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Jiaye Su, Yunzhen Zhao, Chang Fang
Graphene is a versatile 2D material and attracts increasing attentions from a broad scientific community, including novel nanofluidic devices. In this work, we use molecular dynamics simulations to study the pressure driven water transport through graphene layers, focusing on the pore size homogeneity, realized by the arrangement of two pore sizes. For a given layer number, we find the water flux exhibits an excellent linear behavior with the pressure, in agreement with the prediction of Hagen-Poiseuille equation...
March 16, 2018: Nanotechnology
Anung Riapanitra, Yusuke Asakura, Wenbin Cao, Yasuto Noda, Shu Yin
Fluorine-doped VOsub>2</sub>(M) nanoparticles have been successfully synthesized using the hydrothermal method at a supercritical temperature of 490°C. The pristine VO<sub>2</sub>(M) has the critical phase transformation temperature of 64°C. The morphology and homogeneity of the monoclinic structure VO<sub>2</sub>(M) were adopted by the fluorine-doped system. The crystallinity and particle size were reduced the bigger the concentration of fluorine doping...
March 16, 2018: Nanotechnology
Barbara Bassi, Giacomo Dacarro, Pietro Galinetto, Enrico Giulotto, Nicoletta Marchesi, Piersandro Pallavicini, Alessia Pascale, Stefano Perversi, Angelo Taglietti
The last decade came across an increasing demand of theranostic biocompatible nanodevices, possessing the double ability of diagnosis and therapy. In this work, we report the design, synthesis and step-by-step characterization of rationally coated gold nanostars (GNS) for SERS imaging and photothermal therapy (PTT) of HeLa cancer cells. The nanodevice was realized synthesizing GNS with a seed-growth approach, coating them with a controlled mixture of thiols composed of a Raman reporter and a polyethylenglicol with a terminal amino group, and then reacting these amino groups with Folic Acid (FA), in order to impart selectivity towards cancer cells which overexpress folate receptors on their membranes...
March 16, 2018: Nanotechnology
Viacheslav Sorkin, Yong-Wei Zhang
Using density functional tight-binding method, we studied the mechanical properties, deformation and failure of armchair (AC) and zigzag (ZZ) phosphorene nanotubes (PNTs) with monovacancies and divacancies subjected to uniaxial tensile strain. We found that divacancies in AC PNTs and monovacancies in ZZ PNTs possess the lowest vacancy formation energy, which increases with the tube diameter in AC PNTs and decreases in ZZ PNTs. The Young's modulus is reduced, while the radial and thickness Poisson's ratios are increased by hosted vacancies...
March 16, 2018: Nanotechnology
Oriol Blázquez, Gemma Martín, Ivan Camps, Antonio Mariscal, Julian López-Vidrier, Joan Manel Ramirez, Sergi Hernández, Sonia Estrade, Francesca Peiro, Rosalía Serna, Blas Garrido
The resistive switching properties of silicon-aluminium oxynitride (SiAlON) based devices have been studied. Electrical transport mechanisms at both resistance states were determined, exhibiting an ohmic behaviour at low resistant state and a defect-related Poole-Frenkel mechanism at high resistant state. Nevertheless, some features on the Al top-electrode are generated during the initial electroforming, suggesting some material modifications. An in-depth microscopic study at the nanoscale have been performed after the electroforming process, by acquiring scanning electron microscopy and transmission electron microscopy images...
March 16, 2018: Nanotechnology
Seiji Obata, Minoru Sato, Keishi Akada, Koichiro Saiki
A high throughput synthesis method of graphene has been required for a long time to apply graphene to industrial applications. Of the various synthesis methods, the chemical exfoliation of graphite via graphene oxide (GO) is advantageous as far as productivity is concerned; however, the quality of the graphene produced by this method is far inferior to that synthesized by other methods, such as chemical vapor deposition on metals. Developing an effective reduction and restoration method for GO on dielectric substrates has been therefore a key issue...
March 16, 2018: Nanotechnology
Nebile Isik, Elisabetta Maria Fiordaliso, Ray R LaPierre
Semiconductor nanowires (NWs) are a candidate technology for future optoelectronic devices. One of the critical issues in NWs is the control of impurity doping for the formation of p-n junctions. In this study, beryllium (p-type dopant) and tellurium (n-type dopant) in self-assisted GaAs NWs was studied. The GaAs NWs were grown on (111) Si by molecular beam epitaxy (MBE) using the self-assisted method. The dopant incorporation in the self-assisted GaAs NWs was investigated using Raman spectroscopy, photoluminescence, secondary ion mass spectrometry and electron holography...
