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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/28789485/facile-synthesis-of-silver-nanowires-with-different-aspect-ratios-and-used-as-high-performance-flexible-transparent-electrodes
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/28754037/high-throughput-fabrication-of-quality-nanofibers-using-a-modified-free-surface-electrospinning
#12
Zhongbiao Shao, Liang Yu, Lan Xu, Mingdi Wang
Based on bubble electrospinning (BE), a modified free surface electrospinning (MFSE) using a cone-shaped air nozzle combined with a solution reservoir made of copper tubes was presented to increase the production of quality nanofibers. In the MFSE process, sodium dodecyl benzene sulfonates (SDBS) were added in the electrospun solution to generate bubbles on a liquid surface. The effects of applied voltage and generated bubbles on the morphology and production of nanofibers were investigated experimentally and theoretically...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28754036/influence-of-water-on-the-structure-and-dielectric-properties-of-the-microcrystalline-and-nano-cellulose
#13
Kostiantyn M Kovalov, Olexander M Alekseev, Maxim M Lazarenko, Yu F Zabashta, Yurii E Grabovskii, Sergii Yu Tkachov
Influence of water in the different states on a structure and dielectric properties of microcrystalline cellulose were studied by of X-ray, thermogravimetry, and dielectric spectroscopy. At research of microcrystalline cellulose (MCC) with different content of water, it is shown that the molecules of water are located in the macropores of MCC and in multimolecular hydrated layers. It is shown that at the increase of concentration of water in a hydrated shell, the reorganization of molecules of cellulose in the surface of crystallites takes place, and as a result, their transversal size and crystallinity increase...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28754035/erratum-to-investigations-of-heavy-metal-ion-sorption-using-nanocomposites-of-iron-modified-biochar
#14
D Kołodyńska, J Bąk, M Kozioł, L V Pylychuk
No abstract text is available yet for this article.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28747046/great-thermal-conductivity-enhancement-of-silicone-composite-with-ultra-long-copper-nanowires
#15
Liye Zhang, Junshan Yin, Wei Yu, Mingzhu Wang, Huaqing Xie
In this paper, ultra-long copper nanowires (CuNWs) were successfully synthesized at a large scale by hydrothermal reduction of divalent copper ion using oleylamine and oleic acid as dual ligands. The characteristic of CuNWs is hard and linear, which is clearly different from graphene nanoplatelets (GNPs) and multi-wall carbon nanotubes (MWCNTs). The thermal properties and models of silicone composites with three nanomaterials have been mainly researched. The maximum of thermal conductivity enhancement is up to 215% with only 1...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28747045/molecular-dynamics-modeling-and-simulation-of-diamond-cutting-of-cerium
#16
Junjie Zhang, Haibing Zheng, Maobing Shuai, Yao Li, Yang Yang, Tao Sun
The coupling between structural phase transformations and dislocations induces challenges in understanding the deformation behavior of metallic cerium at the nanoscale. In the present work, we elucidate the underlying mechanism of cerium under ultra-precision diamond cutting by means of molecular dynamics modeling and simulations. The molecular dynamics model of diamond cutting of cerium is established by assigning empirical potentials to describe atomic interactions and evaluating properties of two face-centered cubic cerium phases...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28747044/hydrothermal-assisted-sintering-strategy-towards-porous-and-hollow-structured-linb3o8-anode-material
#17
Haifa Zhai, Hairui Liu, Hongjing Li, Liuyang Zheng, Chunjie Hu, Xiang Zhang, Qiling Li, Jien Yang
Porous- and hollow-structured LiNb3O8 anode material was prepared by a hydrothermal-assisted sintering strategy for the first time. The phase evolution was studied, and the formation mechanism of the porous and hollow structure was proposed. The formation of the unique structure can be attributed to the local existence of liquid phase because of the volatilization of Li element. As the anode material, the initial discharge capacity is 285.1 mAhg(-1) at 0.1 C, the largest discharge capacity reported so far for LiNb3O8...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28747043/hydrothermal-synthesis-of-in2o3-nanoparticles-hybrid-twins-hexagonal-disk-zno-heterostructures-for-enhanced-photocatalytic-activities-and-stability
#18
Hairui Liu, Haifa Zhai, Chunjie Hu, Jien Yang, Zhiyong Liu
In2O3 nanoparticles hybrid twins hexagonal disk (THD) ZnO with different ratios were fabricated by a hydrothermal method. The as-obtained ZnO/In2O3 composites are constituted by hexagonal disks ZnO with diameters of about 1 μm and In2O3 nanoparticles with sizes of about 20-50 nm. With the increase of In2O3 content in ZnO/In2O3 composites, the absorption band edges of samples shifted from UV to visible light region. Compared with pure ZnO, the ZnO/In2O3 composites show enhanced photocatalytic activities for degradation of methyl orange (MO) and 4-nitrophenol (4-NP) under solar light irradiation...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28747042/broadband-perfect-absorber-with-monolayer-mos2-and-hexagonal-titanium-nitride-nano-disk-array
#19
Dewang Huo, Jingwen Zhang, Hao Wang, Xiaoxuan Ren, Chao Wang, Hang Su, Hua Zhao
A broadband metamaterial absorber (MA) composed of hexagonal-arranged single-sized titanium nitride (TiN) nano-disk array and monolayer molybdenum disulfide (MoS2) is studied using finite-difference time-domain (FDTD) simulations. The structure of TiN nano-disk array/dielectric silica (SiO2)/aluminum (Al) is adopted in our design. By optimizing the dimension parameters of the structure, an average absorption of 96.1% is achieved from 400 to 850 nm. In addition, by inserting a monolayer MoS2 which has high absorption at the short wavelength side underneath the TiN nano-disk array, an average absorption of 98...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28738665/aggregation-control-by-multi-stimuli-responsive-poly-n-vinylamide-derivatives-in-aqueous-system
#20
Ryo Kawatani, Yasuhiro Nishiyama, Hironari Kamikubo, Kiyomi Kakiuchi, Hiroharu Ajiro
Thermal and photo responsive copolymer based on N-vinylamide backbone was designed. Methoxyethyl group and azobenzene were selected to improve hydrophilicity and photoresponsive moieties, respectively. The N-(methoxyethyl)-N-vinylformamide was synthesized and copolymerized with N-vinylformamide by free radical polymerization. In order to control the nanosized structures, poly(N-vinylformamide) derivatives bearing azobenzene at the N-position near to the vinyl polymer main chain were synthesized by polymer reaction with the poly(N-vinylformamide-co-N-(methoxyethyl)-N-vinylformamide) and azobenzene...
December 2017: Nanoscale Research Letters
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