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Beilstein Journal of Nanotechnology

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https://read.qxmd.com/read/30746322/a-ni-oh-2-nanopetals-network-for-high-performance-supercapacitors-synthesized-by-immersing-ni-nanofoam-in-water
#1
Donghui Zheng, Man Li, Yongyan Li, Chunling Qin, Yichao Wang, Zhifeng Wang
Developing a facile and environmentally friendly approach to the synthesis of nanostructured Ni(OH)2 electrodes for high-performance supercapacitor applications is a great challenge. In this work, we report an extremely simple route to prepare a Ni(OH)2 nanopetals network by immersing Ni nanofoam in water. A binder-free composite electrode, consisting of Ni(OH)2 nanopetals network, Ni nanofoam interlayer and Ni-based metallic glass matrix (Ni(OH)2 /Ni-NF/MG) with sandwich structure and good flexibility, was designed and finally achieved...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746321/site-specific-growth-of-oriented-zno-nanocrystal-arrays
#2
Rekha Bai, Dinesh K Pandya, Sujeet Chaudhary, Veer Dhaka, Vladislav Khayrudinov, Jori Lemettinen, Christoffer Kauppinen, Harri Lipsanen
We report on the growth of ZnO nanocrystals having a hexagonal, prismatic shape, sized 700 nm × 600 nm, on bare indium tin oxide (ITO) substrates. The growth is induced by a low ion flux and involves a low-temperature electrodeposition technique. Further, vertically aligned periodic nanocrystal (NC) growth is engineered at predefined positions on polymer-coated ITO substrates patterned with ordered pores. The vertical alignment of ZnO NCs along the c -axis is achieved via ion-by-ion nucleation-controlled growth for patterned pores of size ≈600 nm; however, many-coupled branched NCs with hexagonal shape are formed when a patterned pore size of ≈200 nm is used...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746320/removal-of-toxic-heavy-metals-from-river-water-samples-using-a-porous-silica-surface-modified-with-a-new-%C3%AE-ketoenolic-host
#3
Said Tighadouini, Smaail Radi, Abderrahman Elidrissi, Khadija Haboubi, Maryse Bacquet, Stéphanie Degoutin, Mustapha Zaghrioui, Yann Garcia
A new hybrid adsorbent material for the efficient removal of heavy metals from natural real water solutions (Moroccan river water samples) was prepared by the immobilization of a new conjugated β-ketoenol-pyridine-furan ligand onto a silica matrix. The thermodynamical properties including pH, adsorption isotherms, competitive adsorption, selectivity and regeneration were studied to investigate the effect of ketoenol-pyridine-furan-silica (SiNL) on the removal of Zn(II), Pb(II), Cd(II) and Cu(II) from aqueous solutions...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746319/relation-between-thickness-crystallite-size-and-magnetoresistance-of-nanostructured-la-1-x-sr-x-mn-y-o-3%C3%A2-%C3%AE-films-for-magnetic-field-sensors
#4
Rasuole Lukose, Valentina Plausinaitiene, Milita Vagner, Nerija Zurauskiene, Skirmantas Kersulis, Virgaudas Kubilius, Karolis Motiejuitis, Birute Knasiene, Voitech Stankevic, Zita Saltyte, Martynas Skapas, Algirdas Selskis, Evaldas Naujalis
In the present study the advantageous pulsed-injection metal organic chemical vapour deposition (PI-MOCVD) technique was used for the growth of nanostructured La1- x Sr x Mn y O3±δ (LSMO) films on ceramic Al2 O3 substrates. The compositional, structural and magnetoresistive properties of the nanostructured manganite were changed by variation of the processing conditions: precursor solution concentration, supply frequency and number of supply sources during the PI-MOCVD growth process. The results showed that the thick (≈400 nm) nanostructured LSMO films, grown using an additional supply source of precursor solution in an exponentially decreasing manner, exhibit the highest magnetoresistance and the lowest magnetoresistance anisotropy...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746318/magnetic-field-sensor-with-self-reference-characteristic-based-on-a-magnetic-fluid-and-independent-plasmonic-dual-resonances
#5
Kun Ren, Xiaobin Ren, Yumeng He, Qun Han
A magnetic-field sensor with self-reference characteristic based on metal-dielectric-metal (MDM) plasmonic waveguides and a magnetic fluid (MF) is proposed and theoretically investigated. Independent dual resonances are supported by the coupled resonator-waveguide system. The physical mechanisms of dual resonances are analyzed by the temporal coupled-mode theory. The transmission response to an external magnetic field is explored by using the remarkable tunability of the refractive index of the MF. Based on the different dependence of two resonances on the external field, a magnetic-field sensor with self-reference characteristic is achieved...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746317/interaction-of-te-and-se-interlayers-with-ag-or-au-nanofilms-in-sandwich-structures
