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Beilstein Journal of Nanotechnology

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https://www.readbyqxmd.com/read/30416926/accurate-control-of-the-covalent-functionalization-of-single-walled-carbon-nanotubes-for-the-electro-enzymatically-controlled-oxidation-of-biomolecules
#1
Naoual Allali, Veronika Urbanova, Mathieu Etienne, Xavier Devaux, Martine Mallet, Brigitte Vigolo, Jean-Joseph Adjizian, Chris P Ewels, Sven Oberg, Alexander V Soldatov, Edward McRae, Yves Fort, Manuel Dossot, Victor Mamane
Single-walled carbon nanotubes (SWCNTs) were functionalized by ferrocene through ethyleneglycol chains of different lengths (FcETGn) and the functionalized SWCNTs (f-SWCNTs) were characterized by different complementary analytical techniques. In particular, high-resolution scanning electron transmission microscopy (HRSTEM) and electron energy loss spectroscopy (EELS) analyses support that the outer tubes of the carbon-nanotube bundles were covalently grafted with FcETGn groups. This result confirms that the electrocatalytic effect observed during the oxidation of the reduced form of nicotinamide adenine dinucleotide (NADH) co-factor by the f-SWCNTs is due to the presence of grafted ferrocene derivatives playing the role of a mediator...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416925/contactless-photomagnetoelectric-investigations-of-2d-semiconductors
#2
Marian Nowak, Marcin Jesionek, Barbara Solecka, Piotr Szperlich, Piotr Duka, Anna Starczewska
Background: Applications of two-dimensional (2D) materials in electronic devices require the development of appropriate measuring methods for determining their typical semiconductor parameters, i.e., mobility and carrier lifetime. Among these methods, contactless techniques and mobility extraction methods based on field-effect measurements are of great importance. Results: Here we show a contactless method for determining these parameters in 2D semiconductors that is based on the photomagnetoelectric (PME) effect (also known as the photoelectromagnetic effect)...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416924/oriented-zinc-oxide-nanorods-a-novel-saturable-absorber-for-lasers-in-the-near-infrared
#3
Pavel Loiko, Tanujjal Bora, Josep Maria Serres, Haohai Yu, Magdalena Aguiló, Francesc Díaz, Uwe Griebner, Valentin Petrov, Xavier Mateos, Joydeep Dutta
Zinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1-2 µm) near-IR absorption ascribed to the singly charged zinc vacancy VZn -1 . The saturable absorption of the ZnO NRs is studied at ≈1 µm under picosecond excitation, revealing a low saturation intensity, ≈10 kW/cm2 , and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (≈1.03 µm) and Tm (≈1...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416923/low-cost-tips-for-tip-enhanced-raman-spectroscopy-fabricated-by-two-step-electrochemical-etching-of-125-%C3%A2%C2%B5m-diameter-gold-wires
#4
Antonino Foti, Francesco Barreca, Enza Fazio, Cristiano D'Andrea, Paolo Matteini, Onofrio Maria Maragò, Pietro Giuseppe Gucciardi
Tip-enhanced Raman spectroscopy (TERS) has become a well-applied technique for nanospectroscopy, allowing for single molecule sensitivity with sub-nanometer spatial resolution. The demand for efficient, reproducible and cost-effective probes for TERS is increasing. Here we report on a new electrochemical etching protocol to fabricate TERS tips starting from 125 µm diameter gold wires in a reproducible way. The process is reliable (50% of the tips have radius of curvature <35 nm, 66% <80 nm), fast (less than 2 min) and 2...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416922/disorder-in-h-irradiated-hopg-effect-of-impinging-energy-and-dose-on-raman-d-band-splitting-and-surface-topography
#5
Lisandro Venosta, Noelia Bajales, Sergio Suárez, Paula G Bercoff
Disorder was induced in pristine highly oriented pyrolytic graphite (HOPG) by irradiation with H+ ions with energies of 0.4 MeV and 1 MeV, and doses of 1014 ions/cm2 and 1016 ions/cm2 . Raman spectroscopy was used as the main technique to characterize different samples and gain new insights on the splitting of the D band into two components (D1 and D2 ), trying to correlate this feature of the vibrational spectrum with the impinging energy and dose. An increased I D2 / I G ratio in comparison with I D1 / I G was observed in the irradiated samples...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416921/optimization-of-mo-cr-bilayer-back-contacts-for-thin-film-solar-cells
#6
Nima Khoshsirat, Fawad Ali, Vincent Tiing Tiong, Mojtaba Amjadipour, Hongxia Wang, Mahnaz Shafiei, Nunzio Motta
