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https://www.readbyqxmd.com/read/28447680/subthreshold-swing-improvement-in-mos2-transistors-by-the-negative-capacitance-effect-in-a-ferroelectric-al-doped-hfo2-hfo2-gate-dielectric-stack
#1
Amirhasan Nourbakhsh, Ahmad Zubair, Sameer Joglekar, Mildred Dresselhaus, Tomás Palacios
Obtaining a subthreshold swing (SS) below the thermionic limit of 60 mV dec(-1) by exploiting the negative-capacitance (NC) effect in ferroelectric (FE) materials is a novel effective technique to allow the reduction of the supply voltage and power consumption in field effect transistors (FETs). At the same time, two-dimensional layered semiconductors, such as molybdenum disulfide (MoS2), have been shown to be promising candidates to replace silicon MOSFETs in sub-5 nm-channel technology nodes. In this paper, we demonstrate NC MoS2 FETs by incorporating a ferroelectric Al-doped HfO2 (Al : HfO2), a technologically compatible material, in the FET gate stack...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28445543/comparative-genomic-analysis-between-corynebacterium-pseudotuberculosis-strains-isolated-from-buffalo
#2
Marcus Vinicius Canário Viana, Henrique Figueiredo, Rommel Ramos, Luis Carlos Guimarães, Felipe Luiz Pereira, Fernanda Alves Dorella, Salah Abdel Karim Selim, Mohammad Salaheldean, Artur Silva, Alice R Wattam, Vasco Azevedo
Corynebacterium pseudotuberculosis is a Gram-positive, pleomorphic, facultative intracellular pathogen that causes Oedematous Skin Disease (OSD) in buffalo. To better understand the pathogenic mechanisms of OSD, we performed a comparative genomic analysis of 11 strains of C. pseudotuberculosis isolated from different buffalo found to be infected in Egypt during an outbreak that occurred in 2008. Sixteen previously described pathogenicity islands (PiCp) were present in all of the new buffalo strains, but one of them, PiCp12, had an insertion that contained both a corynephage and a diphtheria toxin gene, both of which may play a role in the adaptation of C...
2017: PloS One
https://www.readbyqxmd.com/read/28443336/mop-mo2c-c-a-new-combination-of-electrocatalysts-for-highly-efficient-hydrogen-evolution-over-all-ph-range
#3
Lu-Nan Zhang, Siheng Li, Hua-Qiao Tan, Shifa Ullah Khan, Yuan-Yuan Ma, Hong-Ying Zang, Yonghui Wang, Yang-Guang Li
During the exploration of highly efficient noble-metal-free electrocatalysts for hydrogen evolution reaction (HER), a promising and challenging strategy is to fabricate composite nanocatalysts by finely tuning metal and/or non-metal element components. Herein, we report a new HER electrocatalyst, which is composed of molybdenum phosphide and molybdenum carbide composite nanoparticles (NPs) coated by few-layer N-doped graphitic carbon shells (denoted as MoP/Mo2C@C). Such a new combination mode of electrocatalysts is realized by a one-step annealing route with the mixture of a Mo/P-based polyoxometalate (POM) and dicyandiamide...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28437251/solution-processible-moo-sub-x-sub-incorporated-graphene-anode-for-efficient-polymer-light-emitting-diodes
#4
Dongchan Lee, Donghyuk Kim, Yonghee Lee, Duk Young Jeon
Graphene has attracted great attention owing to its superb properties as an anode of organic or polymer light-emitting diodes (OLEDs or PLEDs). However, there are still barriers for graphene to replace existing indium tin oxide (ITO) due to relatively high sheet resistance and workfunction mismatch. In this study, PLEDs using molybdenum oxide (MoO<sub>x</sub>) nanoparticle-doped graphene are demonstrated on a plastic substrate to have a low sheet resistance and a high workfunction. Also, this work shows how the doping amount influence on electronic properties of graphene anode and the PLED performance...