#6
Arkadiusz Ciesielski, Lukasz Skowronski, Marek Trzcinski, Ewa Górecka, Wojciech Pacuski, Tomasz Szoplik
Noble metal nanolayers on flat substrates are often deposited with the use of semiconductor interlayers, which may strongly interact with the noble metal overlayer. We investigated the crystallinity, atomic concentration profile and optical parameters of ≈35 nm-thick silver and gold layers deposited on glass substrates with 2 nm-thick tellurium or selenium interlayers. Our study, based on X-ray reflectometry (XRR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ellipsometric measurements, showed that using either of these interlayers introduces strain in nanocrystals of both plasmonic films...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746316/thermal-control-of-the-defunctionalization-of-supported-au-25-glutathione-18-catalysts-for-benzyl-alcohol-oxidation
#7
Zahraa Shahin, Hyewon Ji, Rodica Chiriac, Nadine Essayem, Franck Rataboul, Aude Demessence
Au25 (SG)18 (SG - glutathione) clusters deposited on ZrO2 nanoparticles have been used as a catalyst for benzyl alcohol oxidation. Calcination was performed at different temperatures to study the ligand and particle size effect on the catalytic activity. In contrast to most gold nanoclusters which have to be completely defunctionalized for maximum catalytic activity, the partially defunctionalized Au25 (SG)18 @ZrO2 catalyst, thermally treated at 300 °C, exhibits full conversion of benzyl alcohol within 15 h under atmospheric pressure with 94% selectivity towards benzaldehyde...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746315/raman-study-of-flash-lamp-annealed-aqueous-cu-2-znsns-4-nanocrystals
#8
Yevhenii Havryliuk, Oleksandr Selyshchev, Mykhailo Valakh, Alexandra Raevskaya, Oleksandr Stroyuk, Constance Schmidt, Volodymyr Dzhagan, Dietrich R T Zahn
The effect of flash-lamp annealing (FLA) on the re-crystallization of thin films made of colloidal Cu2 ZnSnS4 nanocrystals (NCs) is investigated by Raman spectroscopy. Unlike similar previous studies of NCs synthesized at high temperatures in organic solvents, NCs in this work, which have diameters as small as 2-6 nm, were synthesized under environmentally friendly conditions in aqueous solution using small molecules as stabilizers. We establish the range of FLA conditions providing an efficient re-crystallization in the thin film of NCs, while preserving their kesterite structure and improving their crystallinity remarkably...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746314/study-of-silica-based-intrinsically-emitting-nanoparticles-produced-by-an-excimer-laser
#9
Imène Reghioua, Mattia Fanetti, Sylvain Girard, Diego Di Francesca, Simonpietro Agnello, Layla Martin-Samos, Marco Cannas, Matjaz Valant, Melanie Raine, Marc Gaillardin, Nicolas Richard, Philippe Paillet, Aziz Boukenter, Youcef Ouerdane, Antonino Alessi
We report an experimental study demonstrating the feasibility to produce both pure and Ge-doped silica nanoparticles (size ranging from tens up to hundreds of nanometers) using nanosecond pulsed KrF laser ablation of bulk glass. In particular, pure silica nanoparticles were produced using a laser pulse energy of 400 mJ on pure silica, whereas Ge-doped nanoparticles were obtained using 33 and 165 mJ per pulse on germanosilicate glass. The difference in the required energy is attributed to the Ge doping, which modifies the optical properties of the silica by facilitating energy absorption processes such as multiphoton absorption or by introducing absorbing point defects...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746313/uniform-sb-2-s-3-optical-coatings-by-chemical-spray-method
#10
Jako S Eensalu, Atanas Katerski, Erki Kärber, Ilona Oja Acik, Arvo Mere, Malle Krunks
Antimony sulfide (Sb2 S3 ), an environmentally benign material, has been prepared by various deposition methods for use as a solar absorber due to its direct band gap of ≈1.7 eV and high absorption coefficient in the visible light spectrum (1.8 × 105 cm-1 at 450 nm). Rapid, scalable, economically viable and controllable in-air growth of continuous, uniform, polycrystalline Sb2 S3 absorber layers has not yet been accomplished. This could be achieved with chemical spray pyrolysis, a robust chemical method for deposition of thin films...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746312/mechanism-of-silica-lysozyme-composite-formation-unravelled-by-in-situ-fast-saxs