March 15, 2018: Nanotechnology
Da Wei Zhang, Jing Wei Li, Jia Xian Luo, Pei Man Xu, Li Cheng Wei, Dan Zhou, Wei Ming Xu, Dingsheng Yuan
It is essential to synthesize low-cost, earth-abundant bifunctional electrocatalysts
 for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for
 water electrolysis. Herein, we present a one-step sulfurization method to fabricate
 Ni3S2 nanowires directly grown on Ni foam (Ni3S2 NWs/Ni) as such an electrocatalyst.
 This synthetic strategy has several advantages including facile preparation, low cost
 and even can be expanded to large-scale preparation in the practical application...
March 15, 2018: Nanotechnology
Jiangbin Su, Xianfang Zhu
The nanoinstability of single crystal Si nanowire under electron beam irradiation was in-situ investigated at room temperature by transmission electron microscopy technique. It was observed that the Si nanowire amorphized preferentially from the surface towards the center with the increasing of electron dose. In contrast, in the center of the Si nanowire the amorphization seemed much more difficult accompanying with rotation of crystal grains and compression of d-spacing. Such a preferential amorphization as athermally induced by the electron beam irradiation can be well accounted for by our proposed concepts of nanocurvature effect and energetic beam-induced athermal activation effect, while the classical knock-on mechanism and the electron beam heating effect seem inadequate to explain these processes...
March 15, 2018: Nanotechnology
Hao Huang, Xiaohui Ren, Zhongjun Li, Huide Wang, Zongyu Huang, Hui Qiao, Pinghua Tang, Jinlai Zhao, Weiyuan Liang, Yanqi Ge, Jie Liu, Jianqing Li, Xiang Qi, Han Zhang
Two dimensional (2D) Bi nano-sheets had been employed to fabricate electrodes for broadband photo-detection. A series of characterization techniques including SEM and HRTEM verify that Bi nanosheets with intact lamellar structure have been obtained after facile liquid phase exfoliation. In the meanwhile, UV-Vis and Raman spectra are also carried out and confirm the inherent optical and physical properties of Bi nanosheets. Inherited from the topological characteristics of Bi bulk counterpart, the resultant Bi nanosheet-based photo-detector exhibits preferable photo-response activity as well as environmental robustness...
March 15, 2018: Nanotechnology
You Xu, Yinghao Li, Shuli Yin, Hongjie Yu, Hairong Xue, Xiaonian Li, Hongjing Wang, Liang Wang
Design of highly active and cost-effective electrocatalysts is very important for the generation of hydrogen by electrochemical water-splitting. Herein, we report the fabrication of ultrathin nitrogen-doped graphitized carbon shell encapsulating CoRu bimetallic nanoparticles (CoRu@NCs) and demonstrated their promising feasibility for efficiently catalyzing the hydrogen evolution reaction (HER) over a wide pH range. The resultant CoRu@NC nanohybrids possess an alloy-carbon core-shell structure with encapsulated low-ruthenium-content CoRu bimetallic alloy nanoparticles (10~30 nm) as the core and ultrathin nitrogen-doped graphitized carbon layers (2~6 layers) as the shell...
March 15, 2018: Nanotechnology
Zhen Li, Fei Huang, Xin Feng, Aihua Yan, Haiming Dong, Miao Hu, Qi Li
Two-phase-coexistence technique offers intriguing variables to manoeuvre novel and enhanced functionality in a sigle-component material. Most importantly, new band alignment and perfect interfaces between two phases can strongly affect the local photoelectronic properties. However, previous efforts for achieving the two-phase coexistence are mainly restricted to specific systems and methods. Here we demonstrate a phase-transition route to acquire two-phase-coexistence niobium oxyfluoride (Nb3O7F) nanocrystals for the first time...
March 14, 2018: Nanotechnology
Fang Zhang, W Mx, Zhengping Wang, Kezhen Han, Xiaojuan Liu, Xinguang Xu
As the cousins of graphene, i.e. same group IVA element, the nonlinear absorption properties of silicene nanosheets were rarely studied. In this paper, we successfully exfoliated the two-dimensional silicene nanosheets from bulk silicon crystal using liquid phase exfoliation method. The nonlinear absorption properties of silicene nanosheets were systemically investigated for the first time, as we have known. Silicene performed exciting saturable absorption and two photon absorption behavior. The lower saturable intensity and larger two photon absorption coefficient at 532 nm excitation indicates that silicene has potential application in ultrafast lasers and optical limiting devices, especially in visible waveband...
