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Beilstein Journal of Nanotechnology

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https://www.readbyqxmd.com/read/29765809/ag-2-wo-4-nanorods-decorated-with-agi-nanoparticles-novel-and-efficient-visible-light-driven-photocatalysts-for-the-degradation-of-water-pollutants
#1
Shijie Li, Shiwei Hu, Wei Jiang, Yanping Liu, Yu Liu, Yingtang Zhou, Liuye Mo, Jianshe Liu
To develop efficient and stable visible-light-driven (VLD) photocatalysts for pollutant degradation, we synthesized novel heterojunction photocatalysts comprised of AgI nanoparticle-decorated Ag2 WO4 nanorods via a facile method. Various characterization techniques, including XRD, SEM, TEM, EDX, and UV-vis DRS were used to investigate the morphology and optical properties of the as-prepared AgI/Ag2 WO4 catalyst. With AgI acting as the cocatalyst, the resulting AgI/Ag2 WO4 heterostructure shows excellent performance in degrading toxic, stable pollutants such as rhodamine B (RhB), methyl orange (MO) and para -chlorophenol (4-CP)...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765808/induced-smectic-phase-in-binary-mixtures-of-twist-bend-nematogens
#2
Anamarija Knežević, Irena Dokli, Marin Sapunar, Suzana Šegota, Ute Baumeister, Andreja Lesac
The investigation of liquid crystal (LC) mixtures is of great interest in tailoring material properties for specific applications. The recent discovery of the twist-bend nematic phase (NTB ) has sparked great interest in the scientific community, not only from a fundamental viewpoint, but also due to its potential for innovative applications. Here we report on the unexpected phase behaviour of a binary mixture of twist-bend nematogens. A binary phase diagram for mixtures of imino-linked cyanobiphenyl (CBI) dimer and imino-linked benzoyloxy-benzylidene (BB) dimer shows two distinct domains...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765807/formation-and-development-of-nanometer-sized-cybotactic-clusters-in-bent-core-nematic-liquid-crystalline-compounds
#3
Yuri P Panarin, Sithara P Sreenilayam, Jagdish K Vij, Anne Lehmann, Carsten Tschierske
Two homologue achiral bent-core liquid crystals (LCs), BCN66 and BCN84, in their nematic phases are studied by dielectric spectroscopy in the frequency range 10 Hz-10 MHz. In each of these compounds, two relaxation processes are identified and assigned to (i) collective dynamics of molecules in nanometer-sized cybotactic clusters and (ii) individual molecular relaxations, in the ascending order of frequency of the probe field. The temperature and the bias electric field dependence of the dielectric strength and relaxation frequency for these processes are shown to give rise to sharpness in cluster boundaries, increased size and volume fraction in the LC nematic phase...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765806/formation-mechanisms-of-boron-oxide-films-fabricated-by-large-area-electron-beam-induced-deposition-of-trimethyl-borate
#4
Aiden A Martin, Philip J Depond
Boron-containing materials are increasingly drawing interest for the use in electronics, optics, laser targets, neutron absorbers, and high-temperature and chemically resistant ceramics. In this article, the first investigation into the deposition of boron-based material via electron beam-induced deposition (EBID) is reported. Thin films were deposited using a novel, large-area EBID system that is shown to deposit material at rates comparable to conventional techniques such as laser-induced chemical vapor deposition...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765805/artifacts-in-time-resolved-kelvin-probe-force-microscopy
#5
Sascha Sadewasser, Nicoleta Nicoara, Santiago D Solares
Kelvin probe force microscopy (KPFM) has been used for the characterization of metals, insulators, and semiconducting materials on the nanometer scale. Especially in semiconductors, the charge dynamics are of high interest. Recently, several techniques for time-resolved measurements with time resolution down to picoseconds have been developed, many times using a modulated excitation signal, e.g., light modulation or bias modulation that induces changes in the charge carrier distribution. For fast modulation frequencies, the KPFM controller measures an average surface potential, which contains information about the involved charge carrier dynamics...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765804/proximity-effect-in-a-two-dimensional-electron-gas-coupled-to-a-thin-superconducting-layer
#6
Christopher Reeg, Daniel Loss, Jelena Klinovaja
There have recently been several experiments studying induced superconductivity in semiconducting two-dimensional electron gases that are strongly coupled to thin superconducting layers, as well as probing possible topological phases supporting Majorana bound states in such setups. We show that a large band shift is induced in the semiconductor by the superconductor in this geometry, thus making it challenging to realize a topological phase. Additionally, we show that while increasing the thickness of the superconducting layer reduces the magnitude of the band shift, it also leads to a more significant renormalization of the semiconducting material parameters and does not reduce the challenge of tuning into a topological phase...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765803/the-electrical-conductivity-of-cnt-graphene-composites-a-new-method-for-accelerating-transmission-function-calculations
#7
Olga E Glukhova, Dmitriy S Shmygin
