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Nanoscale Research Letters

Meng Jiang, Yun Qi, Huan Liu, Yinguang Chen
Nanomaterials and nanotechnologies (NNs) have been shaping the wastewater treatment process unprecedentedly. Bibliometric methods are regarded as an indispensable light to guide direction in scientific domain. The present study aims to investigate the role of NNs in wastewater treatment with bibliometric techniques based on SCI databases from 1997 to 2016. Results showed that China (962), USA (324) and Iran (140) are the most productive countries. Chinese Academy of Sciences (149), Tongji University (49), and Harbin Institute of Technology (40) from China are the most contributive institutions...
August 10, 2018: Nanoscale Research Letters
Khwaja Salahuddin Siddiqi, Azamal Husen, Sayed Sartaj Sohrab, Mensur Osman Yassin
Nanomaterials (NMs) are receiving remarkable attention due to their unique properties and structure. They vary from atoms and molecules along with those of bulk materials. They can be engineered to act as drug delivery vehicles to cross blood-brain barriers (BBBs) and utilized with better efficacy and safety to deliver specific molecules into targeted cells as compared to conventional system for neurological disorders. Depending on their properties, various metal chelators, gold nanoparticles (NPs), micelles, quantum dots, polymeric NPs, liposomes, solid lipid NPs, microparticles, carbon nanotubes, and fullerenes have been utilized for various purposes including the improvement of drug delivery system, treatment response assessment, diagnosis at early stage, and management of neurological disorder by using neuro-engineering...
August 10, 2018: Nanoscale Research Letters
Yuwei Wang, Hong Liu, Wenzhong Shen
Hydrogenated nanocrystalline silicon (nc-Si:H) thin film has received a great deal of attention as a promising material for flat panel display transistors, solar cells, etc. However, the multiphase structure of nc-Si:H leads to many defects. One of the major challenges is how to reduce the defects conveniently. In this work, we developed a simple and effective method to deposit low-defect-density nc-Si:H thin film. This method is simply by tuning the deposition pressure in a high-pressure range in plasma-enhanced chemical vapor deposition (PECVD) process...
August 10, 2018: Nanoscale Research Letters
Hogyoung Kim, Hee Ju Yoon, Byung Joon Choi
The interfacial and electrical properties of atomic layer deposited AlN on n-GaN with different AlN thicknesses were investigated. According to capacitance-voltage (C-V) characteristics, the sample with a 7.4-nm-thick AlN showed the highest interface and oxide trap densities. When the AlN thickness was 0.7 nm, X-ray photoelectron spectroscopy (XPS) spectra showed the dominant peak associated with Al-O bonds, along with no clear AlN peak. The amount of remained oxygen atoms near the GaN surface was found to decrease for the thicker AlN...
August 10, 2018: Nanoscale Research Letters
Edgar Franco, Rosmery Dussán, Maribel Amú, Diana Navia
Polymeric nanofibers are widely studied in the textile industry since with them, it is possible to get a great variety of functionalities. In this paper, polyamide 6/66 (PA 6/66) solutions at different concentrations (12, 17, and 22% wt.) were made, to get nanofibers through the basic electrospinning process which were characterized by scanning electron microscope (SEM) and productivity. Afterwards, nanofiber bundles were produced using the electrospinning sol-gel process, which were characterized by SEM and tensile test...
August 8, 2018: Nanoscale Research Letters
K Pradeev Raj, K Sadaiyandi, A Kennedy, Suresh Sagadevan, Zaira Zaman Chowdhury, Mohd Rafie Bin Johan, Fauziah Abdul Aziz, Rahman F Rafique, R Thamiz Selvi, R Rathina Bala
In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0-7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30-110 nm...
August 3, 2018: Nanoscale Research Letters
Jongjin Lee, Jaemin Kong
Cross-sectional potential distribution of high open-circuit voltage bulk heterojunction photovoltaic device was measured using Kelvin probe force microscopy. Potential drop confined at cathode interface implies that photo-active layer is an effective p-type semiconductor. Potential values in field-free region show wide variation according to log-normal distribution. This potential dip prone to have holes captured during the diffusive motion, which can increase bimolecular recombination, while potential gradient in depletion region makes this potential dip smaller and the captured holes easily escape from dip region by Schottky barrier lowering...
