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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/28637351/tuning-surface-chemistry-of-polyetheretherketone-by-gold-coating-and-plasma-treatment
#1
Zdeňka Novotná, Silvie Rimpelová, Petr Juřík, Martin Veselý, Zdeňka Kolská, Tomáš Hubáček, Jakub Borovec, Václav Švorčík
Polyetheretherketone (PEEK) has good chemical and biomechanical properties that are excellent for biomedical applications. However, PEEK exhibits hydrophobic and other surface characteristics which cause limited cell adhesion. We have investigated the potential of Ar plasma treatment for the formation of a nanostructured PEEK surface in order to enhance cell adhesion. The specific aim of this study was to reveal the effect of the interface of plasma-treated and gold-coated PEEK matrices on adhesion and spreading of mouse embryonic fibroblasts...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637350/structural-peculiarities-of-ion-conductive-organic-inorganic-polymer-composites-based-on-aliphatic-epoxy-resin-and-salt-of-lithium-perchlorate
#2
Liubov Matkovska, Maksym Iurzhenko, Yevgen Mamunya, Igor Tkachenko, Valeriy Demchenko, Volodymyr Synyuk, Andriy Shadrin, Gisele Boiteux
The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electron microscopy, elemental analysis, and transmission and reflective optical microscopy. On the one hand, the results showed that the introduction of LiClO4 salt into epoxy polymer leads to formation of the coordinative metal-polymer complexes of donor-acceptor type between central Li(+) ion and ligand...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637349/the-antibacterial-polyamide-6-zno-hierarchical-nanofibers-fabricated-by-atomic-layer-deposition-and-hydrothermal-growth
#3
Zhengduo Wang, Li Zhang, Zhongwei Liu, Lijun Sang, Lizhen Yang, Qiang Chen
In this paper, we report the combination of atomic layer deposition (ALD) with hydrothermal techniques to deposit ZnO on electrospun polyamide 6 (PA 6) nanofiber (NF) surface in the purpose of antibacterial application. The micro- and nanostructures of the hierarchical fibers are characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), and scanning transmission electron microscopy (STEM). We find that NFs can grow into "water lily"- and "caterpillar"-like shapes, which depend on the number of ALD cycles and the hydrothermal reaction period...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637348/hydrogen-peroxide-sensing-based-on-inner-surfaces-modification-of-solid-state-nanopore
#4
Libo Zhu, Dejian Gu, Quanjun Liu
There are many techniques for the detection of molecules. But detection of molecules through solid-state nanopore in a solution is one of the promising, high-throughput, and low-cost technology used these days. In the present investigation, a solid-state nanopore platform was fabricated for the detection of hydrogen peroxide (H2O2), which is not only a label free product but also a significant participant in the redox reaction. We have successfully fabricated silicon nitride (Si3N4) nanopores with diameters of ~50 nm by using a focused Ga ion beam, the inner surface of the nanopore has been modified with horseradish peroxidase (HRP) by employing carbodiimide coupling chemistry...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28629209/fabrication-of-nanoshell-based-3d-periodic-structures-by-templating-process-using-solution-derived-zno
#5
Shinji Araki, Yasuaki Ishikawa, Xudongfang Wang, Mutsunori Uenuma, Donghwi Cho, Seokwoo Jeon, Yukiharu Uraoka
Fabrication methods for a 3D periodic nanostructure with excellent and unique properties for various applications, such as photonic and phononic crystals, have attracted considerable interest. Templating processes using colloidal crystals have been proposed to create nanoshell-based 3D structures over a large area with ease. However, there are technical limitations in structural design, resulting in difficulties for structural flexibility. Here, we demonstrate a combination of proximity field nanopatterning and infiltration processes using solution-derived ZnO for a nanoshell-based 3D periodic structure with high structural flexibility and controllability...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28629208/breaking-through-the-multi-mesa-channel-width-limited-of-normally-off-gan-hemts-through-modulation-of-the-via-hole-length