We present a new universal method to accelerate calculations of transmission function and electrical conductance of 2D materials, the supercell of which may contain hundreds or thousands of atoms. The verification of the proposed method is carried out by exemplarily calculating the electrical characteristics of graphene and graphane films. For the first time, we calculated the transmission function and electrical conductance of pillared graphene, composite film of carbon nanotubes (CNTs)/graphene. The electrical conductance of different models of this material was calculated in two mutually perpendicular directions...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765802/computational-exploration-of-two-dimensional-silicon-diarsenide-and-germanium-arsenide-for-photovoltaic-applications
#8
Sri Kasi Matta, Chunmei Zhang, Yalong Jiao, Anthony O'Mullane, Aijun Du
The properties of bulk compounds required to be suitable for photovoltaic applications, such as excellent visible light absorption, favorable exciton formation, and charge separation are equally essential for two-dimensional (2D) materials. Here, we systematically study 2D group IV-V compounds such as SiAs2 and GeAs2 with regard to their structural, electronic and optical properties using density functional theory (DFT), hybrid functional and Bethe-Salpeter equation (BSE) approaches. We find that the exfoliation of single-layer SiAs2 and GeAs2 is highly feasible and in principle could be carried out experimentally by mechanical cleavage due to the dynamic stability of the compounds, which is inferred by analyzing their vibrational normal mode...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765801/atomistic-modeling-of-tribological-properties-of-pd-and-al-nanoparticles-on-a-graphene-surface
#9
Alexei Khomenko, Miroslav Zakharov, Denis Boyko, Bo N J Persson
Background: The frictional properties of nanoparticles have been studied to gain insight into the fundamental origin of sliding friction. Results: Using molecular dynamics we investigate frictional properties of aluminum and palladium nanoparticles deposited on a graphene layer. We study the time evolution of the total momentum of the system, the total and potential energies, the temperature, the velocity and position of the center of mass, the dimensions of the nanoparticle, and the friction and substrate forces acting on the particle...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765800/surface-characterization-of-nanoparticles-using-near-field-light-scattering
#10
Eunsoo Yoo, Yizhong Liu, Chukwuazam A Nwasike, Sebastian R Freeman, Brian C DiPaolo, Bernardo Cordovez, Amber L Doiron
The effect of nanoparticle surface coating characteristics on colloidal stability in solution is a critical parameter in understanding the potential applications of nanoparticles, especially in biomedicine. Here we explored the modification of the surface of poly(ethylene glycol)-coated superparamagnetic iron oxide nanoparticles (PEG-SPIOs) with the synthetic pseudotannin polygallol via interpolymer complexation (IPC). Changes in particle size and zeta potential were indirectly assessed via differences between PEG-SPIOs and IPC-SPIOs in particle velocity and scattering intensity using near-field light scattering...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765799/a-novel-copper-precursor-for-electron-beam-induced-deposition
#11
Caspar Haverkamp, George Sarau, Mikhail N Polyakov, Ivo Utke, Marcos V Puydinger Dos Santos, Silke Christiansen, Katja Höflich
A fluorine free copper precursor, Cu(tbaoac)2 with the chemical sum formula CuC16 O6 H26 is introduced for focused electron beam induced deposition (FEBID). FEBID with 15 keV and 7 nA results in deposits with an atomic composition of Cu:O:C of approximately 1:1:2. Transmission electron microscopy proved that pure copper nanocrystals with sizes of up to around 15 nm were dispersed inside the carbonaceous matrix. Raman investigations revealed a high degree of amorphization of the carbonaceous matrix and showed hints for partial copper oxidation taking place selectively on the surfaces of the deposits...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765798/heterostuctures-of-4-chloromethyl-phenyltrichlorosilane-and-5-10-15-20-tetra-4-pyridyl-21-h-23-h-porphine-prepared-on-si-111-using-particle-lithography-nanoscale-characterization-of-the-main-steps-of-nanopatterning
#12
Phillip C Chambers, Jayne C Garno
Nanostructures of 4-(chloromethyl)phenyltrichlorosilane (CMPS) were used as a foundation to attach and grow heterostructures of porphyrins and organosilanes. A protocol was developed with particle lithography using steps of immersion in organosilane solutions to selectively passivate the surface of Si(111) with octadecyltrichlorosilane (OTS). A methyl-terminated matrix was chosen to direct the growth of CMPS nanostructures to fill the uncovered sites of Si(111) to enable spatial confinement of the surface reaction...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765797/electrodeposition-of-reduced-graphene-oxide-with-chitosan-based-on-the-coordination-deposition-method
#13
Mingyang Liu, Yanjun Chen, Chaoran Qin, Zheng Zhang, Shuai Ma, Xiuru Cai, Xueqian Li, Yifeng Wang
The electrodeposition of graphene has drawn considerable attention due to its appealing applications for sensors, supercapacitors and lithium-ion batteries. However, there are still some limitations in the current electrodeposition methods for graphene. Here, we present a novel electrodeposition method for the direct deposition of reduced graphene oxide (rGO) with chitosan. In this method, a 2-hydroxypropyltrimethylammonium chloride-based chitosan-modified rGO material was prepared. This material disperses homogenously in the chitosan solution, forming a deposition solution with good dispersion stability...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765796/circular-dichroism-of-chiral-majorana-states
#14
Javier Osca, Llorenç Serra