Molybdenum (Mo) is the most commonly used material as back contact in thin-film solar cells. Adhesion of Mo film to soda-lime glass (SLG) substrate is crucial to the performance of solar cells. In this study, an optimized bilayer structure made of a thin layer of Mo on an ultra-thin chromium (Cr) adhesion layer is used as the back contact for a copper zinc tin sulfide (CZTS) thin-film solar cell on a SLG substrate. DC magnetron sputtering is used for deposition of Mo and Cr films. The conductivity of Mo/Cr bilayer films, their microstructure and surface morphology are studied at different deposition powers and working pressures...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416920/size-selected-fe-3-o-4-au-hybrid-nanoparticles-for-improved-magnetism-based-theranostics
#7
Maria V Efremova, Yulia A Nalench, Eirini Myrovali, Anastasiia S Garanina, Ivan S Grebennikov, Polina K Gifer, Maxim A Abakumov, Marina Spasova, Makis Angelakeris, Alexander G Savchenko, Michael Farle, Natalia L Klyachko, Alexander G Majouga, Ulf Wiedwald
Size-selected Fe3 O4 -Au hybrid nanoparticles with diameters of 6-44 nm (Fe3 O4 ) and 3-11 nm (Au) were prepared by high temperature, wet chemical synthesis. High-quality Fe3 O4 nanocrystals with bulk-like magnetic behavior were obtained as confirmed by the presence of the Verwey transition. The 25 nm diameter Fe3 O4 -Au hybrid nanomaterial sample (in aqueous and agarose phantom systems) showed the best characteristics for application as contrast agents in magnetic resonance imaging and for local heating using magnetic particle hyperthermia...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416919/silencing-the-second-harmonic-generation-from-plasmonic-nanodimers-a-comprehensive-discussion
#8
Jérémy Butet, Gabriel D Bernasconi, Olivier J F Martin
The silencing of the second harmonic generation process from plasmonic nanostructures corresponds to the limited far-field second harmonic radiation despite the huge fundamental electric field enhancement in the interstice between two plasmonic nanoparticles forming a nanodimer. In this article, we report a comprehensive investigation of this effect using a surface integral equation method. Various geometries are considered, including nanoantennas with cylindrical and rectangular arms as well as nanodimers with surface defects...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416918/two-dimensional-semiconductors-pave-the-way-towards-dopant-based-quantum-computing
#9
José Carlos Abadillo-Uriel, Belita Koiller, María José Calderón
Since the proposal in 1998 to build a quantum computer using dopants in silicon as qubits, much progress has been made in the nanofabrication of semiconductors and the control of charge and spins in single dopants. However, an important problem remains unsolved, namely the control over exchange interactions and tunneling between two donors, which presents a peculiar oscillatory behavior as the dopants relative positions vary at the scale of the lattice parameter. Such behavior is due to the valley degeneracy in the conduction band of silicon, and does not occur when the conduction-band edge is at k = 0...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416917/silicene-germanene-and-other-group-iv-2d-materials
#10
EDITORIAL
Patrick Vogt
No abstract text is available yet for this article.
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416916/polarization-dependent-strong-coupling-between-silver-nanorods-and-photochromic-molecules
#11
Gwénaëlle Lamri, Alessandro Veltri, Jean Aubard, Pierre-Michel Adam, Nordin Felidj, Anne-Laure Baudrion
Active plasmonics is a key focus for the development of advanced plasmonic applications. By selectively exciting the localized surface plasmon resonance sustained by the short or the long axis of silver nanorods, we demonstrate a polarization-dependent strong coupling between the plasmonic resonance and the excited state of photochromic molecules. By varying the width and the length of the nanorods independently, a clear Rabi splitting appears in the dispersion curves of both resonators.
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416915/nanoantenna-structures-for-the-detection-of-phonons-in-nanocrystals
#12
Alexander G Milekhin, Sergei A Kuznetsov, Ilya A Milekhin, Larisa L Sveshnikova, Tatyana A Duda, Ekaterina E Rodyakina, Alexander V Latyshev, Volodymyr M Dzhagan, Dietrich R T Zahn
We report a study of the infrared response by localized surface plasmon resonance (LSPR) modes in gold micro- and nanoantenna arrays with various morphologies and surface-enhanced infrared absorption (SEIRA) by optical phonons of semiconductor nanocrystals (NCs) deposited on the arrays. The arrays of nano- and microantennas fabricated with nano- and photolithography reveal infrared-active LSPR modes of energy ranging from the mid to far-infrared that allow the IR response from very low concentrations of organic and inorganic materials deposited onto the arrays to be analyzed...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416914/nanostructured-liquid-crystal-systems-and-applications
#13
EDITORIAL
Alexei R Khokhlov, Alexander V Emelyanenko
No abstract text is available yet for this article.
