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Thermal conductivity of suspended few-layer MoS2 EI SCIE Scopus
期刊论文 | 2018 , 10 (6) , 2727-2734 | NANOSCALE
WoS CC Cited Count: 2
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Abstract :

Modifying phonon thermal conductivity in nanomaterials is important not only for fundamental research but also for practical applications. However, the experiments on tailoring thermal conductivity in nanoscale, especially in two-dimensional materials, are rare due to technical challenges. In this work, we demonstrate the in situ thermal conduction measurement of MoS2 and find that its thermal conductivity can be continuously tuned to a required value from crystalline to amorphous limits. The reduction of thermal conductivity is understood from phonon-defect scattering that decreases the phonon transmission coefficient. Beyond a threshold, a sharp drop in thermal conductivity is observed, which is believed to be due to a crystalline-amorphous transition. Our method and results provide guidance for potential applications in thermoelectrics, photoelectronics, and energy harvesting where thermal management is critical with further integration and miniaturization.

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GB/T 7714 Aiyiti, Adili , Hu, Shiqian , Wang, Chengru et al. Thermal conductivity of suspended few-layer MoS2 [J]. | NANOSCALE , 2018 , 10 (6) : 2727-2734 .
MLA Aiyiti, Adili et al. "Thermal conductivity of suspended few-layer MoS2" . | NANOSCALE 10 . 6 (2018) : 2727-2734 .
APA Aiyiti, Adili , Hu, Shiqian , Wang, Chengru , Xi, Qing , Cheng, Zhaofang , Xia, Minggang et al. Thermal conductivity of suspended few-layer MoS2 . | NANOSCALE , 2018 , 10 (6) , 2727-2734 .
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Controlling straight line motion up to quantum levels by quantum measurements SCIE Scopus
期刊论文 | 2018 , 10 , 805-808 | RESULTS IN PHYSICS
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A classical charged particle moves along a straight line and interacts with a silver atom in its ground state fixed at the origin of coordinates through Biot-Savart coupling. If the silver atom initially lies in a spin superposition state of valence electron, in the co-moving reference frame the projected measurements of the spin of silver's valence electron along the z direction determine the moving direction of the charged particle. The projected measurements of that spin along the x or the y direction yield straight line motion versions of Schrodinger's cat state for the charged particle. When the spin coherence state of the silver atom suffers from its environment decoherence, as long as the silver atom's spin is entangled with the trajectories of the moving charged particle, the measurements on the silver atom's spin also yield the partial superpositions of different trajectories of the moving charged particle. It is possible to control mechanical motion up to quantum level by the means of quantum measurements.

Keyword :

Quantum measurement Straight line motion versions of Schrodinger's cat state

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GB/T 7714 Huang, Yong-Yi . Controlling straight line motion up to quantum levels by quantum measurements [J]. | RESULTS IN PHYSICS , 2018 , 10 : 805-808 .
MLA Huang, Yong-Yi . "Controlling straight line motion up to quantum levels by quantum measurements" . | RESULTS IN PHYSICS 10 (2018) : 805-808 .
APA Huang, Yong-Yi . Controlling straight line motion up to quantum levels by quantum measurements . | RESULTS IN PHYSICS , 2018 , 10 , 805-808 .
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Flexible modulation of electronic and magnetic properties of zigzag H-MoS2 nanoribbons by crack defects EI SCIE PubMed Scopus
期刊论文 | 2018 , 30 (28) | JOURNAL OF PHYSICS-CONDENSED MATTER
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Abstract :

The effects of crack defects on electronic and magnetic properties of zigzag MoS2 nanoribbons are investigated systematically by first-principles calculations based on spin-polarized density functional theory. We find that not only the electronic and spin transport ability of zigzag MoS2 nanoribbons can be enhanced significantly by the armchair crack defects, but also their magnetism could be modulated flexibly by crack defects. Our study suggests that the introduction of crack defect is a feasible way to modulate the electronic and magnetic properties of zigzag MoS2 nanoribbons. We further propose that the crack defects may also provide a useful tool for improving the performance of devices.

Keyword :

spin density zigzag MoS2 nanoribbons electronic and magnetic properties modulation first-principles charge density crack defects

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GB/T 7714 Liu, Y. C. , Ren, H. T. , Gao, P. F. et al. Flexible modulation of electronic and magnetic properties of zigzag H-MoS2 nanoribbons by crack defects [J]. | JOURNAL OF PHYSICS-CONDENSED MATTER , 2018 , 30 (28) .
MLA Liu, Y. C. et al. "Flexible modulation of electronic and magnetic properties of zigzag H-MoS2 nanoribbons by crack defects" . | JOURNAL OF PHYSICS-CONDENSED MATTER 30 . 28 (2018) .
APA Liu, Y. C. , Ren, H. T. , Gao, P. F. , Zhang, Y. , Xia, M. G. , Zhang, S. L. . Flexible modulation of electronic and magnetic properties of zigzag H-MoS2 nanoribbons by crack defects . | JOURNAL OF PHYSICS-CONDENSED MATTER , 2018 , 30 (28) .
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Half-metallic ferromagnetism prediction in MoS2-based two-dimensional superlattice from first-principles SCIE Scopus
期刊论文 | 2018 , 32 (7) | MODERN PHYSICS LETTERS B
WoS CC Cited Count: 1
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Abstract :

