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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/28431465/photovoltaic-properties-and-ultrafast-plasmon-relaxation-dynamics-of-diamond-like-carbon-nanocomposite-films-with-embedded-ag-nanoparticles
#1
Šarūnas Meškinis, Domantas Peckus, Andrius Vasiliauskas, Arvydas Čiegis, Rimantas Gudaitis, Tomas Tamulevičius, Iryna Yaremchuk, Sigitas Tamulevičius
Ultrafast relaxation dynamics of diamond-like carbon (DLC) films with embedded Ag nanoparticles (DLC:Ag) and photovoltaic properties of heterojunctions consisting of DLC:Ag and crystalline silicon (DLC:Ag/Si) were investigated by means of transient absorption (TAS) spectroscopy and photovoltaic measurements. The heterojunctions using both p type and n type silicon were studied. It was found that TAS spectra of DLC:Ag films were dependent on the used excitation wavelength. At wavelengths where Ag nanoparticles absorbed light most intensively, only DLC signal was registered...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431464/effect-of-thermomagnetic-treatment-on-structure-and-properties-of-cu-al-mn-alloy
#2
A N Titenko, L D Demchenko, A O Perekos, O Yu Gerasimov
The paper studies the influence of magnetic field on magnetic and mechanical properties of Cu-Mn-Al alloy under annealing. The comparative analysis of the magnetic field orientation impact on solid solution decomposition processes in a fixed annealing procedure is held using the methods of low-field magnetic susceptibility, specific magnetization, and microhardness test. The paper highlights changes in the magnetic and mechanical properties of Cu-Al-Mn alloy as the result of change in a critical size of forming precipitated ferromagnetic phase and determines correlation in the behavior of magnetic and mechanical properties of the alloy, depending on a critical nucleus size of forming precipitated ferromagnetic phase...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431463/enhanced-ferromagnetic-interaction-in-modulation-doped-gamnn-nanorods
#3
Yuan-Ting Lin, Paritosh Vilas Wadekar, Hsiang-Shun Kao, Yu-Jung Zheng, Quark Yung-Sung Chen, Hui-Chun Huang, Cheng-Maw Cheng, New-Jin Ho, Li-Wei Tu
In this report, ferromagnetic interactions in modulation-doped GaMnN nanorods grown on Si (111) substrate by plasma-assisted molecular beam epitaxy are investigated with the prospect of achieving a room temperature ferromagnetic semiconductor. Our results indicate the thickness of GaN layer in each GaN/MnN pair, as well as Mn-doping levels, are essential for suppressing secondary phases as well as enhancing the magnetic moment. For these optimized samples, structural analysis by high-resolution X-ray diffractometry and Raman spectroscopy verifies single-crystalline modulation-doped GaMnN nanorods with Ga sites substituted by Mn atoms...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431462/direct-magnetic-relief-recording-using-as40s60-mn-se-nanocomposite-multilayer-structures
#4
A Stronski, E Achimova, O Paiuk, A Meshalkin, A Prisacar, G Triduh, P Oleksenko, P Lytvyn
Processes of holographic recording of surface relief structures using As2S3:Mn-Se multilayer nanostructures as registering media were studied in this paper. Optical properties of As2S3:Mn, Se layers, and As2S3:Mn-Se multilayer nanostructures were investigated. Values of optical bandgaps were obtained from Tauc dependencies. Surface relief diffraction gratings were recorded. Direct one-stage formation of surface relief using multilayer nanostructures is considered. For the first time, possibility of direct formation of magnetic relief simultaneous with surface relief formation under optical recording using As2S3:Mn-Se multilayer nanostructures is shown...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431461/impact-of-superparamagnetic-iron-oxide-nanoparticles-on-vocal-fold-fibroblasts-cell-behavior-and-cellular-iron-kinetics
#5
Marina Pöttler, Anna Fliedner, Eveline Schreiber, Christina Janko, Ralf Philipp Friedrich, Christopher Bohr, Michael Döllinger, Christoph Alexiou, Stephan Dürr
