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Beilstein Journal of Nanotechnology

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https://www.readbyqxmd.com/read/28326241/modeling-of-the-growth-of-gaas-algaas-core-shell-nanowires
#1
Qian Zhang, Peter W Voorhees, Stephen H Davis
Heterostructured GaAs-AlGaAs core-shell nanowires with have attracted much attention because of their significant advantages and great potential for creating high performance nanophotonics and nanoelectronics. The spontaneous formation of Al-rich stripes along certain crystallographic directions and quantum dots near the apexes of the shell are observed in AlGaAs shells. Controlling the formation of these core-shell heterostructures remains challenging. A two-dimensional model valid on the wire cross section, that accounts for capillarity in the faceted surface limit and deposition has been developed for the evolution of the shell morphology and concentration in Al x Ga1-x As alloys...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326240/formation-and-shape-control-of-hierarchical-cobalt-nanostructures-using-quaternary-ammonium-salts-in-aqueous-media
#2
Ruchi Deshmukh, Anurag Mehra, Rochish Thaokar
Aggregation and self-assembly are influenced by molecular interactions. With precise control of molecular interactions, in this study, a wide range of nanostructures ranging from zero-dimensional nanospheres to hierarchical nanoplates and spindles have been successfully synthesized at ambient temperature in aqueous solution. The nanostructures reported here are formed by aggregation of spherical seed particles (monomers) in presence of quaternary ammonium salts. Hydroxide ions and a magnetic moment of the monomers are essential to induce shape anisotropy in the nanostructures...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326239/nanostructured-carbon-materials-decorated-with-organophosphorus-moieties-synthesis-and-application
#3
Giacomo Biagiotti, Vittoria Langè, Cristina Ligi, Stefano Caporali, Maurizio Muniz-Miranda, Anna Flis, K Michał Pietrusiewicz, Giacomo Ghini, Alberto Brandi, Stefano Cicchi
A new synthetic approach for the production of carbon nanomaterials (CNM) decorated with organophosphorus moieties is presented. Three different triphenylphosphine oxide (TPPO) derivatives were used to decorate oxidized multiwalled carbon nanotubes (ox-MWCNTs) and graphene platelets (GPs). The TPPOs chosen bear functional groups able to react with the CNMs by Tour reaction (an amino group), nitrene cycloaddition (an azido group) or CuAAC reaction (one terminal C-C triple bond). All the adducts were characterized by FTIR, Raman spectroscopy, TEM, XPS, elemental analysis and ICP-AES...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326238/fiber-optic-sensors-based-on-hybrid-phenyl-silica-xerogel-films-to-detect-n-hexane-determination-of-the-isosteric-enthalpy-of-adsorption
#4
Jesús C Echeverría, Ignacio Calleja, Paula Moriones, Julián J Garrido
We investigated the response of three fiber optic sensing elements prepared at pH 10 from phenyltriethoxysilane (PhTEOS) and tetraethylsilane (TEOS) mixtures with 30, 40, and 50% PhTEOS in the silicon precursor mixture. The sensing elements are referred to as Ph30, Ph40 and Ph50, respectively. The films were synthesized by the sol-gel method and affixed to the end of optical fibers by the dip-coating technique. Fourier transform infrared spectroscopy, N2 adsorption-desorption at 77 K and X-ray diffraction analysis were used to characterize the xerogels...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326237/advances-in-the-fabrication-of-graphene-transistors-on-flexible-substrates
#5
Gabriele Fisichella, Stella Lo Verso, Silvestra Di Marco, Vincenzo Vinciguerra, Emanuela Schilirò, Salvatore Di Franco, Raffaella Lo Nigro, Fabrizio Roccaforte, Amaia Zurutuza, Alba Centeno, Sebastiano Ravesi, Filippo Giannazzo
Graphene is an ideal candidate for next generation applications as a transparent electrode for electronics on plastic due to its flexibility and the conservation of electrical properties upon deformation. More importantly, its field-effect tunable carrier density, high mobility and saturation velocity make it an appealing choice as a channel material for field-effect transistors (FETs) for several potential applications. As an example, properly designed and scaled graphene FETs (Gr-FETs) can be used for flexible high frequency (RF) electronics or for high sensitivity chemical sensors...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326236/the-longstanding-challenge-of-the-nanocrystallization-of-1-3-5-trinitroperhydro-1-3-5-triazine-rdx
#6
REVIEW
Florent Pessina, Denis Spitzer
Research efforts for realizing safer and higher performance energetic materials are continuing unabated all over the globe. While the thermites - pyrotechnic compositions of an oxide and a metal - have been finely tailored thanks to progress in other sectors, organic high explosives are still stagnating. The most symptomatic example is the longstanding challenge of the nanocrystallization of 1,3,5-trinitroperhydro-1,3,5-triazine (RDX). Recent advances in crystallization processes and milling technology mark the beginning of a new area which will hopefully lead the pyroelectric industry to finally embrace nanotechnology...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326235/study-of-the-surface-properties-of-zno-nanocolumns-used-for-thin-film-solar-cells