Half-metallic ferromagnetism (HMFM) has great potential application in spin filter. However, it is extremely rare, especially in two-dimensional (2D) materials. At present, 2D materials have drawn international interest in spintronic devices. Here, we use ab initio density functional theory (DFT) calculations to study the structural stability and electrical and magnetic properties of the MoS2-based 2D superlattice formed by inserting graphene hexagonal ring in 6 x 6 x 1 MoS2 supercell. Two kinds of structures with hexagonal carbon ring were predicted with structural stability and were shown HMFM. The two structures combine the spin transport capacity of graphene with the magnetism of the defective 2D MoS2. And they have strong covalent bonding between the C and S or Mo atoms near the interface. This work is very useful to help us to design reasonable MoS2-based spin filter.

Keyword :

first-principles graphene configurations Superlattice MoS2

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GB/T 7714 Wen, Yan-Ni , Gao, Peng-Fei , Xia, Ming-Gang et al. Half-metallic ferromagnetism prediction in MoS2-based two-dimensional superlattice from first-principles [J]. | MODERN PHYSICS LETTERS B , 2018 , 32 (7) .
MLA Wen, Yan-Ni et al. "Half-metallic ferromagnetism prediction in MoS2-based two-dimensional superlattice from first-principles" . | MODERN PHYSICS LETTERS B 32 . 7 (2018) .
APA Wen, Yan-Ni , Gao, Peng-Fei , Xia, Ming-Gang , Zhang, Sheng-Li . Half-metallic ferromagnetism prediction in MoS2-based two-dimensional superlattice from first-principles . | MODERN PHYSICS LETTERS B , 2018 , 32 (7) .
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The Measurement and Modeling Analysis for Internet Users Behavior Properties EI
会议论文 | 2018 , 2018-January , 130-133 | 2017 International Conference on Computing Intelligence and Information System, CIIS 2017
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Abstract :

The paper reports internet media user behavior characteristics measurement modeling and a preliminary investigation into interpersonal communication in the social media. It addresses the potential need to reformulate current thinking about what influences the internet media has brought to social communication. We look particularly at some of the most potent forms of today's interpersonal communication-We-chat, Weixin, QQ, Facebook, Twitter etc. The media users behavior characteristics is measured and modeling to improve communications level. We explored motivation driving behavior in social media. The serial random event chain model is adapted to analysis the event correlation. The conclusion summarizes the highlight measure point that we still need the demand for original way of interpersonal communication. The study of user behavior characteristics in the social media is great significance for the public opinions, network marketing promotion and improving user experience. © 2017 IEEE.

Keyword :

Behavior characteristic Driving behavior Event correlation Inter-personal communications Measurement model Network marketing Social communications User experience

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GB/T 7714 Ren, Yijing , Ren, R. , Wang, W.R. . The Measurement and Modeling Analysis for Internet Users Behavior Properties [C] . 2018 : 130-133 .
MLA Ren, Yijing et al. "The Measurement and Modeling Analysis for Internet Users Behavior Properties" . (2018) : 130-133 .
APA Ren, Yijing , Ren, R. , Wang, W.R. . The Measurement and Modeling Analysis for Internet Users Behavior Properties . (2018) : 130-133 .
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The spin orbital dynamics properties of vacancy diamond films using enhanced Raman scattering spectroscopy SCIE
期刊论文 | 2017 , 11 (11-12) , 716-720 | OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS | IF: 0.386
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Abstract :

We investigated the Raman scattering spectrums of difference residual stress and thickness of diamond/Si films. The spin-orbital dynamics is caused by disordered lattice coupling and electron-phonons in diamond/Si. The diamond films were prepared on a Si substrate by MPCVD with methyl-hydrogen gas mixture. The Raman scattering spectrum of diamond/Si(100) hetero-junction was found as a function of crystal size, orientation, and film thickness. A sharp peak at 1360cm(-1) is of D graphite sp(2), while the broad peak 1550 cm(-1) of a broad band mode G, which corresponds to disordered sp(2) hybridization. The transfer of diamond sp(2) content extracted from C=C peak and converted to the sp(3) spin related effect. The diamond/Si(100)densitystate shows spin-related couple of sp(3), p and d orbital hybridization.