PURPOSE: The voice is the most important instrument of communication. Tissue defects in the vocal fold (VF) area lead to serious reduction in quality of life, but thus far, no satisfactory VF implant exists. Therefore, we aim to establish a functional VF implant in a rabbit model by magnetic tissue engineering (MTE) using superparamagnetic iron oxide nanoparticles (SPION). Hence, iron quantification over time as well as cell behavior studies upon SPION treatment are of great importance...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431460/paramagnetic-intrinsic-defects-in-polycrystalline-large-area-2d-mos2-films-grown-on-sio2-by-mo-sulfurization
#6
A Stesmans, S Iacovo, D Chiappe, I Radu, C Huyghebaert, S De Gendt, V V Afanas'ev
A low-temperature electron spin resonance study has been carried out on large-area high-purity polycrystalline two-dimensional few monolayer (ML) 2H MoS2 films synthesized by sulfurization of Mo layers, with intent to atomically assess mobility-degrading detrimental point defects. This reveals the presence of a distinct previously unreported anisotropic defect of axial symmetry about the c-axis characterized by g // = 2.00145 and g ⊥ = 2.0027, with corresponding density (spin S = ½) ~3 × 10(12) cm(-2) for a 4 ML thick film...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431459/direct-growth-of-al2o3-on-black-phosphorus-by-plasma-enhanced-atomic-layer-deposition
#7
B B Wu, H M Zheng, Y Q Ding, W J Liu, H L Lu, P Zhou, L Chen, Q Q Sun, S J Ding, David W Zhang
Growing high-quality and uniform dielectric on black phosphorus is challenging since it is easy to react with O2 or H2O in ambient. In this work, we have directly grown Al2O3 on BP using plasma-enhanced atomic layer deposition (PEALD). The surface roughness of BP with covered Al2O3 film can reduce significantly, which is due to the removal of oxidized bubble in BP surface by oxygen plasma. It was also found there is an interfacial layer of PO x in between amorphous Al2O3 film and crystallized BP, which is verified by both X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) measurements...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28423867/high-efficiency-low-power-consumption-dfb-quantum-cascade-lasers-without-lateral-regrowth
#8
Zhi-Wei Jia, Li-Jun Wang, Jin-Chuan Zhang, Feng-Qi Liu, Yu-Hong Zhou, Dong-Bo Wang, Xue-Feng Jia, Ning Zhuo, Jun-Qi Liu, Shen-Qiang Zhai, Zhan-Guo Wang
Very low power-consumption distributed feedback (DFB) quantum cascade lasers (QCLs) at the wavelength around 4.9 μm were fabricated by conventional process without lateral regrowth of InP:Fe or using sidewall grating. Benefitted from the optimized materials and low waveguide loss, very low threshold current density of 0.5 kA/cm(2) was obtained for a device with cavity length of 2 mm. Combined with the partial-high-reflection coating, the 1-mm-long DFB QCL achieved low power-consumption continuous wave (CW) operation up to 105 °C...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28423866/relaxation-behavior-of-polyethylene-welded-joints
#9
Valeriy Demchenko, Maksym Iurzhenko, Andriy Shadrin, Anatoliy Galchun
The paper presents results of the investigation of structure relaxation and thermal properties of PE-80 and PE-100 polyethylene hot-tool butt welds. It was found that a weld with the re-crystallized crystalline structure is formed during the welding of dissimilar types of polyethylene. It is shown that within a long period (1 year) the relaxation occurs not only in amorphous but also in the crystalline phase (crystalline α-form transforms into mixed αβ-form), with respective changes in polyethylene properties...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28423865/peald-grown-crystalline-aln-films-on-si-100-with-sharp-interface-and-good-uniformity
#10
Sanjie Liu, Mingzeng Peng, Caixia Hou, Yingfeng He, Meiling Li, Xinhe Zheng
Aluminum nitride (AlN) thin films were deposited on Si (100) substrates by using plasma-enhanced atomic layer deposition method (PEALD). Optimal PEALD parameters for AlN deposition were investigated. Under saturated deposition conditions, the clearly resolved fringes are observed from X-ray reflectivity (XRR) measurements, showing the perfectly smooth interface between the AlN film and Si (100). It is consistent with high-resolution image of the sharp interface analyzed by transmission electron microscope (TEM)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28423864/adsorption-of-uranyl-ions-at-the-nano-hydroxyapatite-and-its-modification