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416913/impact-of-the-anodization-time-on-the-photocatalytic-activity-of-tio-2-nanotubes
#14
Jesús A Díaz-Real, Geyla C Dubed-Bandomo, Juan Galindo-de-la-Rosa, Luis G Arriaga, Janet Ledesma-García, Nicolas Alonso-Vante
Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO2 NTs. These properties are at the origin of the photocatalytic activity (PCA), as proved with the photooxidation of methylene blue...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416912/characterization-of-the-microscopic-tribological-properties-of-sandfish-scincus-scincus-scales-by-atomic-force-microscopy
#15
Weibin Wu, Christian Lutz, Simon Mersch, Richard Thelen, Christian Greiner, Guillaume Gomard, Hendrik Hölscher
Lizards of the genus Scincus are widely known under the common name sandfish due to their ability to swim in loose, aeolian sand. Some studies report that this fascinating property of sandfish is accompanied by unique tribological properties of their skin such as ultra-low adhesion, friction and wear. The majority of these reports, however, is based on experiments conducted with a non-standard granular tribometer. Here, we characterise microscopic adhesion, friction and wear of single sandfish scales by atomic force microscopy...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30416911/enhancement-of-x-ray-emission-from-nanocolloidal-gold-suspensions-under-double-pulse-excitation
#16
Wei-Hung Hsu, Frances Camille P Masim, Armandas Balčytis, Hsin-Hui Huang, Tetsu Yonezawa, Aleksandr A Kuchmizhak, Saulius Juodkazis, Koji Hatanaka
Enhancement of X-ray emission was observed from a micro-jet of a nano-colloidal gold suspension in air under double-pulse excitation of ultrashort (40 fs) near-IR laser pulses. Temporal and spatial overlaps between the pre-pulse and the main pulse were optimized for the highest X-ray emission. The maximum X-ray intensity was obtained at a 1-7 ns delay of the main pulse irradiation after the pre-pulse irradiation with the micro-jet position shifted along the laser beam propagation. It was revealed that the volume around gold nanoparticles where the permittivity is near zero, ε ≈ 0, accounts for the strongest absorption, which leads to the effective enhancements of X-ray emission...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30345219/au-si-plasmonic-platforms-synthesis-structure-and-fdtd-simulations
#17
Anna Gapska, Marcin Łapiński, Paweł Syty, Wojciech Sadowski, Józef Eugeniusz Sienkiewicz, Barbara Kościelska
Plasmonic platforms based on Au nanostructures have been successfully synthesized by directional solidification of a eutectic from Au and the substrate. In order to determine homogeneous shape and space distribution, the influence of annealing conditions and the initial thickness of the Au film on the nanostructures was analyzed. For the surface morphology studies, SEM and AFM measurements were performed. The structure of platforms was investigated using XRD and XPS methods. Structural investigations confirmed, that nanostructures consist of metallic Au, growing along the [111] direction...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30345218/pattern-generation-for-direct-write-three-dimensional-nanoscale-structures-via-focused-electron-beam-induced-deposition
#18
Lukas Keller, Michael Huth
Fabrication of three-dimensional (3D) nanoarchitectures by focused electron beam induced deposition (FEBID) has matured to a level that highly complex and functional deposits are becoming available for nanomagnetics and plasmonics. However, the generation of suitable pattern files that control the electron beam's movement, and thereby reliably map the desired target 3D structure from a purely geometrical description to a shape-conforming 3D deposit, is nontrivial. To address this issue we developed several writing strategies and associated algorithms implemented in C++...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30345217/effective-sensor-properties-and-sensitivity-considerations-of-a-dynamic-co-resonantly-coupled-cantilever-sensor
#19
Julia Körner
Background: Co-resonant coupling of a micro- and a nanocantilever can be introduced to significantly enhance the sensitivity of dynamic-mode cantilever sensors while maintaining the ease of detection. Experimentally, a low-stiffness nanocantilever is coupled to an easy to read out microcantilever and the eigenfrequencies of both beams are brought close to one another. This results in a strong interplay between both beams and, hence, any interaction applied at the nanocantilever alters the oscillatory state of the coupled system as a whole and can be detected at the microcantilever...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30345216/cytotoxicity-of-doxorubicin-conjugated-poly-n-2-hydroxypropyl-methacrylamide-modified-%C3%AE-fe-2-o-3-nanoparticles-towards-human-tumor-cells
#20
Zdeněk Plichta, Yulia Kozak, Rostyslav Panchuk, Viktoria Sokolova, Matthias Epple, Lesya Kobylinska, Pavla Jendelová, Daniel Horák
Doxorubicin-conjugated magnetic nanoparticles containing hydrolyzable hydrazone bonds were developed using a non-toxic poly[ N -(2-hydroxypropyl)methacrylamide] (PHPMA) coating, which ensured good colloidal stability in aqueous media and limited internalization by the cells, however, enabled adhesion to the cell surface. While the neat PHPMA-coated particles proved to be non-toxic, doxorubicin-conjugated particles exhibited enhanced cytotoxicity in both drug-sensitive and drug-resistant tumor cells compared to free doxorubicin...
2018: Beilstein Journal of Nanotechnology
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