August 1, 2018: Nanoscale Research Letters
Jiann-Lin Chen, Yiin-Kuen Fuh, Chun-Lin Chu
During the formation of Ge fin structures on a silicon-on-insulator (SOI) substrate, we found that the dry etching process must be carefully controlled. Otherwise, it may lead to Ge over-etching or the formation of an undesirable Ge fin profile. If the etching process is not well controlled, the top Ge/SOI structure is etched away, and only the Si fin layer remains. In this case, the device exhibits abnormal characteristics. The etching process is emerging as a critical step in device scaling and packaging and affects attempts to increase the packing density and improve device performance...
July 31, 2018: Nanoscale Research Letters
Wei Wei, Xin Yan, Bing Shen, Jian Qin, Xia Zhang
A hybrid channel plasmon nanowire laser based on GaAs/AlGaAs core-shell semiconductor nanowire and silver V-groove is proposed. The laser structure has potential capability of integrating with plasmonic waveguides, using channel plasmon-polariton modes in V-groove plasmonic waveguides. Guiding and lasing properties are numerically calculated using finite elements method. From the theoretical results, the laser could support guiding mode with a smallest diameter of 40 nm. Lasing emission could happen at a relatively low threshold around 2000 cm- 1 when the diameter is larger than 140 nm...
July 31, 2018: Nanoscale Research Letters
Hiroyuki Kurosawa, Bongseok Choi, Masanobu Iwanaga
This study focuses on the experimental and numerical investigations for the degradation characteristics of a metasurface polarizer. The metasurface has a stacked complementary structure that exhibits a high extinction ratio of the order of 10,000 in the near-infrared region. However, its performance has significantly degraded over time. To clarify the origin of this degradation, the effects of surface roughness and metallic loss are investigated numerically. The degradation is mainly attributed to increase in the loss...
July 31, 2018: Nanoscale Research Letters
Shiwei Shi, Peihong Wang, Jingbiao Cui, Zhaoqi Sun
Al-doped ZnO nanospears were prepared by a hydrothermal method. The crystalline structure and photoluminescence properties of ZnO nanospears were characterized for investigating the effect of Al doping on the properties of ZnO nanospears. ZnO nanospears grow preferentially along the c-axis and have a fine tip. Al doping reduces the length of ZnO nanospears. In room temperature, photoluminescence spectra of Al-doped ZnO nanospears, a near band edge emission (~3.16 eV), and a violet emission (~2.91 eV) exhibit a strong doping-dependent characteristic and a temperature-independent characteristic, while deep level emission peak shows a temperature-dependent characteristic...
July 25, 2018: Nanoscale Research Letters
Raisa Labyntsevа, Viktoriia Yavorovska, Olexander Bevza, Andriy Drapaylo, Vitaly Kalchenko, Sergiy Kosterin
Numerous female reproductive abnormalities are caused by uterine smooth muscle (myometrium) disorders. Heavy metals have an adverse effect on the contractility of the uterine smooth muscle. Although zinc is an essential biogenic element for most of the organisms, high doses of this element are toxic. The study of 0.5-5 mM Zn2+ effect on myosin S1 ATPase activity from the uterus found that 5 mM Zn2+ cations have the most pronounced inhibitory effect. The calculation of the kinetic parameters (Km and Vmax , ATP ) revealed that the apparent maximum velocity of the hydrolysis ATP catalyzed by myosin in the presence of 5 mM Zn2+ decreased by 1...
July 25, 2018: Nanoscale Research Letters
Qing Zhang, Huarui Fu, Caiyin You, Li Ma, Na Tian
The perpendicular magnetic anisotropy (PMA) has been achieved in Ta/Pd/CoFeMnSi (CFMS)/MgO/Pd film, in which the Heusler compound CoFeMnSi is one of the most promising candidates for spin gapless semiconductor (SGS). The strong PMA, with the effective anisotropy constant Keff of 5.6 × 105 erg/cm3 (5.6 × 104  J/m3 ), can be observed in the Ta/Pd/CFMS (2.3 nm)/MgO (1.3 nm)/Pd films annealed at 300 °C. In addition, it was found that the magnetic properties of Ta/Pd/CFMS/MgO/Pd films are sensitive to hydrogen (H2 ) under a weak magnetic field (< 30 Oe), whose residual magnetization (Mr ) decreased from 123...
July 25, 2018: Nanoscale Research Letters
Ji-Won Oh, Hyunwoong Na, Yong Soo Cho, Hanshin Choi
We synthesize, in situ, W-x wt% Cu (x = 5, 10, and 20 wt%) composite nanoparticles using inductively coupled radio-frequency (RF) thermal plasma. In the RF thermal plasma process, the W-x wt% Cu composite nanoparticles are synthesized by hydrogen reduction of tungsten trioxide (WO3 ) and cupric oxide (CuO). The synthesized W and Cu nanoparticles are effectively reduced to W and Cu, and the W-Cu nanoparticles are uniformly distributed bimetallic (or composite) nanoparticles.