#11
Ewa Skwarek, Agnieszka Gładysz-Płaska, Yuliia Bolbukh
Nano-hydroxyapatite and its modification, hydroxyapatite with the excess of phosphorus (P-HAP) and hydroxyapatite with the carbon ions built into the structure (C-HAP), were prepared by the wet method. They were studied by means of XRD, accelerated surface area and porosimetry (ASAP), and SEM. The size of crystallites computed using the Scherrer method was nano-hydroxyapatite (HAP) = 20 nm; P-HAP-impossible to determine; C-HAP = 22 nm; nano-HAP/U(VI) = 13.7 nm; P-HAP/U(VI)-impossible to determine, C-HAP/U(VI) = 11 nm...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28420226/determination-of-magnetic-parameters-of-maghemite-%C3%AE-fe2o3-core-shell-nanoparticles-from-nonlinear-magnetic-susceptibility-measurements
#12
Ihor I Syvorotka, Lyubomyr P Pavlyk, Sergii B Ubizskii, Oleg A Buryy, Hrygoriy V Savytskyy, Nataliya Y Mitina, Oleksandr S Zaichenko
Method of determining of magnetic moment and size from measurements of dependence of the nonlinear magnetic susceptibility upon magnetic field is proposed, substantiated and tested for superparamagnetic nanoparticles (SPNP) of the "magnetic core-polymer shell" type which are widely used in biomedical technologies. The model of the induction response of the SPNP ensemble on the combined action of the magnetic harmonic excitation field and permanent bias field is built, and the analysis of possible ways to determine the magnetic moment and size of the nanoparticles as well as the parameters of the distribution of these variables is performed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28420225/engineering-the-complex-valued-constitutive-parameters-of-metamaterials-for-perfect-absorption
#13
Pengwei Wang, Naibo Chen, Chaojun Tang, Jing Chen, Fanxin Liu, Saiqian Sheng, Bo Yan, Chenghua Sui
We theoretically studied how to directly engineer the constitutive parameters of metamaterials for perfect absorbers of electromagnetic waves. As an example, we numerically investigated the necessary refractive index n and extinction coefficient k and the relative permittivity ε and permeability μ of a metamaterial anti-reflection layer, which could cancel the reflection from a hydrogenated amorphous silicon (α-Si:H) thin film on a metal substrate, within the visible wavelength range from 300 to 800 nm...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410556/electronic-structure-and-charge-trapping-characteristics-of-the-al2o3-tialo-sio2-gate-stack-for-nonvolatile-memory-applications
#14
Wenchao Xu, Yang Zhang, Zhenjie Tang, Zhengjie Shao, Guofu Zhou, Minghui Qin, Min Zeng, Sujuan Wu, Zhang Zhang, Jinwei Gao, Xubing Lu, Junming Liu
In this work, high-k composite TiAlO film has been investigated as charge-trapping material for nonvolatile memory applications. The annealing formed Al2O3-TiAlO-SiO2 dielectric stack demonstrates significant memory effects and excellent reliability properties. The memory device exhibits a large memory window of ~2.6 V under ±8 V sweeping voltage, and it shows only ~14% charge loss after more than 10 years' retention, indicating excellent charge retention properties. The electronic structures of the Al2O3-TiAlO-SiO2 have been studied by X-ray photoelectron spectroscopy measurements, and it reveals that the quantum well and the defect traps in TiAlO film can provide a >1...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410555/microwave-properties-of-one-dimensional-photonic-structures-based-on-composite-layers-filled-with-nanocarbon
#15
Ludmila Vovchenko, Oleg Lozitsky, Igor Sagalianov, Ludmila Matzui, Vilen Launets
This work presents the results of computer modeling and experimental measurements of microwave transmission properties for one-dimensional periodic multi-layered photonic structures (PCs), composed of epoxy layers and composite layers filled with nanocarbon particles-multi-walled carbon nanotubes and graphite nanoplatelets. The results show that the characteristics of observed photonic band gaps in transmission spectra of PC can be controlled by varying the parameters of layers, namely, the complex permittivity and the layer thickness...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410554/yolk-cage-shell-hollow-mesoporous-monodispersion-nanospheres-of-amorphous-calcium-phosphate-for-drug-delivery-with-high-loading-capacity
