physical monolayer thickness, resulting in formation of nanopyramids on the (111) surface. Alt ... [J. Vac. Sci. Technol. B 27, 2432 (2009)] published Wed Nov 18, 2009.

A quality map of transfer printing

Matthew B. Tucker, D. R. Hines, and Teng Li
Transfer printing is a nanofabrication technique that involves an assembly process by which a printable layer can be transferred from a transfer substrate to a device substrate. Future application of transfer printing toward a roll-to-roll printing process of flexible devices hinges upon the underst ... [J. Appl. Phys. 106, 103504 (2009)] published Tue Nov 17, 2009.

Synthesis and characterization of nanoporous PtNi alloys

Hongqi Li, Amit Misra, Jon K. Baldwin, and S. T. Picraux
Two nanoporous PtNi alloys were synthesized by dealloying ternary amorphous SiPtNi precursors. Both foams have nearly the same composition, ligament diameter size, and density. However, their ligament patterns are different, depending on the microstructure of precursors. The difference in morphology ... [Appl. Phys. Lett. 95, 201902 (2009)] published Mon Nov 16, 2009.

Formation of InAs/InGaAsP quantum-dashes on InP(001)

A. Lenz, F. Genz, H. Eisele, L. Ivanova, R. Timm et al.
Self-assembled InAs/InGaAsP/InP(001) nanostructures are investigated using cross-sectional scanning tunneling microscopy. Atomically resolved images at both the (110) and the ([overline 1]10) cleavage surface show InAs quantum dashes with almost binary composition and a truncated pyramidal shape. Th ... [Appl. Phys. Lett. 95, 203105 (2009)] published Mon Nov 16, 2009.

Sol-gel derived ferroelectric nanoparticles investigated by piezoresponse force microscopy

F. Johann, T. Jungk, S. Lisinski, A. Hoffmann, L. Ratke et al.
Piezoresponse force microscopy (PFM) was used to investigate the ferroelectric properties of sol-gel derived LiNbO nanoparticles. To determine the degree of ferroelectricity we took large-area images and performed statistical image-analysis. The ferroelectric behavior of single nanoparticles was ver ... [Appl. Phys. Lett. 95, 202901 (2009)] published Mon Nov 16, 2009.

X-ray absorption spectroscopy of biomimetic dye molecules for solar cells

Peter L. Cook, Xiaosong Liu, Wanli Yang, and F. J. Himpsel
Dye-sensitized solar cells are potentially inexpensive alternatives to traditional semiconductor solar cells. In order to optimize dyes for solar cells we systematically investigate the electronic structure of a variety of porphyrins and phthalocyanines. As a biological model system we use the heme ... [J. Chem. Phys. 131, 194701 (2009)] published Mon Nov 16, 2009.

Analytical model of the quasistatic mechanical behavior of galvanic piezoelectric microelectromechanical system switches

Olaf Wunnicke
An analytical model of the quasistatic behavior of galvanic piezoelectric microelectromechanical system (MEMS) switches is described. The model is based on the EulerBernoulli beam equation. Two geometries often used in galvanic switches are investigated: the single clamped cantilever (SCC) and the d ... [J. Appl. Phys. 106, 104502 (2009)] published Mon Nov 16, 2009.

Publisher's Note: Damping and decoherence of a nanomechanical resonator due to a few two-level systems [Phys. Rev. B 80, 174103 (2009)]

Laura G. Remus, Miles P. Blencowe, and Yukihiro Tanaka
Abstract not available. [Phys. Rev. B 80, 179901 (2009)] published Fri Nov 13, 2009.

Multichannel carbon nanotube field-effect transistors with compound channel layer

Changxin Chen, Wei Zhang, and Yafei Zhang
A multichannel carbon nanotube field-effect transistor (MC-CNTFET) with compound channel layer has been built. In this MC-CNTFET, a dispersedly directed array of long single-walled carbon nanotubes (SWCNTs) is used as primary channel layer and a randomly aligned monolayer network of short SWCNTs act ... [Appl. Phys. Lett. 95, 192110 (2009)] published Fri Nov 13, 2009.

Electrodeposition of NiP AlloyMultiwalled Carbon Nanotube Composite Films

Yosuke Suzuki, Susumu Arai, and Morinobu Endo
NiP alloymultiwalled carbon nanotube (MWCNT) composite films were fabricated by an electrodeposition technique, and their microstructure, hardness, and frictional properties were analyzed. NiP alloyMWCNT composite films containing 2022 atom % P and 0.71.2 mass % MWCNTs were electrodeposited from a c ... [J. Electrochem. Soc. 157, D50 (2009)] published Fri Nov 13, 2009.

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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