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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/29236194/synergetic-effect-of-dy2o3-and-ca-co-dopants-towards-enhanced-coercivity-of-rare-earth-abundant-re-fe-b-magnets
#1
Yingfei Li, Na Tian, Xiaodong Fan, Caiyin You, Wenli Pei, Zhenxiang Cheng
Low coercivity is the main disadvantage of RE-Fe-B permanent magnets containing highly abundant rare earths (RE: La, Ce) from the application point of view, even though they exhibit many cost and resource advantages. In this work, an industrial mixed rare earth alloy (RE100 = La30.6Ce50.2Pr6.4Nd12.8) with a high amount of the more abundant elements was adopted to fabricate RE-Fe-B permanent magnets by means of mechanical alloying accompanied by post-annealing. A synergetic effect towards enhancing the coercivity was observed after co-doping with Dy2O3 and Ca, with the coercivity increasing from 2...
December 13, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29236184/hybrid-uv-ozone-treated-rgo-pedot-pss-as-an-efficient-hole-transport-material-in-inverted-planar-perovskite-solar-cells
#2
Shuying Wang, Xiaona Huang, Haoxuan Sun, Chunyang Wu
Inverted planar perovskite solar cells (PSCs), which are regarded as promising devices for new generation of photovoltaic systems, show many advantages, such as low-temperature film formation, low-cost fabrication, and smaller hysteresis compared with those of traditional n-i-p PSCs. As an important carrier transport layer in PSCs, the hole transport layer (HTL) considerably affects the device performance. Therefore, HTL modification becomes one of the most critical issues in improving the performance of PSCs...
December 13, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29236182/effect-of-engineered-nanoparticles-on-exopolymeric-substances-release-from-marine-phytoplankton
#3
Meng-Hsuen Chiu, Zafir A Khan, Santiago G Garcia, Andre D Le, Agnes Kagiri, Javier Ramos, Shih-Ming Tsai, Hunter W Drobenaire, Peter H Santschi, Antonietta Quigg, Wei-Chun Chin
Engineered nanoparticles (ENPs), products from modern nanotechnologies, can potentially impact the marine environment to pose serious threats to marine ecosystems. However, the cellular responses of marine phytoplankton to ENPs are still not well established. Here, we investigate four different diatom species (Odontella mobiliensis, Skeletonema grethae, Phaeodactylum tricornutum, Thalassiosira pseudonana) and one green algae (Dunaliella tertiolecta) for their extracellular polymeric substances (EPS) release under model ENP treatments: 25 nm titanium dioxide (TiO2), 10-20 nm silicon dioxide (SiO2), and 15-30 nm cerium dioxide (CeO2)...
December 13, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29234906/polyaniline-coated-activated-carbon-aerogel-sulfur-composite-for-high-performance-lithium-sulfur-battery
#4
Zhiwei Tang, Jinglin Jiang, Shaohong Liu, Luyi Chen, Ruliang Liu, Bingna Zheng, Ruowen Fu, Dingcai Wu
An activated carbon aerogel (ACA-500) with high surface area (1765 m2 g-1), pore volume (2.04 cm3 g-1), and hierarchical porous nanonetwork structure is prepared through direct activation of organic aerogel (RC-500) with a low potassium hydroxide ratio (1:1). Based on this substrate, a polyaniline (PANi)-coated activated carbon aerogel/sulfur (ACA-500-S@PANi) composite is prepared via a simple two-step procedure, including melt-infiltration of sublimed sulfur into ACA-500, followed by an in situ polymerization of aniline on the surface of ACA-500-S composite...
December 12, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29214597/fabrication-and-characterization-of-new-composite-tio2-carbon-nanofiber-anodic-catalyst-support-for-direct-methanol-fuel-cell-via-electrospinning-method
#5
N Abdullah, S K Kamarudin, L K Shyuan, N A Karim
Platinum (Pt) is the common catalyst used in a direct methanol fuel cell (DMFC). However, Pt can lead towards catalyst poisoning by carbonaceous species, thus reduces the performance of DMFC. Thus, this study focuses on the fabrication of a new composite TiO2 carbon nanofiber anodic catalyst support for direct methanol fuel cells (DMFCs) via electrospinning technique. The distance between the tip and the collector (DTC) and the flow rate were examined as influencing parameters in the electrospinning technique...
