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Molybdenum

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https://www.readbyqxmd.com/read/28633527/molecular-beam-epitaxy-of-highly-crystalline-monolayer-molybdenum-disulfide-on-hexagonal-boron-nitride
#1
Deyi Fu, Xiaoxu Zhao, Yu-Yang Zhang, Linjun Li, Hai Xu, A-Rang Jang, Seong In Yoon, Peng Song, Sock Mui Poh, Tianhua Ren, Zijing Ding, Wei Fu, Tae Joo Shin, Hyeon Suk Shin, Sokrates T Pantelides, Wu Zhou, Kian Ping Loh
Atomically thin molybdenum disulfide (MoS2), a direct-band-gap semiconductor, is promising for applications in electronics and optoelectronics but the scalable synthesis of highly-crystalline film remains challenging. Here we report the successful epitaxial growth of a continuous, uniform, highly-crystalline monolayer MoS2 film on hexagonal boron nitride (h-BN) by molecular beam epitaxy. Atomic force microscopy and electron microscopy studies reveal that MoS2 grown on h-BN primarily consists of two types of nucleation grains (0o aligned and 60o anti-aligned domains)...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28628998/a-facile-fabrication-of-silk-mos2-hybrids-for-photothermal-therapy
#2
Zhao Li, Yuhong Yang, Jinrong Yao, Zhengzhong Shao, Xin Chen
Photothermal therapy, due to its safety and effectiveness, has attracted tremendous interest in the area of cancer treatment in recent few decades. The emerging of two-dimensional transition metal dichalcogenides has provided this promising therapy with a novel genus of nanomaterials. Herein, we present a facile one-step way to prepare a hybrid of regenerated silk fibroin (RSF) and molybdenum disulfide (MoS2) nanosheets simply by directly adding MoS2 dispersion into RSF aqueous solution to induce the self-assembly of silk protein on the surface of MoS2 flakes...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628922/observation-of-three-component-fermions-in-the-topological-semimetal-molybdenum-phosphide
#3
B Q Lv, Z-L Feng, Q-N Xu, X Gao, J-Z Ma, L-Y Kong, P Richard, Y-B Huang, V N Strocov, C Fang, H-M Weng, Y-G Shi, T Qian, H Ding
In quantum field theory, Lorentz invariance leads to three types of fermion-Dirac, Weyl and Majorana. Although the existence of Weyl and Majorana fermions as elementary particles in high-energy physics is debated, all three types of fermion have been proposed to exist as low-energy, long-wavelength quasiparticle excitations in condensed-matter systems. The existence of Dirac and Weyl fermions in condensed-matter systems has been confirmed experimentally, and that of Majorana fermions is supported by various experiments...
June 19, 2017: Nature
https://www.readbyqxmd.com/read/28628325/tuning-optical-signatures-of-single-and-few-layer-mos2-by-blown-bubble-bulge-straining-up-to-fracture
#4
Rui Yang, Jaesung Lee, Souvik Ghosh, Hao Tang, R Mohan Sankaran, Christian A Zorman, Philip X-L Feng
Emerging atomic layer semiconducting crystals such as molybdenum disulfide (MoS2) are promising candidates for flexible electronics and strain-tunable devices due to their ultrahigh strain limits (up to ~20-30%) and strain-tunable bandgaps. However, high strain levels, controllable isotropic and anisotropic biaxial strains in single- and few-layer MoS2 on device-oriented flexible substrates permitting convenient and fast strain tuning, remain unexplored. Here, we demonstrate a blown-bubble bulge technique for efficiently applying large biaxial strains to atomic layer MoS2 devices on flexible substrate...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28627499/first-principles-studies-of-chromium-line-ordered-alloys-in-a-molybdenum-disulfide-monolayer
#5
Noeliarinala Felana Andriambelaza, Edwin Mapasha, Nithaya Chetty
Density functional theory (DFT) calculations have been performed to study the thermodynamic stability, structural and electronic properties of various chromium (Cr) line-ordered alloy configurations in a molybdenum disulfide (MoS<sub>2</sub>) hexagonal monolayer for band gap engineering. Only the molybdenum (Mo) sites were substituted at each concentration in this study. For comparison purpose, different Cr line-ordered alloy and random alloy configurations were studied and the most thermodynamically stable ones at each concentration were identified...