#7
Neda Neykova, Jiri Stuchlik, Karel Hruska, Ales Poruba, Zdenek Remes, Ognen Pop-Georgievski
Densely packed ZnO nanocolumns (NCs), perpendicularly oriented to the fused-silica substrates were directly grown under hydrothermal conditions at 90 °C, with a growth rate of around 0.2 μm/h. The morphology of the nanostructures was visualized and analyzed by scanning electron microscopy (SEM). The surface properties of ZnO NCs and the binding state of present elements were investigated before and after different plasma treatments, typically used in plasma-enhanced CVD solar cell deposition processes, by X-ray photoelectron spectroscopy (XPS)...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326234/self-assembly-of-silicon-nanowires-studied-by-advanced-transmission-electron-microscopy
#8
Marta Agati, Guillaume Amiard, Vincent Le Borgne, Paola Castrucci, Richard Dolbec, Maurizio De Crescenzi, My Alì El Khakani, Simona Boninelli
Scanning transmission electron microscopy (STEM) was successfully applied to the analysis of silicon nanowires (SiNWs) that were self-assembled during an inductively coupled plasma (ICP) process. The ICP-synthesized SiNWs were found to present a Si-SiO2 core-shell structure and length varying from ≈100 nm to 2-3 μm. The shorter SiNWs (maximum length ≈300 nm) were generally found to possess a nanoparticle at their tip. STEM energy dispersive X-ray (EDX) spectroscopy combined with electron tomography performed on these nanostructures revealed that they contain iron, clearly demonstrating that the short ICP-synthesized SiNWs grew via an iron-catalyzed vapor-liquid-solid (VLS) mechanism within the plasma reactor...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326233/fabrication-of-black-gold-coatings-by-glancing-angle-deposition-with-sputtering
#9
Alan Vitrey, Rafael Alvarez, Alberto Palmero, María Ujué González, José Miguel García-Martín
The fabrication of black-gold coatings using sputtering is reported here. Glancing angle deposition with a rotating substrate is needed to obtain vertical nanostructures. Enhanced light absorption is obtained in the samples prepared in the ballistic regime with high tilt angles. Under these conditions the diameter distribution of the nanostructures is centered at about 60 nm and the standard deviation is large enough to obtain black-metal behavior in the visible range.
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326232/role-of-oxygen-in-wetting-of-copper-nanoparticles-on-silicon-surfaces-at-elevated-temperature
#10
Tapas Ghosh, Biswarup Satpati
Copper nanoparticles have been deposited on silicon surfaces by a simple galvanic displacement reaction, and rapid thermal annealing has been performed under various atmospheric conditions. In spite of the general tendency of the agglomeration of nanoparticles to lower the surface energy at elevated temperatures, our plan-view and cross-sectional transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis shows that the thermal oxidation of the copper nanoparticles and formation of cupric oxide (CuO) on silicon surfaces leads to wetting rather than agglomeration...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326231/in-situ-monitoring-by-raman-spectroscopy-of-the-thermal-doping-of-graphene-and-mos2-in-o2-controlled-atmosphere
#11
Aurora Piazza, Filippo Giannazzo, Gianpiero Buscarino, Gabriele Fisichella, Antonino La Magna, Fabrizio Roccaforte, Marco Cannas, Franco Mario Gelardi, Simonpietro Agnello
The effects of temperature and atmosphere (air and O2) on the doping of monolayers of graphene (Gr) on SiO2 and Si substrates, and on the doping of MoS2 multilayer flakes transferred on the same substrates have been investigated. The investigations were carried out by in situ micro-Raman spectroscopy during thermal treatments up to 430 °C, and by atomic force microscopy (AFM). The spectral positions of the G and 2D Raman bands of Gr undergo only minor changes during treatment, while their amplitude and full width at half maximum (FWHM) vary as a function of the temperature and the used atmosphere...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326230/methods-for-preparing-polymer-decorated-single-exchange-biased-magnetic-nanoparticles-for-application-in-flexible-polymer-based-films
#12
Laurence Ourry, Delphine Toulemon, Souad Ammar, Fayna Mammeri
Background: Magnetic nanoparticles (NPs) must not only be well-defined in composition, shape and size to exhibit the desired properties (e.g., exchange-bias for thermal stability of the magnetization) but also judiciously functionalized to ensure their stability in air and their compatibility with a polymer matrix, in order to avoid aggregation which may seriously affect their physical properties. Dipolar interactions between NPs too close to each other favour a collective magnetic glass state with lower magnetization and coercivity because of inhomogeneous and frustrated macrospin cluster freezing...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326229/biological-and-biomimetic-materials-and-surfaces
#13
EDITORIAL
Stanislav Gorb, Thomas Speck
No abstract text is available yet for this article.