#11
Tomasz M Stawski, Daniela B van den Heuvel, Rogier Besselink, Dominique J Tobler, Liane G Benning
A quantitative understanding of aggregation mechanisms leading to the formation of composites of inorganic nanoparticles (NPs) and proteins in aqueous media is of paramount interest for colloid chemistry. In particular, the interactions between silica (SiO2 ) NPs and lysozyme (LZM) have attracted attention, because LZM is well-known to adsorb strongly to silica NPs, while at the same time preserving its enzymatic activity. The inherent nature of the aggregation processes leading to NP-LZM composites involves structural changes at length scales from few to at least hundreds of nanometres but also time scales much smaller than one second...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30746311/targeting-strategies-for-improving-the-efficacy-of-nanomedicine-in-oncology
#12
REVIEW
Gonzalo Villaverde, Alejandro Baeza
The use of nanoparticles as drug carriers has provided a powerful weapon in the fight against cancer. These nanocarriers are able to transport drugs that exhibit very different nature such as lipophilic or hydrophilic drugs and big macromolecules as proteins or RNA. Moreover, the external surface of these carriers can be decorated with different moieties with high affinity for specific membrane receptors of the tumoral cells to direct their action specifically to the malignant cells. The selectivity improvement yielded by these nanocarriers provided a significative enhancement in the efficacy of the transported drug, while the apparition of side effects in the host was reduced...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680288/nanoporous-water-oxidation-electrodes-with-a-low-loading-of-laser-deposited-ru-c-exhibit-enhanced-corrosion-stability
#13
Sandra Haschke, Dmitrii Pankin, Vladimir Mikhailovskii, Maïssa K S Barr, Adriana Both-Engel, Alina Manshina, Julien Bachmann
For the oxidation of water to dioxygen, oxide-covered ruthenium metal is known as the most efficient catalyst, however, with limited stability. Herein, we present a strategy for incorporating a Ru/C composite onto a novel nanoporous electrode surface with low noble metal loading and improved stability. The Ru/C is coated on the pore walls of anodic alumina templates in a one-step laser-induced deposition method from Ru3 (CO)12 solutions. Scanning electron microscopy proves the presence of a continuous Ru/C layer along the inner pore walls...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680287/ph-mediated-control-over-the-mesostructure-of-ordered-mesoporous-materials-templated-by-polyion-complex-micelles
#14
Emilie Molina, Mélody Mathonnat, Jason Richard, Patrick Lacroix-Desmazes, Martin In, Philippe Dieudonné, Thomas Cacciaguerra, Corine Gérardin, Nathalie Marcotte
Ordered mesoporous silica materials were prepared under different pH conditions by using a silicon alkoxide as a silica source and polyion complex (PIC) micelles as the structure-directing agents. PIC micelles were formed by complexation between a weak polyacid-containing double-hydrophilic block copolymer, poly(ethylene oxide)- b -poly(acrylic acid) (PEO- b -PAA), and a weak polybase, oligochitosan-type polyamine. As both the micellization process and the rate of silica condensation are highly dependent on pH, the properties of silica mesostructures can be modulated by changing the pH of the reaction medium...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680286/sputtering-of-silicon-nanopowders-by-an-argon-cluster-ion-beam
#15
Xiaomei Zeng, Vasiliy Pelenovich, Zhenguo Wang, Wenbin Zuo, Sergey Belykh, Alexander Tolstogouzov, Dejun Fu, Xiangheng Xiao
In this work an Ar+ cluster ion beam with energy in the range of 10-70 keV and dose of 7.2 × 1014 -2.3 × 1016 cluster/cm2 was used to irradiate pressed Si nanopowder targets consisting of particles with a mean diameter of 60 nm. The influence of the target density and the cluster ion beam parameters (energy and dose) on the sputtering depth and sputtering yield was studied. The sputtering yield was found to decrease with increasing dose and target density. The energy dependence demonstrated an unusual non-monotonic behavior...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680285/scanning-probe-microscopy-for-energy-related-materials
#16
EDITORIAL
Rüdiger Berger, Benjamin Grévin, Philippe Leclère, Yi Zhang
No abstract text is available yet for this article.