June 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28625985/periplasmic-nicotine-dehydrogenase-ndhab-utilizes-pseudoazurin-as-its-physiological-electron-acceptor-in-agrobacterium-tumefaciens-s33
#6
Wenjun Yu, Rongshui Wang, Haiyan Huang, Huijun Xie, Shuning Wang
Agrobacterium tumefaciens S33 can grow with nicotine as the sole source of carbon, nitrogen, and energy via a novel hybrid of the pyridine pathway and the pyrollidine pathway. Characterization of the enzymes involved in the hybrid pathway is important for understanding its biochemical mechanism. Here we report that the molybdenum-containing nicotine dehydrogenase (NdhAB), which catalyzes the initial step of nicotine degradation, is located in the periplasm of strain S33, while the 6-hydroxynicotine oxidase and 6-hydroxypseudooxynicoine oxidase are in the cytoplasm...
June 16, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28622725/self-supported-biocarbon-fiber-electrode-decorated-with-molybdenum-carbide-nanoparticles-for-highly-active-hydrogen-evolution-reaction
#7
Jian Xiao, Yan Zhang, Zheye Zhang, Qi-Ying Lv, Feng Jing, Kai Chi, Shuai Wang
To devise and facilely synthesize an efficient noble metal-free electrocatalyst for accelerating the sluggish kinetics in the hydrogen evolution reaction (HER) are still a big challenge for electrolytic water splitting. Herein, we present a simple one-step approach for constructing self-supported biocarbon fiber cloth decorated with molybdenum carbide nanoparticles (BCF/Mo2C) electrodes by a direct annealing treatment of the Mo oxyanions loaded cotton T-shirt. The Mo2C nanoparticles not only serve as the catalytic active sites toward the HER but also enhance the hydrophilicity and conductivity of resultant electrodes...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28622483/human-milk-fortifiers-do-not-meet-the-current-recommendation-for-nutrients-in-very-low-birth-weight-infants
#8
Winston Koo, Hilary Tice
BACKGROUND: Use of multinutrient fortifiers is standard of care for small preterm infants fed exclusively human milk. However, adequacy of human milk fortifiers (HMFs) to meet the recommended intake for macronutrients and micronutrients is now known. MATERIALS AND METHODS: Nutrient content of human milk fortified according to manufacturer's recommendations was compared at isocaloric levels for 1 human milk-based (HMF-A), 2 bovine milk protein-based (HMF-B, HMF-C), and 2 preterm infant formulas (PTF-B, PTF-C)...
June 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28616958/interconnected-molybdenum-carbide-based-nanoribbons-for-highly-efficient-and-ultrastable-hydrogen-evolution
#9
Zhihua Cheng, Jian Gao, Qiang Fu, Changxia Li, Xiaopeng Wang, Yukun Xiao, Yang Zhao, Zhipan Zhang, Liangti Qu
Electrocatalytic hydrogen evolution reaction (HER) is of great significance to produce clean, sustainable and cost-effective hydrogen. However, the development of low-cost and high efficient non-noble-metal catalysts with a combination of superior catalytic activity and long-time stability still remains a challenge. Herein, we demonstrate a rationally designed three dimensional (3D) architecture assembled from 1D molybdenum carbide (MoC) based nanoribbons where the MoC nanoparticles are embedded within nitrogen-doped crystallized carbon nanolayers (MoC@NC nanoribbon)...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28616939/ultrafast-growth-of-large-area-monolayer-mos2%C3%A2-film-via-gold-foil-assistant-cvd-for-a%C3%A2-highly%C3%A2-sensitive-photodetector
#10
Changbin Nie, Leyong Yu, Xingzhan Wei, Jun Shen, Wenqiang Lu, Weimin Chen, Shuanglong Feng, Haofei Shi
Two-dimensional molybdenum disulfide (MoS2) is a promising material for ultrasensitive photodetectors owing to its tunable band gap and high absorption coefficient. However, controlled synthesis of high-quality, large-area monolayer molybdenum disulfide (MoS2) is still a challenge in practical application. In this work, we report a gold foil assistant chemical vapor deposition method for the synthesis of large-size (>400 μm) single-crystal MoS2 film on a silicon dioxide (SiO2) substrate. The influence of Au foil in enlarging the size of single-crystal MoS2 is investigated systemically using thermal simulation in Ansys workbench 16...