April 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28436440/a-metallic-molybdenum-dioxide-with-high-stability-for-surface-enhanced-raman-spectroscopy
#5
Qiqi Zhang, Xinshi Li, Qiang Ma, Qing Zhang, Hua Bai, Wencai Yi, Jingyao Liu, Jing Han, Guangcheng Xi
Compared with noble metals, semiconductors with surface plasmon resonance effect are another type of SERS substrate materials. The main obstacles so far are that the semiconducting materials are often unstable and easy to be further oxidized or decomposed by laser irradiating or contacting with corrosive substances. Here, we report that metallic MoO2 can be used as a SERS substrate to detect trace amounts of highly risk chemicals including bisphenol A (BPA), dichloropheno (DCP), pentachlorophenol (PCP) and so on...
April 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28436068/dinitrogen-splitting-coupled-to-protonation
#6
Gleb A Silantyev, Moritz Förster, Bastian Schluschaß, Josh Abbenseth, Christian Würtele, Christian Volkmann, Max C Holthausen, Sven Schneider
The coupling of electron- and proton-transfer steps provides a general concept to control the driving force of redox reactions. N2 splitting of a molybdenum dinitrogen complex into nitrides coupled to a reaction with Brønsted acid is reported. Remarkably, our spectroscopic, kinetic, and computational mechanistic analysis attributes N-N bond cleavage to protonation in the periphery of an amide pincer ligands rather than the {Mo-N2 -Mo} core. The strong effect on electronic structure and ultimately the thermochemistry and kinetic barrier of N-N bond cleavage is an unusual case of a proton-coupled metal-to-ligand charge transfer process, highlighting the use of proton-responsive ligands for nitrogen fixation...
April 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28435621/the-effect-of-plasma-on-shear-bond-strength-between-resin-cement-and-colored-zirconia
#7
Chan Park, Seung-Hwan Yoo, Sang-Won Park, Kwi-Dug Yun, Min-Kyung Ji, Jin-Ho Shin, Hyun-Pil Lim
PURPOSE: To investigate the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment on shear bond strength (SBS) between resin cement and colored zirconia made with metal chlorides. MATERIALS AND METHODS: 60 zirconia specimens were divided into 3 groups using coloring liquid. Each group was divided again into 2 sub-groups using plasma treatment; the experimental group was treated with plasma, and the control group was untreated. The sub-groups were: N (non-colored), C (0...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28433173/dye-adsorption-and-photo-induced-recycling-of-hydroxypropyl-cellulose-molybdenum-disulfide-composite-hydrogels
#8
Pengpeng Chen, Xiaoyan Liu, Rundong Jin, Wangyan Nie, Yifeng Zhou
A novel environmental friendly dye adsorbent composited of hydroxypropyl cellulose (HPC) and molybdenum disulfide (MoS2) were fabricated, which can be recycled and reused by illumination due to the photo-catalytic properties of MoS2. In order to promote a more homogeneous dispersion of MoS2 nanosheets in HPC, MoS2 was functionalized with HPC chains through esterification. The successful functionalization of MoS2 was confirmed by FTIR, XRD, XPS characterizations. The morphologies of the HPC and HPC-MoS2/HPC hydrogels were compared by SEM...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28432892/arsenic-chromium-molybdenum-and-selenium-geochemical-fractions-and-potential-mobilization-in-riverine-soil-profiles-originating-from-germany-and-egypt
#9
Sabry M Shaheen, Eilhann E Kwon, Jayanta K Biswas, Filip M G Tack, Yong Sik Ok, Jörg Rinklebe
The fractionation and potential mobilization of As, Cr, Mo, and Se in four floodplain soil profiles collected along the Nile (Egypt) and Wupper (Germany) Rivers were assessed using the BCR sequential extraction procedure. The concentrations of total and the geochemical fractions (acid soluble (F1), reducible (F2), oxidizable (F3), and residual (F4) fraction) of the elements were determined. The Wupper soils had the highest total concentrations (mg kg(-1)) of As (378) and Cr (2,797) while the Nile soils contained the highest total Mo (12) and Se (42)...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28429782/electrochemical-generation-of-sulfur-vacancies-in-the-basal-plane-of-mos2-for-hydrogen-evolution
#10
Charlie Tsai, Hong Li, Sangwook Park, Joonsuk Park, Hyun Soo Han, Jens K Nørskov, Xiaolin Zheng, Frank Abild-Pedersen
Recently, sulfur (S)-vacancies created on the basal plane of 2H-molybdenum disulfide (MoS2) using argon plasma exposure exhibited higher intrinsic activity for the electrochemical hydrogen evolution reaction than the edge sites and metallic 1T-phase of MoS2 catalysts. However, a more industrially viable alternative to the argon plasma desulfurization process is needed. In this work, we introduce a scalable route towards generating S-vacancies on the MoS2 basal plane using electrochemical desulfurization. Even though sulfur atoms on the basal plane are known to be stable and inert, we find that they can be electrochemically reduced under accessible applied potentials...