December 6, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29214561/environmental-friendly-and-facile-synthesis-of-co3o4-nanowires-and-their-promising-application-with-graphene-in-lithium-ion-batteries
#6
Zhiqiang Xu, Wei Liu, Yuanyi Yang, Lijuan Sun, Yi Deng, Li Liao
In this work, we developed an eco-friendly strategy for preparing Co3O4 nanowires. The process consisted of two steps: controllable synthesis of metal cobalt nanowires followed by a facile air-oxidization step. The 1D nanowire structure with a high aspect ratio was easily achieved via a magnetic-field-assisted self-assembly of cobalt ion complexes during reduction. After air-calcinations, the Co3O4 nanowires were prepared in large scale and ready to be used as the anode material for lithium-ion batteries. The Co3O4 nanowires, which possessed a length ranging from 3 to 8 μm with the aspect ratio more than 15, exhibited a reversible lithium storage capacity up to ~ 790 mAh/g when using a small amount of defect-free graphene flakes as conductive additives...
December 6, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29214502/highly-efficient-inverted-perovskite-solar-cells-with-cdse-qds-lif-electron-transporting-layer
#7
Furui Tan, Weizhe Xu, Xiaodong Hu, Ping Yu, Weifeng Zhang
Organic/inorganic hybrid perovskite solar cell has emerged as a very promising candidate for the next generation of near-commercial photovoltaic devices. Here in this work, we focus on the inverted perovskite solar cells and have found that remarkable photovoltaic performance could be obtained when using cadmium selenide (CdSe) quantum dots (QDs) as electron transporting layer (ETL) and lithium fluoride (LiF) as the buffer, with respect to the traditionally applied and high-cost [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)...
December 6, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29214484/designing-neat-and-composite-carbon-nanotube-materials-by-porosimetric-characterization
#8
Kazufumi Kobashi, Howon Yoon, Seisuke Ata, Takeo Yamada, Don N Futaba, Kenji Hata
We propose a porosimetry-based method to characterize pores formed by carbon nanotubes (CNTs) in the CNT agglomerates for designing neat CNT-based materials and composites. CNT agglomerates contain pores between individual CNTs and/or CNT bundles (micropore < 2 nm, mesopores 2-50 nm, and macropores > 50 nm). We investigated these pores structured by CNTs with different diameters and number of walls, clarifying the broader size distribution and the larger volume with increased diameters and number of walls...
December 6, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29204909/nano-se-assimilation-and-action-in-poultry-and-other-monogastric-animals-is-gut-microbiota-an-answer
#9
Peter F Surai, Ivan I Kochish, Oksana A Velichko
Recently, a comprehensive review paper devoted to roles of nano-Se in livestock and fish nutrition has been published in the Nanoscale Research Letters. The authors described in great details an issue related to nano-Se production and its possible applications in animal industry and medicine. However, molecular mechanisms of nano-Se action were not described and the question of how nano-Se is converted into active selenoproteins is not resolved. It seems likely that the gut microbiota can convert nano-Se into selenite, H2Se or Se-phosphate with the following synthesis of selenoproteins...