July 24, 2018: Nanoscale Research Letters
Shiyu Zhang, Chao Zhang, Mingyue Liu, Renliang Huang, Rongxin Su, Wei Qi, Zhimin He
Nanoscale zero-valent iron (nZVI) has shown considerable promise in the treatment of chlorinated organic compounds, but rapid aggregation and inactivation hinder its application. In this study, palladium-doped zero-valent iron nanoparticles involving poly (γ-glutamic acid) (Fe-Pd@PGA NPs) were synthesized. The nanoparticles were small (~100 nm), uniformly distributed, and highly stable. The dechlorination performance of Fe-Pd@PGA NPs was evaluated using p-CP as a model. The results demonstrated that Fe-Pd@PGA NPs show high activity even in weakly alkaline conditions...
July 24, 2018: Nanoscale Research Letters
Yulong Liao, Peng Deng, Xiaoyi Wang, Dainan Zhang, Faming Li, Qinghui Yang, Huaiwu Zhang, Zhiyong Zhong
Based on highly ordered TiO2 nanotube arrays (NTAs), we successfully fabricated the Cu2 O-TiO2 NTA heterojunction by a simple thermal decomposition process for the first time. The anodic TiO2 NTAs were functioned as both "nano-container" and "nano-reactors" to load and synthesize the narrow band Cu2 O nanoparticles. The loaded Cu2 O expanded absorption spectrum of the TiO2 NTAs from ultraviolent range to visible light range. We found that the Cu2 O-TiO2 NTA heterojunction films had visible activity towards photocatalytic degrading methyl orange (MO)...
July 24, 2018: Nanoscale Research Letters
Jun-Hong Lin
The thermally reduced graphene oxide (TRG) composites with various interlayer distances were synthesized. These TRG sheets are intercalated with anionic surfactant sodium dodecyl sulfate (SDS) to prevent the restacking between TRG sheets. A facile approach is employed to enlarge the interlayer distance between the TRG sheets by the Coulomb force interaction between the intercalated surfactants and the ionic liquids. A systematic investigation of the morphology and the electrical performances of these EDLC cells was carried out...
July 20, 2018: Nanoscale Research Letters
Fumin Li, Mengqi Xu, Xingping Ma, Liang Shen, Liangxin Zhu, Yujuan Weng, Gentian Yue, Furui Tan, Chong Chen
We report a new method as UV treatment of low-temperature processed to obtain tin oxide (SnO2 ) electron transport layers (ETLs). The results show that the high quality of ETLs can be produced by controlling the thickness of the film while it is treated by UV. The thickness is dependent on the concentration of SnO2 . Moreover, the conductivity and transmittance of the layer are dependent on the quality of the film. A planar perovskite solar cell is prepared based on this UV-treated film. The temperatures involved in the preparation process are less than 90 °C...
July 20, 2018: Nanoscale Research Letters
Yang Li, Wen-Jing Yue, Zhen-Xiang Chen, Bing-Qiang Cao, Xiao-Qian Fu, Chun-Wei Zhang, Zhi-Ming Li
We present a highly efficient structural color filtering approach for large-area application, using a nanoporous anodic alumina (NAA) film overlaid with an aluminum (Al) layer on top of an optically thick Al substrate. The NAA film, consisting of a self-assembled nanopore array in a hexagonal lattice, is equivalent to a quasi-homogeneous medium according to effective medium theory. The proposed structure enables strong absorption at resonance owing to the Fabry-Perot resonance supported by the metal-dielectric-metal configuration and the plasmonic effect mediated by the top nanoporous Al layer...
July 20, 2018: Nanoscale Research Letters
Xuelian Yan, Yucen Yao, Yuan Chen
High-performance electrocatalysts for the oxygen reduction reaction (ORR) are essential in electrochemical energy storage and conversion technologies. Fe-N-C electrocatalysts have been developed as one of the most promising alternatives to precious metal materials. Current M-N-C electrocatalysts usually are derived from high-temperature thermal treatment of a nitrogen-containing polymer or metal-organic frameworks (MOFs). Here, we developed Fe-N-C mesoporous nanofibers with low-cost urea and FeCl3 as the nitride and iron source; the electrocatalysts with abundant Fe-Nx active sites and large surface area were synthesized via electrospinning, in situ pyrolysis, and acid treatment process...
July 20, 2018: Nanoscale Research Letters
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