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Beilstein Journal of Nanotechnology

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https://www.readbyqxmd.com/read/28546899/assembly-of-metallic-nanoparticle-arrays-on-glass-via-nanoimprinting-and-thin-film-dewetting
#1
Sun-Kyu Lee, Sori Hwang, Yoon-Kee Kim, Yong-Jun Oh
We propose a nanofabrication process to generate large-area arrays of noble metal nanoparticles on glass substrates via nanoimprinting and dewetting of metallic thin films. Glass templates were made via pattern transfer from a topographic Si mold to an inorganically cross-linked sol-gel (IGSG) resist on glass using a two-layer polydimethylsiloxane (PDMS) stamp followed by annealing, which turned the imprinted resist into pure silica. The transparent, topographic glass successfully templated the assembly of Au and Ag nanoparticle arrays via thin-film deposition and dewetting at elevated temperatures...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546898/treatment-of-fly-ash-from-power-plants-using-thermal-plasma
#2
Sulaiman Al-Mayman, Ibrahim AlShunaifi, Abdullah Albeladi, Imed Ghiloufi, Saud Binjuwair
Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546897/structural-properties-and-thermal-stability-of-cobalt-and-chromium-doped-%C3%AE-mno2-nanorods
#3
Romana Cerc Korošec, Polona Umek, Alexandre Gloter, Jana Padežnik Gomilšek, Peter Bukovec
α-MnO2 nanorods were synthesized via the hydrothermal decomposition of KMnO4 in an acidic environment in the presence of Co(2+) and Cr(3+) ions. Reactions were carried out at three different temperatures: 90, 130 and 170 °C. All prepared samples exhibit a tetragonal MnO2 crystalline phase. SEM-EDS analysis shows that cobalt cations are incorporated to a higher degree into the MnO2 framework than chromium ions, and that the content of the dopant ions decreases with increasing reaction temperature. The oxidation of Co(2+) to Co(3+) during the reaction was proved by an XANES study, while EXAFS results confirm that both dopant ions substitute Mn(4+) in the center of an octahedron...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546896/study-of-the-correlation-between-sensing-performance-and-surface-morphology-of-inkjet-printed-aqueous-graphene-based-chemiresistors-for-no2-detection
#4
F Villani, C Schiattarella, T Polichetti, R Di Capua, F Loffredo, B Alfano, M L Miglietta, E Massera, L Verdoliva, G Di Francia
The extremely high sensitivity to the external environment and the high specific surface area, as well as the absence of bulk phenomena that could interfere with the response signal, make graphene highly attractive for the applications in the field of sensing. Among the various methods for producing graphene over large areas, liquid phase exfoliation (LPE) appears to be very promising, especially if combined with inkjet printing (IJP), which offers several advantages, including the selective and controlled deposition of small ink volumes and the versatility of the exploitable inks and substrates...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546895/cvd-transfer-free-graphene-for-sensing-applications
#5
Chiara Schiattarella, Sten Vollebregt, Tiziana Polichetti, Brigida Alfano, Ettore Massera, Maria Lucia Miglietta, Girolamo Di Francia, Pasqualina Maria Sarro
The sp(2) carbon-based allotropes have been extensively exploited for the realization of gas sensors in the recent years because of their high conductivity and large specific surface area. A study on graphene that was synthetized by means of a novel transfer-free fabrication approach and is employed as sensing material is herein presented. Multilayer graphene was deposited by chemical vapour deposition (CVD) mediated by CMOS-compatible Mo. The utilized technique takes advantage of the absence of damage or contamination of the synthesized graphene, because there is no need for the transfer onto a substrate...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546894/needs-and-challenges-for-assessing-the-environmental-impacts-of-engineered-nanomaterials-enms
#6
REVIEW
Michelle Romero-Franco, Hilary A Godwin, Muhammad Bilal, Yoram Cohen
The potential environmental impact of nanomaterials is a critical concern and the ability to assess these potential impacts is top priority for the progress of sustainable nanotechnology. Risk assessment tools are needed to enable decision makers to rapidly assess the potential risks that may be imposed by engineered nanomaterials (ENMs), particularly when confronted by the reality of limited hazard or exposure data. In this review, we examine a range of available risk assessment frameworks considering the contexts in which different stakeholders may need to assess the potential environmental impacts of ENMs...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546893/btex-detection-with-composites-of-ethylenevinyl-acetate-and-nanostructured-carbon
#7
Santa Stepina, Astrida Berzina, Gita Sakale, Maris Knite