December 4, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28789485/facile-synthesis-of-silver-nanowires-with-different-aspect-ratios-and-used-as-high-performance-flexible-transparent-electrodes
#10
Qingwen Xue, Weijing Yao, Jun Liu, Qingyong Tian, Li Liu, Mengxiao Li, Qiang Lu, Rui Peng, Wei Wu
Silver nanowires (Ag NWs) are the promising materials to fabricate flexible transparent electrodes, aiming to replace indium tin oxide (ITO) in the next generation of flexible electronics. Herein, a feasible polyvinylpyrrolidone (PVP)-mediated polyol synthesis of Ag NWs with different aspect ratios is demonstrated and high-quality Ag NWs transparent electrodes (NTEs) are fabricated without high-temperature thermal sintering. When employing the mixture of PVP with different average molecular weight as the capping agent, the diameters of Ag NWs can be tailored and Ag NWs with different aspect ratios varying from ca...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28789483/temperature-dependent-crystallization-of-mos2-nanoflakes-on-graphene-nanosheets-for-electrocatalysis
#11
Xiaoru Guo, Yang Hou, Ren Ren, Junhong Chen
This work primarily studies the crystallization condition of molybdenum disulfide (MoS2) in MoS2/graphene hybrids by a temperature-varying hydrothermal method from 150 to 240 °C. Flower-like MoS2 nanoflakes were successfully grown on graphene nanosheets and characterized to understand the temperature-dependent crystallization process and the electrochemical performance. The highest electrocatalytic efficiency for both the dye-sensitized solar cell and the hydrogen evolution reaction was obtained by preparing the hybrid at 180 °C, which benefits from balanced high reactivity and high conductivity...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774157/the-potential-liver-brain-and-embryo-toxicity-of-titanium-dioxide-nanoparticles-on-mice
#12
Xiaochuan Jia, Shuo Wang, Lei Zhou, Li Sun
Nanoscale titanium dioxide (nano-TiO2) has been widely used in industry and medicine. However, the safety of nano-TiO2 exposure remains unclear. In this study, we evaluated the liver, brain, and embryo toxicity and the underlying mechanism of nano-TiO2 using mice models. The results showed that titanium was distributed to and accumulated in the heart, brain, spleen, lung, and kidney of mice after intraperitoneal (i.p.) nano-TiO2 exposure, in a dose-dependent manner. The organ/body weight ratios of the heart, spleen, and kidney were significantly increased, and those of the brain and lung were decreased...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774156/formation-and-luminescent-properties-of-al2o3-sioc-nanocomposites-on-the-base-of-alumina-nanoparticles-modified-by-phenyltrimethoxysilane
#13
D V Kysil, A V Vasin, S V Sevostianov, V Ya Degoda, V V Strelchuk, V M Naseka, Yu P Piryatinski, V A Tertykh, A N Nazarov, V S Lysenko
Al2O3:SiOC nanocomposites were synthesized by thermal treatment of fumed alumina nanoparticles modified by phenyltrimethoxysilane. The effect of annealing temperature in inert ambient on structure and photoluminescence of modified alumina powder was studied by IR spectroscopy as well as photoluminescence spectroscopy with ultraviolet and X-ray excitation. It is demonstrated that increase of annealing temperature results in formation of silica precipitates on the surface of alumina particles that is accompanied by development and spectral evolution of visible photoluminescence...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774155/facile-fabrication-of-multi-hierarchical-porous-polyaniline-composite-as-pressure-sensor-and-gas-sensor-with-adjustable-sensitivity
#14
Xiao-Xiao He, Jin-Tao Li, Xian-Sheng Jia, Lu Tong, Xiao-Xiong Wang, Jun Zhang, Jie Zheng, Xin Ning, Yun-Ze Long
A multi-hierarchical porous polyaniline (PANI) composite which could be used in good performance pressure sensor and adjustable sensitivity gas sensor has been fabricated by a facile in situ polymerization. Commercial grade sponge was utilized as a template scaffold to deposit PANI via in situ polymerization. With abundant interconnected pores throughout the whole structure, the sponge provided sufficient surface for the growth of PANI nanobranches. The flexible porous structure helped the composite to show high performance in pressure detection with fast response and favorable recoverability and gas detection with adjustable sensitivity...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774154/paramagnetic-properties-of-fullerene-derived-nanomaterials-and-their-polymer-composites-drastic-pumping-out-effect
#15
Andriy A Konchits, Bela D Shanina, Serhii V Krasnovyd, Alexander I Burya, Olga Yu Kuznetsova