March 14, 2018: Nanotechnology
Qi Guo, Xiaoguang Xu, Fang Wang, Yunhao Lu, Jikun Chen, Yanjun Wu, Kangkang Meng, Yong Wu, Jun Miao, Yong Jiang
We report the in-plane electric field controlled ferromagnetism of La2/3Sr1/3MnO3 (LSMO) films epitaxially deposited on [Pb(Mg1/3Nb2/3)O3]0.7-(PbTiO3)0.3 (PMN-PT) (001), (011) and (111) single crystal substrates. The in-plane coercivities (Hc∥) and remanences of the LSMO films greatly depend on the in-plane electric field applied on the PMN-PT (001) and (011) substrates. The experimental change of Hc∥ is consistent with Stoner-Wohlfarth model and first principle calculation with the electric field varying from -10 to 10 kV/cm...
March 12, 2018: Nanotechnology
Junli Wang, Lei Chen, Chenxi Dou, Haiting Yan, Lingjie Meng, Zhiyi Wei
In this work, we fabricate the Mo<sub>0.5</sub>W<sub>0.5</sub>S<sub>2</sub> by microwave-assisted solvothermal method, and report the Q-switched Yb-doped fiber lasers using Mo<sub>0.5</sub>W<sub>0.5</sub>S<sub>2</sub> nanosheets polymer film and tapered fiber as the saturable absorbers (SAs). The modulation depth and saturable intensity of the film SA are 5...
March 12, 2018: Nanotechnology
Daniela Di Felice, Yannick J Dappe, César González
A theoretical study of a graphene-like tip used in Atomic Force Microscopy (AFM) is presented. Based on first principles simulations, we have proved the low reactivity of this kind of tip, using a MoS<sub>2</sub> monolayer as the testing sample. Our simulations show that the tip-MoS<sub>2</sub> interaction is mediated through weak van der Waals (vdW) forces. Even on the defective monolayer, the interaction is reduced one order of magnitude with respect to the values obtained using a highly reactive metallic tip...
March 12, 2018: Nanotechnology
Hitomi Mukaibo, Tonghui Wang, Victor H Perez-Gonzalez, Jirachai Getpreecharsawas, Jack T Wurzer, Blanca Lapizco-Encinas, James L McGrath
Insulator-based dielectrophoresis (iDEP) is a simple, scalable mechanism that can be used for directly manipulating particle trajectories in pore-based filtration and separation processes. However, iDEP manipulation of nanoparticles presents unique challenges as the dielectrophoretic force (<b><i>F</i></b><sub>DEP</sub>) exerted on the nanoparticles can easily be overshadowed by opposing kinetic forces. In this study, a molecularly thin, SiN-based nanoporous membrane (NPN) is explored as a breakthrough technology that enhances <b><i>F</i></b><sub>DEP</sub>...
March 12, 2018: Nanotechnology
Yu Zhang, Xiaoping Xiao, Ting Shu, Cai Jing, Xinlan Xiao, Yan-Shu Li, Zhongwei Zhang, Qun Tang
Manganese-based (chemically formulated of KMnF3) nanocrystal was evaluated as a liver-specific contrast agent for MR imaging, and also compare its imaging performance with those of two commercial hepatobiliary contrast media (Gd-EOB-DTPA and Mn-DPDP). KMnF3 nanocrystal was post-treated using plasma technique to cause severe defects, leading to appropriate water-dispersibility and high relaxivity. Severely defective KMnF3 nanocrystal (SD-KMnF3) is characteristic of high tolerance, as evidenced with cytotoxicity on macrophage cell, acute and subchronic toxicity on the healthy mouse...
March 12, 2018: Nanotechnology
Yusuke Asakura, Yuto Anada, Ryo Hamanaka, Tsugio Sato, Ken-Ichi Katsumata, Xiaoyong Wu, Shu Yin
Various types of coating films were obtained from hydrothermally synthesized Nb-doped TiO<sub>2</sub> (NTO) and Cs<sub><i>x</i></sub>WO<sub>3</sub> (CWO) nanoparticles. The coating films possessed multifunctionality including near infrared absorption and photocatalysis abilities. The NTO and CWO nanoparticles were synthesized by a unique solvothermal reaction in which water induced by esterification reaction between alcohol and carboxylic acid can act as a hydrolyzing agent for metal precursors...
March 12, 2018: Nanotechnology
Jyun-Hong Chen, Yuan-Liang Zhong, Lain-Jong Li, Chii-Dong Chen
Two-dimensional electron gas (2DEG) is crucial in condensed matter physics and is present on the surface of liquid helium and at the interface of semiconductors. Monolayer MoS2 of 2D materials also contains 2DEG in an atomic layer as field effect transistor (FET) ultrathin channel. In this study, we synthesized double triangular MoS<sub>2</sub> through a chemical vapor deposition method to obtain grain boundaries for forming a ripple structure in FET channel. When the temperature was higher than approximately 175 K, the temperature dependence of the electron mobility μ was consistent with those in previous experiments and theoretical predictions...
March 12, 2018: Nanotechnology
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