July 7, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28615939/effect-of-carbon-ion-implantation-on-the-tribology-of-metal-on-metal-bearings-for-artificial-joints
#11
Hironobu Koseki, Masato Tomita, Akihiko Yonekura, Takashi Higuchi, Sinya Sunagawa, Koumei Baba, Makoto Osaki
Metal-on-metal (MoM) bearings have become popular due to a major advantage over metal-on-polymer bearings for total hip arthroplasty in that the larger femoral head and hydrodynamic lubrication of the former reduce the rate of wear. However, concerns remain regarding adverse reactions to metal debris including metallosis caused by metal wear generated at the taper-head interface and another modular junction. Our group has hypothesized that carbon ion implantation (CII) may improve metal wear properties. The purpose of this study was to investigate the wear properties and friction coefficients of CII surfaces with an aim to ultimately apply these surfaces to MoM bearings in artificial joints...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28615719/thermal-and-structural-studies-of-carbon-coated-mo2c-synthesized-via-in-situ-single-step-reduction-carburization
#12
Rameez Ahmad Mir, Piyush Sharma, Om Prakash Pandey
Carbon coated nano molybdenum carbide (Mo2C) has been synthesized at 800 °C through single step reduction route using molybdenum trioxide (MoO3) as a precursor, polypropylene (P.P) as a carbon source and magnesium (Mg) as a catalyst in an autoclave. The synthesized samples were characterized by X-ray diffraction (XRD), thermal analysis techniques (TG/DTA/DTG), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Williamson- Hall (W-H) analysis has been done to estimate various parameters like strain, stress and strain energy density...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28613069/molybdenum-disulfide-nanoparticles-as-multifunctional-inhibitors-against-alzheimer-s-disease
#13
Qiusen Han, Shuangfei Cai, Lin Yang, Xinhuan Wang, Cui Qi, Rong Yang, Chen Wang
The complex pathogenic mechanisms of Alzheimer's disease (AD) include the aggregation of β-amyloid peptides (Aβ) into oligomers or fibrils as well as Aβ-mediated oxidative stress, which require comprehensive treatment. Therefore, the inhibition of Aβ aggregation and free-radical scavenging are essential for the treatment of AD. Nanoparticles (NPs) have been found to influence Aβ aggregation process in vitro. Herein, we report the inhibition effects of molybdenum disulfide (MoS2) NPs on Aβ aggregation...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28612609/surface-water-dependent-properties-of-sulfur-rich-molybdenum-sulfides-electrolyteless-gas-phase-water-splitting
#14
Torben Daeneke, Nripen Dahr, Paul Atkin, Rhiannon M Clark, Christopher J Harrison, Robert Brkljača, Naresh Pillai, Bao Yue Zhang, Ali Zavabeti, Samuel J Ippolito, Kyle J Berean, Jian Zhen Ou, Michael S Strano, Kourosh Kalantar-Zadeh
Sulfur-rich molybdenum sulfides are an emerging class of inorganic coordination polymers that are predominantly utilized for their superior catalytic properties. Here we investigate surface water dependent properties of sulfur-rich MoSx (x = 3(2)/3) and its interaction with water vapor. We report that MoSx is a highly hygroscopic semiconductor, which can reversibly bind up to 0.9 H2O molecule per Mo. The presence of surface water is found to have a profound influence on the semiconductor's properties, modulating the material's photoluminescence by over 1 order of magnitude, in transition from dry to moist ambient...