#16
Suping Huang, Chunxia Li, Qi Xiao
In this paper, yolk-shell hollow nanospheres of amorphous calcium phosphate (ACP) are prepared, and its loading capacity is investigated by comparing with that of solid-shell hollow structure ACP and cage-shell hollow structure ACP. Results show that the products are yolk @ cage-shell of ACP with large shell's pores size (15-40 nm) and large cavity volume. Adsorption results show that the loading capacity of yolk @ cage-shell hollow spherical ACP is very high, which is more than twice that of hollow ACP and 1...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410553/effects-of-photochromic-furan-based-diarylethenes-on-gold-nanoparticles-aggregation
#17
Alina Khodko, Nataliya Kachalova, Sergiy Scherbakov, Anna Eremenko, Iuliia Mukha
The photochromic properties of furan-based diarylethenes and their interaction with citrate-capped gold nanoparticles were investigated by ultraviolet/visible absorption spectroscopy and transmission electron microscopy. We identified the optimal concentration of diarylethenes in water-ethanol mixture required for stability of colloidal systems. Nanoparticles coupled with diarylethene derivatives exhibit a new surface plasmon resonance band coming from their aggregation. We analyzed the effects of functional side-chain groups on aggregation process...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410552/a-novel-solubility-enhanced-rubusoside-based-micelles-for-increased-cancer-therapy
#18
Meiying Zhang, Tongcheng Dai, Nianping Feng
Many anti-cancer drugs have a common problem of poor solubility. Increasing the solubility of the drugs is very important for its clinical applications. In the present study, we revealed that the solubility of insoluble drugs was significantly enhanced by adding rubusoside (RUB). Further, it was demonstrated that RUB could form micelles, which was well characterized by Langmuir monolayer investigation, transmission electron microscopy, atomic-force microscopy, and cryogenic transmission electron microscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410551/the-computational-studies-of-plasmon-interaction
#19
Antonina Demchuk, Ivan Bolesta, Oleksii Kushnir, Ihor Kolych
In this paper, an interaction of metal nanoparticles that appears in the extinction spectra was investigated. The mutual coupling between the nanoparticles, the effect of size difference, and the interparticle separation in silver nanoparticle dimers are studied by computer discrete dipole approximation methods. The obtained results show that nanoparticle interaction results in the distinct collective modes, known as the low-energy bonding modes and the higher-energy antibounding modes. The spectral position of the modes is analyzed as a function of the ratio of interparticle distance to particle size that reduces the dependency on the particle size itself...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28410550/electrical-and-photoelectrical-properties-of-reduced-graphene-oxide-porous-silicon-nanostructures
#20
Igor B Olenych, Olena I Aksimentyeva, Liubomyr S Monastyrskii, Yulia Yu Horbenko, Maryan V Partyka
In this work, the hybrid structures were created by electrochemical etching of silicon wafer and deposition of reduced graphene oxide (RGO) on the porous silicon (PS) layer. With the help of SEM and AFM, the formation of hybrid PS-RGO structure was confirmed. By means of current-voltage characteristic analysis and impedance spectroscopy, we studied electrical characteristics of PS-RGO structures. The formation of photosensitive electrical barriers in hybrid structures was revealed. Temporal parameters and spectral characteristics of photoresponse in the 400-1100-nm wavelength range were investigated...
December 2017: Nanoscale Research Letters
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