By using a solvent-based method composites of ethylenevinyl acetate copolymer and carbon black (EVA-CB) were synthesized for sensing BTEX (benzene, toluene, ethylbenzene and xylene) vapours. The composites were characterized using atomic force microscopy (AFM) in an electroconductive mode. Gas sensing results show that EVA-CB can reproducibly detect BTEX and that the response increases linearly with vapour concentration. Compared to gas-sensing measurements of gasoline vapours, the responses with toluene and ethylbenzene are different and can be explained by varying side chains of the benzene ring...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546892/nanoantenna-assisted-plasmonic-enhancement-of-ir-absorption-of-vibrational-modes-of-organic-molecules
#8
Alexander G Milekhin, Olga Cherkasova, Sergei A Kuznetsov, Ilya A Milekhin, Ekatherina E Rodyakina, Alexander V Latyshev, Sreetama Banerjee, Georgeta Salvan, Dietrich R T Zahn
Nanoantenna-assisted plasmonic enhancement of IR absorption and Raman scattering was employed for studying the vibrational modes in organic molecules. Ultrathin cobalt phthalocyanine films (3 nm) were deposited on Au nanoantenna arrays with specified structural parameters. The deposited organic films reveal the enhancement of both Raman scattering and IR absorption vibrational modes. To extend the possibility of implementing surface-enhanced infrared absorption (SEIRA) for biological applications, the detection and analysis of the steroid hormone cortisol was demonstrated...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546891/scaling-law-to-determine-peak-forces-in-tapping-mode-afm-experiments-on-finite-elastic-soft-matter-systems
#9
Horacio V Guzman
Analytical equations to estimate the peak force will facilitate the interpretation and the planning of amplitude-modulation force microscopy (tapping mode) experiments. A closed-form analytical equation to estimate the tip-sample peak forces while imaging soft materials in liquid environment and within an elastic deformation regime has been deduced. We have combined a multivariate regression method with input from the virial-dissipation equations and Tatara's bidimensional deformation contact mechanics model...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546890/near-field-surface-plasmon-field-enhancement-induced-by-rippled-surfaces
#10
Mario D'Acunto, Francesco Fuso, Ruggero Micheletto, Makoto Naruse, Francesco Tantussi, Maria Allegrini
The occurrence of plasmon resonances on metallic nanometer-scale structures is an intrinsically nanoscale phenomenon, given that the two resonance conditions (i.e., negative dielectric permittivity and large free-space wavelength in comparison with system dimensions) are realized at the same time on the nanoscale. Resonances on surface metallic nanostructures are often experimentally found by probing the structures under investigation with radiation of various frequencies following a trial-and-error method...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546889/tuning-the-spin-coherence-time-of-cu-ii-bis-oxamato-and-cu-ii-bis-oxamidato-complexes-by-advanced-esr-pulse-protocols
#11
Ruslan Zaripov, Evgeniya Vavilova, Iskander Khairuzhdinov, Kev Salikhov, Violeta Voronkova, Mohammad A Abdulmalic, Francois E Meva, Saddam Weheabby, Tobias Rüffer, Bernd Büchner, Vladislav Kataev
We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time Tm at different temperatures with the two-pulse primary echo and with the special Carr-Purcell-Meiboom-Gill (CPMG) multiple microwave pulse sequence...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546888/vapor-phase-synthesized-fluoroacrylate-polymer-thin-films-thermal-stability-and-structural-properties
#12
Paul Christian, Anna Maria Coclite
In this study, the thermal, chemical and structural stability of 1H,1H,2H,2H-perfluorodecyl acrylate polymers (p-PFDA) synthetized by initiated chemical vapor deposition (iCVD) were investigated. PFDA polymers are known for their interesting crystalline aggregation into a lamellar structure that induces super-hydrophobicity and oleophobicity. Nevertheless, when considering applications which involve chemical, mechanical and thermal stresses, it is important to know the limits under which the crystalline aggregation and the resulting polymer properties are stable...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546887/energy-level-alignment-at-interfaces-between-manganese-phthalocyanine-and-c60
#13
Daniel Waas, Florian Rückerl, Martin Knupfer, Bernd Büchner
We have used photoelectron spectroscopy to determine the energy-level alignment at organic heterojunctions made of manganese phthalocyanine (MnPc) and the fullerene C60. We show that this energy-level alignment depends upon the preparation sequence, which is explained by different molecular orientations. Moreover, our results demonstrate that MnPc/C60 interfaces are hardly suited for application in organic photovoltaic devices, since the energy difference of the two lowest unoccupied molecular orbitals (LUMOs) is rather small...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546886/high-photocatalytic-activity-of-fe2o3-tio2-nanocomposites-prepared-by-photodeposition-for-degradation-of-2-4-dichlorophenoxyacetic-acid
#14
Shu Chin Lee, Hendrik O Lintang, Leny Yuliati