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326228/innovations-from-the-ivory-tower-wilhelm-barthlott-and-the-paradigm-shift-in-surface-science
#14
Christoph Neinhuis
This article is mainly about borders that have tremendous influence on our daily life, although many of them exist and act mostly unrecognized. In this article the first objective will be to address more generally the relation between university and society or industry, borders within universities, borders in thinking and the huge amount of misunderstandings and losses resulting from these obvious or hidden borders. In the second part and in more detail, the article will highlight the impact of the research conducted by Wilhelm Barthlott throughout his scientific career during which not only one border was removed, shifted or became more penetrable...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326227/uptake-of-the-proteins-htra1-and-htra2-by-cells-mediated-by-calcium-phosphate-nanoparticles
#15
Olga Rotan, Katharina N Severin, Simon Pöpsel, Alexander Peetsch, Melisa Merdanovic, Michael Ehrmann, Matthias Epple
The efficient intracellular delivery of (bio)molecules into living cells remains a challenge in biomedicine. Many biomolecules and synthetic drugs are not able to cross the cell membrane, which is a problem if an intracellular mode of action is desired, for example, with a nuclear receptor. Calcium phosphate nanoparticles can serve as carriers for small and large biomolecules as well as for synthetic compounds. The nanoparticles were prepared and colloidally stabilized with either polyethyleneimine (PEI; cationic nanoparticles) or carboxymethyl cellulose (CMC; anionic nanoparticles) and loaded with defined amounts of the fluorescently labelled proteins HTRA1, HTRA2, and BSA...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326226/comparison-of-four-methods-for-the-biofunctionalization-of-gold-nanorods-by-the-introduction-of-sulfhydryl-groups-to-antibodies
#16
Xuefeng Wang, Zhong Mei, Yanyan Wang, Liang Tang
Introducing sulfhydryl groups to biomolecules to functionalize gold nanorods (GNRs) is an attractive method that involves the creation of a strong Au-S bond. Previously, we developed a facile method to functionalize GNR surfaces by thiolating antibodies using Traut's reagent. In the current study, we evaluated several methods for the introduction of thiol groups onto the surface of GNRs by using Traut's reagent, dithiotreitol (DTT), dithiolaromatic PEG6-CONHNH2, and thiol-polyethylene glycolamine (SH-PEG-NH2) combined with EDC reaction...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28326225/multimodal-cantilevers-with-novel-piezoelectric-layer-topology-for-sensitivity-enhancement
#17
Steven Ian Moore, Michael G Ruppert, Yuen Kuan Yong
Self-sensing techniques for atomic force microscope (AFM) cantilevers have several advantageous characteristics compared to the optical beam deflection method. The possibility of down scaling, parallelization of cantilever arrays and the absence of optical interference associated imaging artifacts have led to an increased research interest in these methods. However, for multifrequency AFM, the optimization of the transducer layout on the cantilever for higher order modes has not been addressed. To fully utilize an integrated piezoelectric transducer, this work alters the layout of the piezoelectric layer to maximize both the deflection of the cantilever and measured piezoelectric charge response for a given mode with respect to the spatial distribution of the strain...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28243572/tailoring-bifunctional-hybrid-organic-inorganic-nanoadsorbents-by-the-choice-of-functional-layer-composition-probed-by-adsorption-of-cu-2-ions
#18
Veronika V Tomina, Inna V Melnyk, Yuriy L Zub, Aivaras Kareiva, Miroslava Vaclavikova, Gulaim A Seisenbaeva, Vadim G Kessler
Spherical silica particles with bifunctional (≡Si(CH2)3NH2/≡SiCH3, ≡Si(CH2)3NH2/≡Si(CH2)2(CF2)5CF3) surface layers were produced by a one-step approach using a modified Stöber method in three-component alkoxysilane systems, resulting in greatly increased contents of functional components. The content of functional groups and thermal stability of the surface layers were analyzed by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and (13)C and (29)Si solid-state NMR spectroscopy revealing their composition and organization...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28243571/selective-photodissociation-of-tailored-molecular-tags-as-a-tool-for-quantum-optics
#19
Ugur Sezer, Philipp Geyer, Moritz Kriegleder, Maxime Debiossac, Armin Shayeghi, Markus Arndt, Lukas Felix, Marcel Mayor
Recent progress in synthetic chemistry and molecular quantum optics has enabled demonstrations of the quantum mechanical wave-particle duality for complex particles, with masses exceeding 10 kDa. Future experiments with even larger objects will require new optical preparation and manipulation methods that shall profit from the possibility to cleave a well-defined molecular tag from a larger parent molecule. Here we present the design and synthesis of two model compounds as well as evidence for the photoinduced beam depletion in high vacuum in one case...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28243570/nanoscale-isoindigo-carriers-self-assembly-and-tunable-properties
#20
Tatiana N Pashirova, Andrei V Bogdanov, Lenar I Musin, Julia K Voronina, Irek R Nizameev, Marsil K Kadirov, Vladimir F Mironov, Lucia Ya Zakharova, Shamil K Latypov, Oleg G Sinyashin
Over the last decade isoindigo derivatives have attracted much attention due to their high potential in pharmacy and in the chemistry of materials. In addition, isoindigo derivatives can be modified to form supramolecular structures with tunable morphologies for the use in drug delivery. Amphiphilic long-chain dialkylated isoindigos have the ability to form stable solid nanoparticles via a simple nanoprecipitation technique. Their self-assembly was investigated using tensiometry, dynamic light scattering, spectrophotometry, and fluorometry...
2017: Beilstein Journal of Nanotechnology
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