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680284/new-micro-mesoporous-nanocomposite-material-from-low-cost-sources-for-the-efficient-removal-of-aromatic-and-pathogenic-pollutants-from-water
#17
Emmanuel I Unuabonah, Robert Nöske, Jens Weber, Christina Günter, Andreas Taubert
A new micro/mesoporous hybrid clay nanocomposite prepared from kaolinite clay, Carica papaya seeds, and ZnCl2 via calcination in an inert atmosphere is presented. Regardless of the synthesis temperature, the specific surface area of the nanocomposite material is between ≈150 and 300 m2 /g. The material contains both micro- and mesopores in roughly equal amounts. X-ray diffraction, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy suggest the formation of several new bonds in the materials upon reaction of the precursors, thus confirming the formation of a new hybrid material...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680283/wet-chemistry-route-for-the-decoration-of-carbon-nanotubes-with-iron-oxide-nanoparticles-for-gas-sensing
#18
Hussam M Elnabawy, Juan Casanova-Chafer, Badawi Anis, Mostafa Fedawy, Mattia Scardamaglia, Carla Bittencourt, Ahmed S G Khalil, Eduard Llobet, Xavier Vilanova
In this work, we investigated the parameters for decorating multiwalled carbon nanotubes with iron oxide nanoparticles using a new, inexpensive approach based on wet chemistry. The effect of process parameters such as the solvent used, the amount of iron salt or the calcination time on the morphology, decoration density and nanocluster size were studied. With the proposed approach, the decoration density can be adjusted by selecting the appropriate ratio of carbon nanotubes/iron salt, while nanoparticle size can be modulated by controlling the calcination period...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680282/graphene-graphite-hybrid-epoxy-composites-with-controllable-workability-for-thermal-management
#19
Idan Levy, Eyal Merary Wormser, Maxim Varenik, Matat Buzaglo, Roey Nadiv, Oren Regev
The substantial heat generation in highly dense electronic devices requires the use of materials tailored to facilitate efficient thermal management. The design of such materials may be based on the loading of thermally conductive fillers into the polymer matrix applied - as a thermal interface material - on the interface between two surfaces to reduce contact resistance. On the one hand, these additives enhance the thermal conductivity of the composite, but on the other hand, they increase the viscosity of the composite and hence impair its workability...
2019: Beilstein Journal of Nanotechnology
https://read.qxmd.com/read/30680281/pull-off-and-friction-forces-of-micropatterned-elastomers-on-soft-substrates-the-effects-of-pattern-length-scale-and-stiffness
#20
Peter van Assenbergh, Marike Fokker, Julian Langowski, Jan van Esch, Marleen Kamperman, Dimitra Dodou
The adhesiveness of biological micropatterned adhesives primarily relies on their geometry (e.g., feature size, architecture) and material properties (e.g., stiffness). Over the last few decades, researchers have been mimicking the geometry and material properties of biological micropatterned adhesives. The performance of these biomimetic micropatterned adhesives is usually tested on hard substrates. Much less is known about the effect of geometry, feature size, and material properties on the performance of micropatterned adhesives when the substrate is deformable...
2019: Beilstein Journal of Nanotechnology
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