Keyword :

Spin-orbit dynamics Diamond films Nitrogen vacancy Raman shift

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GB/T 7714 Ren, R. , Ren, Yijing , Li, Xuan . The spin orbital dynamics properties of vacancy diamond films using enhanced Raman scattering spectroscopy [J]. | OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS , 2017 , 11 (11-12) : 716-720 .
MLA Ren, R. et al. "The spin orbital dynamics properties of vacancy diamond films using enhanced Raman scattering spectroscopy" . | OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS 11 . 11-12 (2017) : 716-720 .
APA Ren, R. , Ren, Yijing , Li, Xuan . The spin orbital dynamics properties of vacancy diamond films using enhanced Raman scattering spectroscopy . | OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS , 2017 , 11 (11-12) , 716-720 .
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Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition EI SCIE Scopus
期刊论文 | 2017 , 480 , 6-12 | JOURNAL OF CRYSTAL GROWTH | IF: 1.742
WoS CC Cited Count: 1
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Abstract :

Two-dimensional transition metal dichalcogenides (TMDs) show a potential application in photoelectric device due to their excellent electrical and optical properties. Here, we report that the MoO3 pre-deposited chemical vapor deposition (CVD) is used to synthesize single crystal monolayer MoS2 triangles on 4 in. wafer. We found that the wafer-scale uniformity of MoS2 can be greatly improved by regularly depositing MoO3 particles on substrate before CVD growth. Therefore, a piece of cleanroom wiper was used as a template for implementing precise control of MoO3 pre-deposition. We found that the optimal deposition size of MoO3 particles and the distance between MoO3 particles are about 15 mu m and 0.9 mm, respectively. Both microscopic and spectroscopic characterization results demonstrate that the as-grown MoS2 is highly uniform in space distribution and crystal structure. The electronic performance of MoS2 synthesized by our method is comparable to or even slightly better than those in common CVD samples. The role of MoO3 pre-deposition is not only to effectively control the MoS2 nucleation density but also to overcome poor diffusion of MoO3 source. Our method is expected to accelerate the industrial synthesis of the atomically thin TMD materials. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

MoO3 pre-deposition Single crystal monolayer Wafer-scale uniformity Transition metal dichalcogenides (TMDs) Industrial synthesis

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GB/T 7714 Cheng, Zhaofang , Xia, Minggang , Hu, Ruixue et al. Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition [J]. | JOURNAL OF CRYSTAL GROWTH , 2017 , 480 : 6-12 .
MLA Cheng, Zhaofang et al. "Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition" . | JOURNAL OF CRYSTAL GROWTH 480 (2017) : 6-12 .
APA Cheng, Zhaofang , Xia, Minggang , Hu, Ruixue , Liang, Chunping , Liang, Gongying , Zhang, Shengli . Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition . | JOURNAL OF CRYSTAL GROWTH , 2017 , 480 , 6-12 .
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A method to calculate thermal conductivity of a nonperiodic system, bamboo Si1-xGex nanowire with axially degraded components EI SCIE
期刊论文 | 2017 , 90 (10) | EUROPEAN PHYSICAL JOURNAL B | IF: 1.536
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For a nonperiodic system, a bamboo Si1-xGex nanowire with axially degraded components, it is impossible to obtain its phonon dispersion relations through lattice dynamic or the first principle calculation. Therefore, we present a simple and available method to solve this problem. At first, the Si1-xGex nanowire with axially degraded component is divided into several sections according to its component distribution like bamboos' sections formed in the growth process. For each section with a given x value, we constructed a pseudo-cell to calculate its phonon dispersion relations. Thermal conductances of junctions and of each section are then calculated by the phonon mismatch model and the phonon transmission probability with diffusive and ballistic portions. The dependences of thermal conductivity on the length of each section and the gradient of degraded component between sections are presented. We studied thermal conductivity dependence on temperature, length and diameter of the Si1-xGex nanowire with axially degraded component. And we found kappa similar to l(0.8), in which the exponent 0.8 is ascribed to the competition between phonons ballistic and diffusive transport. Furthermore, thermal conductivities along axial (100), (110), and (111) directions are discussed in detail. The method provides a simple and available tool to study thermal conductivity of a non-period system, such as a quasiperiodic superlattice or a nanowire with axially degraded component.