#6
Cheng-Yen Chien, Wen-Hsin Wu, Yao-Hong You, Jun-Huei Lin, Chia-Yu Lee, Wen-Ching Hsu, Chieh-Hsiung Kuan, Ray-Ming Lin
We present new normally off GaN high-electron-mobility transistors (HEMTs) that overcome the typical limitations in multi-mesa-channel (MMC) width through modulation of the via-hole-length to regulate the charge neutrality screen effect. We have prepared enhancement-mode (E-mode) GaN HEMTs having widths of up to 300 nm, based on an enhanced surface pinning effect. E-mode GaN HEMTs having MMC structures and widths as well as via-hole-lengths of 100 nm/2 μm and 300 nm/6 μm, respectively, exhibited positive threshold voltages (V th) of 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622720/a-rram-integrated-4t-sram-with-self-inhibit-resistive-switching-load-by-pure-cmos-logic-process
#7
Meng-Yin Hsu, Chu-Feng Liao, Yi-Hong Shih, Chrong Jung Lin, Ya-Chin King
This paper reports a novel full logic compatible 4T2R non-volatile static random access memory (nv-SRAM) featuring its self-inhibit data storing mechanism for in low-power/high-speed SRAM application. With compact cell area and full logic compatibility, this new nv-SRAM incorporates two STI-ReRAMs embedded inside the 4T SRAM. Data can be read/write through a cross-couple volatile structure for maintaining fast accessing speed. Data can be non-volatilely stored in new SRAM cell through a unique self-inhibit operation onto the resistive random access memory (RRAM) load, achieving zero static power during data hold...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622719/toward-tio2-nanofluids-part-1-preparation-and-properties
#8
REVIEW
Liu Yang, Yuhan Hu
As a new generation of working fluid, nanofluid has long been regarded as a hot research topic in the past three decades. Many review papers have provided comprehensive and systematic summaries on the development and state-of-the-art of nanofluids. As of today, it is becoming increasingly difficult to provide a comprehensive review of all kinds of nanofluids owing to the huge amounts of the related literatures. And many controversies and inconsistencies in the reported arguments have been observed in various nanofluids...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622718/surface-effect-on-oil-transportation-in-nanochannel-a-molecular-dynamics-study
#9
Haixia Zheng, Yonggang Du, Qingzhong Xue, Lei Zhu, Xiaofang Li, Shuangfang Lu, Yakang Jin
In this work, we investigate the dynamics mechanism of oil transportation in nanochannel using molecular dynamics simulations. It is demonstrated that the interaction between oil molecules and nanochannel has a great effect on the transportation properties of oil in nanochannel. Because of different interactions between oil molecules and channel, the center of mass (COM) displacement of oil in a 6-nm channel is over 30 times larger than that in a 2-nm channel, and the diffusion coefficient of oil molecules at the center of a 6-nm channel is almost two times more than that near the channel surface...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622717/synthesis-and-electrochemical-properties-of-lini0-5mn1-5o4-cathode-materials-with-cr-3-and-f-composite-doping-for-lithium-ion-batteries
#10
Jun Li, Shaofang Li, Shuaijun Xu, Si Huang, Jianxin Zhu
A Cr(3+) and F(-) composite-doped LiNi0.5Mn1.5O4 cathode material was synthesized by the solid-state method, and the influence of the doping amount on the material's physical and electrochemical properties was investigated. The structure and morphology of the cathode material were characterized by XRD, SEM, TEM, and HRTEM, and the results revealed that the sample exhibited clear spinel features. No Cr(3+) and F(-) impurity phases were found, and the spinel structure became more stable. The results of the charge/discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) test results suggested that LiCr0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622716/a-new-method-without-organic-solvent-to-targeted-nanodrug-for-enhanced-anticancer-efficacy
#11