Two series of Fe2O3/TiO2 samples were prepared via impregnation and photodeposition methods. The effect of preparation method on the properties and performance of Fe2O3/TiO2 for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) under UV light irradiation was examined. The Fe2O3/TiO2 nanocomposites prepared by impregnation showed lower activity than the unmodified TiO2, mainly due to lower specific surface area caused by heat treatment. On the other hand, the Fe2O3/TiO2 nanocomposites prepared by photodeposition showed higher photocatalytic activity than the unmodified TiO2...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503401/bio-inspired-micro-to-nanoporous-polymers-with-tunable-stiffness
#15
Julia Syurik, Ruth Schwaiger, Prerna Sudera, Stephan Weyand, Siegbert Johnsen, Gabriele Wiegand, Hendrik Hölscher
Background: Inspired by structural hierarchies and the related excellent mechanical properties of biological materials, we created a smoothly graded micro- to nanoporous structure from a thermoplastic polymer. Results: The viscoelastic properties for the different pore sizes were investigated in the glassy regime by dynamic flat-punch indentation. Interestingly, the storage modulus was observed to increase with increasing pore-area fraction. Conclusion: This outcome appears counterintuitive at first sight, but can be rationalized by an increase of the pore wall thickness as determined by our quantitative analysis of the pore structure...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503400/triptycene-terminated-thiolate-and-selenolate-monolayers-on-au-111
#16
Jinxuan Liu, Martin Kind, Björn Schüpbach, Daniel Käfer, Stefanie Winkler, Wenhua Zhang, Andreas Terfort, Christof Wöll
To study the implications of highly space-demanding organic moieties on the properties of self-assembled monolayers (SAMs), triptycyl thiolates and selenolates with and without methylene spacers on Au(111) surfaces were comprehensively studied using ultra-high vacuum infrared reflection absorption spectroscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy and thermal desorption spectroscopy. Due to packing effects, the molecules in all monolayers are substantially tilted...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503399/functional-dependence-of-resonant-harmonics-on-nanomechanical-parameters-in-dynamic-mode-atomic-force-microscopy
#17
Federico Gramazio, Matteo Lorenzoni, Francesc Pérez-Murano, Enrique Rull Trinidad, Urs Staufer, Jordi Fraxedas
We present a combined theoretical and experimental study of the dependence of resonant higher harmonics of rectangular cantilevers of an atomic force microscope (AFM) as a function of relevant parameters such as the cantilever force constant, tip radius and free oscillation amplitude as well as the stiffness of the sample's surface. The simulations reveal a universal functional dependence of the amplitude of the 6th harmonic (in resonance with the 2nd flexural mode) on these parameters, which can be expressed in terms of a gun-shaped function...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503398/synthesis-of-coaxial-nanotubes-of-polyaniline-and-poly-hydroxyethyl-methacrylate-by-oxidative-initiated-chemical-vapor-deposition
#18
Alper Balkan, Efe Armagan, Gozde Ozaydin Ince
Vapor-phase synthesis techniques of polymeric nanostructures offer unique advantages over conventional, solution-based techniques because of their solventless nature. In this work, we report the fabrication of coaxial polymer nanotubes using two different chemical vapor deposition methods. The fabrication process involves the deposition of an outer layer of the conductive polyaniline (PANI) by oxidative chemical vapor deposition, followed by the deposition of the inner layer of poly(2-hydroxyethyl methacrylate) (pHEMA) hydrogel by initiated chemical vapor deposition...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503397/relationships-between-chemical-structure-mechanical-properties-and-materials-processing-in-nanopatterned-organosilicate-fins
#19
Gheorghe Stan, Richard S Gates, Qichi Hu, Kevin Kjoller, Craig Prater, Kanwal Jit Singh, Ebony Mays, Sean W King
The exploitation of nanoscale size effects to create new nanostructured materials necessitates the development of an understanding of relationships between molecular structure, physical properties and material processing at the nanoscale. Numerous metrologies capable of thermal, mechanical, and electrical characterization at the nanoscale have been demonstrated over the past two decades. However, the ability to perform nanoscale molecular/chemical structure characterization has only been recently demonstrated with the advent of atomic-force-microscopy-based infrared spectroscopy (AFM-IR) and related techniques...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28503396/hybrid-nanomaterials-from-the-laboratory-to-the-market
#20
EDITORIAL
Verónica de Zea Bermudez, Fabrice Leroux, Pierre Rabu, Andreas Taubert
No abstract text is available yet for this article.
2017: Beilstein Journal of Nanotechnology
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