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GB/T 7714 Xia, Minggang , Han, Jinyun , Cheng, Zhaofang et al. A method to calculate thermal conductivity of a nonperiodic system, bamboo Si1-xGex nanowire with axially degraded components [J]. | EUROPEAN PHYSICAL JOURNAL B , 2017 , 90 (10) .
MLA Xia, Minggang et al. "A method to calculate thermal conductivity of a nonperiodic system, bamboo Si1-xGex nanowire with axially degraded components" . | EUROPEAN PHYSICAL JOURNAL B 90 . 10 (2017) .
APA Xia, Minggang , Han, Jinyun , Cheng, Zhaofang , Zhang, Shengli , Li, Baowen . A method to calculate thermal conductivity of a nonperiodic system, bamboo Si1-xGex nanowire with axially degraded components . | EUROPEAN PHYSICAL JOURNAL B , 2017 , 90 (10) .
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Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD SCIE PubMed Scopus
期刊论文 | 2017 , 7 | SCIENTIFIC REPORTS | IF: 4.122
WoS CC Cited Count: 2
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In van der Waals epitaxial growth, the substrate plays a particularly important role in the crystal morphology. Here, we synthesized MoS2 by chemical vapour deposition on silicon carbide (SiC). The obtained MoS2 dendritic crystals show six-fold symmetry, which are different from the conventional triangular shapes on SiO2 substrate and from those with three-fold symmetry on SrTiO3 substrate. Interestingly, these MoS2 dendritic crystals on SiC exhibit an average fractal dimension 1.76, which is slightly larger than the classical Diffusion-limited-Aggregation fractal dimension 1.66. The first principle calculation indicates that the six-fold symmetry of the dendritic MoS2 is determined by the lattice symmetry of SiC. To further demonstrating the substrate effect, we break the natural sixfold lattice symmetry of SiC (0001) into groove arrays through etching the substrate. And then we successfully synthesized cross-type dendritic crystal MoS2 with two-fold symmetry. Its average fractal dimension 1.83 is slightly larger than the fractal dimension 1.76 of the previous MoS2 dendrite with six-fold symmetry. In a word, the symmetry of SiC substrate determined the symmetry and the fractal dimension of the dendritic MoS2. This work provides one possibility of inducing the growth orientation of dendritic crystals through controlling the substrate surface symmetry artificially.

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GB/T 7714 Wu, Di , Min, Tai , Zhou, Jian et al. Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD [J]. | SCIENTIFIC REPORTS , 2017 , 7 .
MLA Wu, Di et al. "Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD" . | SCIENTIFIC REPORTS 7 (2017) .
APA Wu, Di , Min, Tai , Zhou, Jian , Li, Chen , Ma, Guobin , Lu, Gaotian et al. Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD . | SCIENTIFIC REPORTS , 2017 , 7 .
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Modifying the Surface Properties of Iron Oxide Nanoparticles with Organic-Inorganic Shells EI SCIE Scopus
期刊论文 | 2017 , 17 (3) , 1957-1962 | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | IF: 1.354
WoS CC Cited Count: 1
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The synthesis, processing and characterization of first-ever-available Fe3O4@ Poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol)@Au(Fe3O4@ PZS@ Au) and Fe3O4@ PZS@ TiO2 nanocomposites have been studied here. Monodisperse Fe3O4 magnetic nanoparticles were synthesized and the core/shell Fe3O4@ PZS nanocomposites were prepared via coating the highly cross-linked stabilizer PZS obtained by the polycondensation of co-monomers hexachlorocyclotriphosphazene (HCCP) and 4,4'-sulfonyldiphenol (BPS). Furthermore, Fe3O4@ PZS@ Au and Fe3O4@ PZS@ TiO2 nanocomposites with well-defined core/shell/shell nanostructure were achieved by reducing HAuCl4 solution and hydrolysis of titanium tetrabutoxide (TBOT). The morphology, phase composition, and crystallinity of the as-prepared nanocomposites have been characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (XRD). The magnetic properties of Fe3O4@ PZS@ Au and Fe3O4@ PZS@ TiO2 nanocomposites remain almost independent of addition coated particles. UV-vis absorption spectra of Fe3O4@ PZS@ Au nanocomposites shows blue-shift from 551 nm to 540 nm with increasing the thickness of Au-coating.

Keyword :

Fe3O4 Nanoparticles Fe3O4@ PZS@ Au Nanocomposites Polyphosphazene Fe3O4@ PZS@ TiO2 Nanocomposites

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GB/T 7714 Zhao, Zhongxia , Ren, R. , Li, Xuan et al. Modifying the Surface Properties of Iron Oxide Nanoparticles with Organic-Inorganic Shells [J]. | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY , 2017 , 17 (3) : 1957-1962 .
MLA Zhao, Zhongxia et al. "Modifying the Surface Properties of Iron Oxide Nanoparticles with Organic-Inorganic Shells" . | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 17 . 3 (2017) : 1957-1962 .
APA Zhao, Zhongxia , Ren, R. , Li, Xuan , Xu, Rongdong , Wu, Ziqiang , Wen, Liya et al. Modifying the Surface Properties of Iron Oxide Nanoparticles with Organic-Inorganic Shells . | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY , 2017 , 17 (3) , 1957-1962 .
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