Shichao Wu, Xiangrui Yang, Mingyuan Zou, Zhenqing Hou, Jianghua Yan
Since the hydrophobic group is always essential to the synthesis of the drug-loaded nanoparticles, a majority of the methods rely heavily on organic solvent, which may not be completely removed and might be a potential threat to the patients. In this study, we completely "green" synthesized 10-hydroxycamptothecine (HCPT) loaded, folate (FA)-modified nanoneedles (HFNDs) for highly efficient cancer therapy with high drug loading, targeting property, and imaging capability. It should be noted that no organic solvent was used in the preparation process...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622715/nanotechniques-inactivate-cancer-stem-cells
#12
Anatoliy N Goltsev, Natalya N Babenko, Yulia A Gaevskaya, Nikolay A Bondarovich, Tatiana G Dubrava, Maksim V Ostankov, Olga V Chelombitko, Yuriy V Malyukin, Vladimir K Klochkov, Nataliya S Kavok
One of the tasks of current oncology is identification of cancer stem cells and search of therapeutic means capable of their specific inhibition. The paper presents the data on phenotype characteristics of Ehrlich carcinoma cells as convenient and easy-to-follow model of tumor growth. The evidence of cancer stem cells as a part of Ehrlich carcinoma and significance of CD44(+) and CD44(-) subpopulations in maintaining the growth of this type of tumor were demonstrated. A high (tenfold) tumorigenic activity of the Ehrlich carcinoma CD44(+) cells if compared to CD44(-) cells was proven...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622714/nico2s4-nimoo4-core-shell-heterostructure-nanotube-arrays-grown-on-ni-foam-as-a-binder-free-electrode-displayed-high-electrochemical-performance-with-high-capacity
#13
Yan Zhang, Jie Xu, Yayun Zheng, Yingjiu Zhang, Xing Hu, Tingting Xu
Core-shell-structured system has been proved as one of the best architecture for clean energy products owing to its inherited superiorities from both the core and the shell part, which can provide better conductivity and high surface area. Herein, a hierarchical core-shell NiCo2S4@NiMoO4 heterostructure nanotube array on Ni foam (NF) (NiCo2S4@NiMoO4/NF) has been successfully fabricated. Because of its novel heterostructure, the capacitive performance has been enhanced. A specific capacitance up to 2006 F g(-1) was obtained at a current density of 5 mA cm(-2), which was far higher than that of pristine NiCo2S4 nanotube arrays (about 1264 F g(-1))...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618720/structure-and-electronic-properties-of-transition-metal-doped-kaolinite-nanoclay
#14
Liangjie Fu, Huaming Yang
In this work, a series of transition metal (Cr, Mn, Fe, and Co) doped kaolinite nanoclays were investigated by density functional theory (DFT) calculations. The influence of metal doping on geometric structure and electronic structure of kaolinite was analyzed. The ferromagnetic (FM), antiferromagnetic (AFM), and nonmagnetic (NM) states of transition metal (TM) doped kaolinite structures were studied. The crystal volume, lattice parameters, bond length, charge, and spin were calculated by dispersion-corrected density functional theory (DFT-D2)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618719/a-short-progress-report-on-high-efficiency-perovskite-solar-cells
#15
REVIEW
He Tang, Shengsheng He, Chuangwei Peng
Faced with the increasingly serious energy and environmental crisis in the world nowadays, the development of renewable energy has attracted increasingly more attention of all countries. Solar energy as an abundant and cheap energy is one of the most promising renewable energy sources. While high-performance solar cells have been well developed in the last couple of decades, the high module cost largely hinders wide deployment of photovoltaic devices. In the last 10 years, this urgent demand for cost-effective solar cells greatly facilitates the research of solar cells...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618718/modulation-of-electronic-and-optical-anisotropy-properties-of-ml-gas-by-vertical-electric-field
#16
Fei Guo, Yaping Wu, Zhiming Wu, Congming Ke, Changjie Zhou, Ting Chen, Heng Li, Chunmiao Zhang, Mingming Fu, Junyong Kang