June 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28607080/structural-studies-of-viperin-an-antiviral-radical-sam-enzyme
#15
Michael K Fenwick, Yue Li, Peter Cresswell, Yorgo Modis, Steven E Ealick
Viperin is an IFN-inducible radical S-adenosylmethionine (SAM) enzyme that inhibits viral replication. We determined crystal structures of an anaerobically prepared fragment of mouse viperin (residues 45-362) complexed with S-adenosylhomocysteine (SAH) or 5'-deoxyadenosine (5'-dAdo) and l-methionine (l-Met). Viperin contains a partial (βα)6-barrel fold with a disordered N-terminal extension (residues 45-74) and a partially ordered C-terminal extension (residues 285-362) that bridges the partial barrel to form an overall closed barrel structure...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28607079/age-of-jupiter-inferred-from-the-distinct-genetics-and-formation-times-of-meteorites
#16
Thomas S Kruijer, Christoph Burkhardt, Gerrit Budde, Thorsten Kleine
The age of Jupiter, the largest planet in our Solar System, is still unknown. Gas-giant planet formation likely involved the growth of large solid cores, followed by the accumulation of gas onto these cores. Thus, the gas-giant cores must have formed before dissipation of the solar nebula, which likely occurred within less than 10 My after Solar System formation. Although such rapid accretion of the gas-giant cores has successfully been modeled, until now it has not been possible to date their formation. Here, using molybdenum and tungsten isotope measurements on iron meteorites, we demonstrate that meteorites derive from two genetically distinct nebular reservoirs that coexisted and remained spatially separated between ∼1 My and ∼3-4 My after Solar System formation...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28605201/molybdenum-disulfide-black-phosphorus-hybrid-nanosheets-as-a-superior-catalyst-for-electrochemical-hydrogen-evolution
#17
Rong He, Jian Hua, Anqi Zhang, Chuanhao Wang, Jiayu Peng, Weijia Chen, Jie Zeng
Engineering electronic properties is a promising way to design nonprecious-metal or earth-abundant catalysts toward hydrogen evolution reaction (HER). Herein, we deposited catalytically active MoS2 flakes onto black phosphorus (BP) nanosheets to construct the MoS2-BP interfaces. In this case, electrons flew from BP to MoS2 in MoS2-BP nanosheets because of the higher Fermi level of BP than that of MoS2. MoS2-BP nanosheets exhibited remarkable HER performance with an overpotential of 85 mV at 10 mA cm(-2). Due to the electron donation from BP to MoS2, the exchange current density of MoS2-BP reached 0...
June 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28605178/epitaxial-templating-of-two-dimensional-metal-chloride-nanocrystals-on-monolayer-molybdenum-disulfide
#18
Shanshan Wang, Huashan Li, Junying Zhang, Shaoqiang Guo, Wenshuo Xu, Jeffrey C Grossman, Jamie H Warner
We demonstrate the formation of ionic metal chloride (CuCl) two-dimensional (2D) nanocrystals epitaxially templated on the surface of monolayer molybdenum disulfide (MoS2). These 2D CuCl nanocrystals are single atomic planes from a nonlayered bulk CuCl structure. They are stabilized as a 2D monolayer on the surface of the MoS2 through interactions with the uniform periodic surface of the MoS2. The heterostructure 2D system is studied at the atomic level using aberration-corrected transmission electron microscopy at 80 kV...
June 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28603968/ambipolar-mos2-transistors-by-nanoscale-tailoring-of-schottky-barrier-using-oxygen-plasma-functionalization
#19
Filippo Giannazzo, Gabriele Fisichella, Giuseppe Greco, Salvatore Di Franco, Ioannis Deretzis, Antonino La Magna, Corrado Bongiorno, Giuseppe Nicotra, Corrado Spinella, Michelangelo Scopelliti, Bruno Pignataro, Simonpietro Agnello, Fabrizio Roccaforte
One of the main challenges to exploit molybdenum disulfide (MoS2) potentialities for the next generation complementary-metal-oxide-semiconductor (CMOS) technology is the realization of p-type or ambipolar field effect transistors (FETs). Hole transport in MoS2 FETs is typically hampered by the high Schottky barrier height (SBH) for holes at source/drain contacts, due to the Fermi level pinning close to the conduction band. In this work, we show that the SBH of multilayer MoS2 surface can be tailored at nanoscale using soft O2 plasma treatments...
June 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28599407/application-of-three-dimensional-wire-localization-and-orientation-in-the-resection-of-non-palpable-breast-lesions
#20
Dechun Li, Jingjing Xu, Jie Zhang, Dandan Xia, Guoqing Shao
The aim of the present study was to compare the application value of the 3D stereo wire localization technique guided by a full digital breast X-ray machine, and general location technique in the resection of breast non-palpable lesions. A retrospective analysis of the clinical data of 80 patients with abnormal findings for non-palpable breast molybdenum target X-ray was conducted between June, 2011 and July, 2014. The patients were divided into two groups: 40 cases with a general location of lesions identified by perturbation axial + standard lateral radiograph to guide the clinical operation biopsy (group A); and 40 cases with a general location of lesions identified by the 3D stereo wire localization method to guide the clinical operation biopsy (group B)...
June 2017: Oncology Letters
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