Background: Majorana states in condensed matter devices may be of a localized nature, such as in hybrid semiconductor/superconductor nanowires, or chirally propagating along the edges such as in hybrid 2D quantum-anomalous Hall/superconductor structures. Results: We calculate the circular dichroism due to chiral Majorana states in a hybrid structure made of a quantum-anomalous Hall insulator and a superconductor. The optical absorption of chiral Majorana states is characterized by equally spaced absorption peaks of both positive and negative dichroism...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29765795/inverse-proximity-effect-in-semiconductor-majorana-nanowires
#15
Alexander A Kopasov, Ivan M Khaymovich, Alexander S Mel'nikov
We study the influence of the inverse proximity effect on the superconductivity nucleation in hybrid structures consisting of semiconducting nanowires placed in contact with a thin superconducting film and discuss the resulting restrictions on the operation of Majorana-based devices. A strong paramagnetic effect for electrons entering the semiconductor together with spin-orbit coupling and van Hove singularities in the electronic density of states in the wire are responsible for the suppression of superconducting correlations in the low-field domain and for the reentrant superconductivity at high magnetic fields in the topologically nontrivial regime...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29719767/understanding-the-performance-and-mechanism-of-mg-containing-oxides-as-support-catalysts-in-the-thermal-dry-reforming-of-methane
#16
REVIEW
Nor Fazila Khairudin, Mohd Farid Fahmi Sukri, Mehrnoush Khavarian, Abdul Rahman Mohamed
Dry reforming of methane (DRM) is one of the more promising methods for syngas (synthetic gas) production and co-utilization of methane and carbon dioxide, which are the main greenhouse gases. Magnesium is commonly applied in a Ni-based catalyst in DRM to improve catalyst performance and inhibit carbon deposition. The aim of this review is to gain better insight into recent developments on the use of Mg as a support or promoter for DRM catalysts. Its high basicity and high thermal stability make Mg suitable for introduction into the highly endothermic reaction of DRM...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29719766/thermoelectric-current-in-topological-insulator-nanowires-with-impurities
#17
Sigurdur I Erlingsson, Jens H Bardarson, Andrei Manolescu
In this paper we consider charge current generated by maintaining a temperature difference over a nanowire at zero voltage bias. For topological insulator nanowires in a perpendicular magnetic field the current can change sign as the temperature of one end is increased. Here we study how this thermoelectric current sign reversal depends on the magnetic field and how impurities affect the size of the thermoelectric current. We consider both scalar and magnetic impurities and show that their influence on the current are quite similar, although the magnetic impurities seem to be more effective in reducing the effect...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29719765/electrostatic-force-spectroscopy-revealing-the-degree-of-reduction-of-individual-graphene-oxide-sheets
#18
Yue Shen, Ying Wang, Yuan Zhou, Chunxi Hai, Jun Hu, Yi Zhang
Electrostatic force spectroscopy (EFS) is a method for monitoring the electrostatic force microscopy (EFM) phase with high resolution as a function of the electrical direct current bias applied either to the probe or sample. Based on the dielectric constant difference of graphene oxide (GO) sheets (reduced using various methods), EFS can be used to characterize the degree of reduction of uniformly reduced one-atom-thick GO sheets at the nanoscale. In this paper, using thermally or chemically reduced individual GO sheets on mica substrates as examples, we characterize their degree of reduction at the nanoscale using EFS...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29719764/semi-automatic-spray-pyrolysis-deposition-of-thin-transparent-titania-films-as-blocking-layers-for-dye-sensitized-and-perovskite-solar-cells
#19
Hana Krýsová, Josef Krýsa, Ladislav Kavan
For proper function of the negative electrode of dye-sensitized and perovskite solar cells, the deposition of a nonporous blocking film is required on the surface of F-doped SnO2 (FTO) glass substrates. Such a blocking film can minimise undesirable parasitic processes, for example, the back reaction of photoinjected electrons with the oxidized form of the redox mediator or with the hole-transporting medium can be avoided. In the present work, thin, transparent, blocking TiO2 films are prepared by semi-automatic spray pyrolysis of precursors consisting of titanium diisopropoxide bis(acetylacetonate) as the main component...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29719763/field-controlled-ultrafast-magnetization-dynamics-in-two-dimensional-nanoscale-ferromagnetic-antidot-arrays
#20
Anulekha De, Sucheta Mondal, Sourav Sahoo, Saswati Barman, Yoshichika Otani, Rajib Kumar Mitra, Anjan Barman
Ferromagnetic antidot arrays have emerged as a system of tremendous interest due to their interesting spin configuration and dynamics as well as their potential applications in magnetic storage, memory, logic, communications and sensing devices. Here, we report experimental and numerical investigation of ultrafast magnetization dynamics in a new type of antidot lattice in the form of triangular-shaped Ni80 Fe20 antidots arranged in a hexagonal array. Time-resolved magneto-optical Kerr effect and micromagnetic simulations have been exploited to study the magnetization precession and spin-wave modes of the antidot lattice with varying lattice constant and in-plane orientation of the bias-magnetic field...
2018: Beilstein Journal of Nanotechnology
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