We investigate the electric-field-dependent optical properties and electronic behaviors of GaS monolayer by using the first-principles calculations. A reversal of the dipole transition from E//c to E⊥c anisotropy is found with a critical external electric field of about 5 V/nm. Decomposed projected band contributions exhibit asymmetric electronic structures in GaS interlayers under the external electric field, which explains the evolution of the absorption preference. Spatial distribution of the partial charge and charge density difference reveal that the strikingly reversed optical anisotropy in GaS ML is closely linked to the additional crystal field originated from the external electric field...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618717/the-electrical-properties-of-hybrid-composites-based-on-multiwall-carbon-nanotubes-with-graphite-nanoplatelets
#17
Yulia Perets, Lyudmila Aleksandrovych, Mykola Melnychenko, Oleksandra Lazarenko, Lyudmila Vovchenko, Lyudmila Matzui
In the present work, we have investigated the concentration dependences of electrical conductivity of monopolymer composites with graphite nanoplatelets or multiwall carbon nanotubes and hybrid composites with both multiwall carbon nanotubes and graphite nanoplatelets. The latter filler was added to given systems in content of 0.24 vol%. The content of multiwall carbon nanotubes is varied from 0.03 to 4 vol%. Before incorporation into the epoxy resin, the graphite nanoplatelets were subjected to ultraviolet ozone treatment for 20 min...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618716/rf-electromagnetic-field-treatment-of-tetragonal-kesterite-cztsse-light-absorbers
#18
Mykola O Semenenko, Ivan S Babichuk, Oleksandr Kyriienko, Ivan V Bodnar, Raquel Caballero, Maximo Leon
In this work, we propose a method to improve electro-optical and structural parameters of light-absorbing kesterite materials. It relies on the application of weak power hydrogen plasma discharges using electromagnetic field of radio frequency range, which improves homogeneity of the samples. The method allows to reduce strain of light absorbers and is suitable for designing solar cells based on multilayered thin film structures. Structural characteristics of tetragonal kesterite Cu2ZnSn(S, Se)4 structures and their optical properties were studied by Raman, infrared, and reflectance spectroscopies...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28618715/retention-model-of-tao-hfo-x-and-tao-alo-x-rram-with-self-rectifying-switch-characteristics
#19
Yu-De Lin, Pang-Shiu Chen, Heng-Yuan Lee, Yu-Sheng Chen, Sk Ziaur Rahaman, Kan-Hsueh Tsai, Chien-Hua Hsu, Wei-Su Chen, Pei-Hua Wang, Ya-Chin King, Chrong Jung Lin
A retention behavior model for self-rectifying TaO/HfO x - and TaO/AlO x -based resistive random-access memory (RRAM) is proposed. Trapping-type RRAM can have a high resistance state (HRS) and a low resistance state (LRS); the degradation in a LRS is usually more severe than that in a HRS, because the LRS during the SET process is limited by the internal resistor layer. However, if TaO/AlO x elements are stacked in layers, the LRS retention can be improved. The LRS retention time estimated by extrapolation method is more than 5 years at room temperature...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28610398/promotion-on-acetone-sensing-of-single-sno2-nanobelt-by-eu-doping
#20
Weiwu Chen, Zhaojun Qin, Yingkai Liu, Yan Zhang, Yanbo Li, Si Shen, Zhiming M Wang, Hai-Zhi Song
SnO2 nanobelts (NBs) have unique structural and functional properties which attract great attention in gas detecting. In this work, Eu doping is adopted to improve the gas sensitivity of pure SnO2, especially to enhance the response to one single gas. The Eu-doped SnO2 NBs, pure-SnO2 NBs, and their single NB devices are fabricated by simple techniques. The sensing properties of the two sensors have been experimentally investigated. It is found that the two sensors possess long-term stability with rapid response performance, and Eu doping improves the electronic performance and the gas-sensing response, particularly to acetone...
December 2017: Nanoscale Research Letters
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