The evolution of paramagnetic properties of the fullerene soot (FS), fullerene black (FB), and their polymer composites Phenylon C-2/FS, FB has been studied using the electron paramagnetic resonance (EPR) method. For the first time, a drastic growth of the EPR signals in the FB, FS, and composite samples was observed under pumping out at temperatures T = 20 ÷ 300 °C, which is attributed to the interaction between carbon defects and adsorbed gas molecules, mainly oxygen.It is shown that the ensemble of paramagnetic centers in the FB, FS, and the composite is heterogeneous...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774153/properties-of-longitudinal-electromagnetic-oscillations-in-metals-and-their-excitation-at-planar-and-spherical-surfaces
#16
Vitaly V Datsyuk, Oleg R Pavlyniuk
The common definition of the spatially dispersive permittivity is revised. The response of the degenerate electron gas on an electric field satisfying the vector Helmholtz equation is found with a solution to the Boltzmann equation. The calculated longitudinal dielectric function coincides with that obtained by Klimontovich and Silin in 1952 and Lindhard in 1954. However, it depends on the square of the wavenumber, a parameter of the vector Helmholtz equation, but not the wave vector of a plane electromagnetic wave...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774152/ultrasensitive-biosensor-for-the-detection-of-vibrio-cholerae-dna-with-polystyrene-co-acrylic-acid-composite-nanospheres
#17
Mahbubur Rahman, Lee Yook Heng, Dedi Futra, Tan Ling Ling
An ultrasensitive electrochemical biosensor for the determination of pathogenic Vibrio cholerae (V. cholerae) DNA was developed based on polystyrene-co-acrylic acid (PSA) latex nanospheres-gold nanoparticles composite (PSA-AuNPs) DNA carrier matrix. Differential pulse voltammetry (DPV) using an electroactive anthraquninone oligonucleotide label was used for measuring the biosensor response. Loading of gold nanoparticles (AuNPs) on the DNA-latex particle electrode has significantly amplified the faradaic current of DNA hybridisation...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28759987/theoretical-investigation-of-biaxially-tensile-strained-germanium-nanowires
#18
Zhongyunshen Zhu, Yuxin Song, Qimiao Chen, Zhenpu Zhang, Liyao Zhang, Yaoyao Li, Shumin Wang
We theoretically investigate highly tensile-strained Ge nanowires laterally on GaSb. Finite element method has been used to simulate the residual elastic strain in the Ge nanowire. The total energy increment including strain energy, surface energy, and edge energy before and after Ge deposition is calculated in different situations. The result indicates that the Ge nanowire on GaSb is apt to grow along 〈100〉 rather than 〈110〉 in the two situations and prefers to be exposed by {105} facets when deposited a small amount of Ge but to be exposed by {110} when the amount of Ge exceeds a critical value...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28759986/electrical-properties-of-composite-materials-with-electric-field-assisted-alignment-of-nanocarbon-fillers
#19
Olena Yakovenko, Ludmila Matzui, Ganna Danylova, Victor Zadorozhnii, Ludmila Vovchenko, Yulia Perets, Oleksandra Lazarenko
The article reports about electric field-induced alignment of the carbon nanoparticles embedded in epoxy matrix. Optical microscopy was performed to consider the effect of the electric field magnitude and configuration, filler morphology, and aspect ratio on alignment process. Characteristic time of aligned network formation was compared with modeling predictions. Carbon nanotube and graphite nanoplatelet rotation time was estimated using an analytical model based on effective medium approach. Different depolarization factor was applied according to the geometries of the particle and electric field...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28754038/two-step-deposition-of-al-doped-zno-on-p-gan-to-form-ohmic-contacts
#20
Xi Su, Guozhen Zhang, Xiao Wang, Chao Chen, Hao Wu, Chang Liu
Al-doped ZnO (AZO) thin films were deposited directly on p-GaN substrates by using a two-step deposition consisting of polymer assisted deposition (PAD) and atomic layer deposition (ALD) methods. Ohmic contacts of the AZO on p-GaN have been formed. The lowest sheet resistance of the two-step prepared AZO films reached to 145 Ω/sq, and the specific contact resistance reduced to 1.47 × 10(-2) Ω·cm(2). Transmittance of the AZO films remained above 80% in the visible region. The combination of PAD and ALD technique can be used to prepare p-type ohmic contacts for optoelectronics...
December 2017: Nanoscale Research Letters
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