April 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28429408/mo2-b4-o9-connecting-borate-and-metal-cluster-chemistry
#11
Martin K Schmitt, Oliver Janka, Rainer Pöttgen, Christopher Benndorf, Marcos de Oliveira, Hellmut Eckert, Florian Pielnhofer, Amadeus-Samuel Tragl, Richard Weihrich, Bastian Joachim, Dirk Johrendt, Hubert Huppertz
We report on the first thoroughly characterized molybdenum borate, which was synthesized in a high-pressure/high-temperature experiment at 12.3 GPa/1300 °C using a Walker-type multianvil apparatus. Mo2 B4 O9 incorporates tetrahedral molybdenum clusters into an anionic borate crystal structure-a structural motif that has never been observed before in the wide field of borate crystal chemistry. The six bonding molecular orbitals of the [Mo4 ] tetrahedron are completely filled with 12 electrons, which are fully delocalized over the four molybdenum atoms...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28426923/potassium-promoted-molybdenum-carbide-as-a-highly-active-and-selective-catalyst-for-co2-conversion-to-co
#12
Marc D Porosoff, Jeffrey W Baldwin, Xi Peng, Giannis Mpourmpakis, Heather D Willauer
The high concentration of CO2 bound in seawater represents a significant opportunity to extract and use this CO2 as a C1 feedstock for synthetic fuels. Through an existing process patented by the U.S. Navy, CO2 and H2 can be concurrently extracted from seawater, then catalytically reacted to produce synthetic fuel. Hydrogenating CO2 directly into liquid hydrocarbons is exceptionally difficult, but by first identifying a catalyst for selective CO production via reverse water-gas shift (RWGS), CO can then be hydrogenated to fuel through Fischer-Tropsch (FT) synthesis...
April 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28423204/new-motifs-in-deoxydehydration-beyond-the-realms-of-rhenium
#13
Allan R Petersen, Peter Fristrup
The deoxydehydration (DODH) reaction remains one of the most efficient methods of reducing the oxygen content of biomass while keeping important functionality in place. This reaction is traditionally catalysed by high-valent oxorhenium species. Recent research into heterogeneous rhenium-based catalysts for DODH demonstrates their ability to rival and in some cases surpass their homogeneous counterparts. Furthermore, catalysts based on the metals molybdenum and vanadium show great potential as inexpensive alternatives to rhenium catalysts...
April 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28418679/bioresponsive-polyoxometalate-cluster-for-redox-activated-photoacoustic-imaging-guided-photothermal-cancer-therapy
#14
Dalong Ni, Dawei Jiang, Hector F Valdovinos, Emily B Ehlerding, Bo Yu, Todd E Barnhart, Peng Huang, Weibo Cai
Although various types of imaging agents have been developed for photoacoustic (PA) imaging, relatively few imaging agents exhibit high selectivity/sensitivity to the tumor microenvironment for on-demand PA imaging and therapy. Herein, molybdenum-based polyoxometalate (POM) clusters with the highest oxidation state of Mo(VI) (denoted as Ox-POM) were designed as novel agents for redox-activated PA imaging-guided photothermal therapy. Capable of escaping from recognition and capture by the liver and spleen, these renal clearable clusters with ultrasmall size (hydrodynamic size: 1...
April 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28415428/the-effect-of-sliding-onto-the-metal-electrolyte-interface-studying-model-parameter-modifications-by-means-of-eis
#15
Josianne Cassar, Bertram Mallia, Andreas Karl, Joseph Buhagiar
Several problems are associated with corrosion-wear occurring on metal-on-metal hip implants made out of cobalt-chromium based alloys. Low temperature carburizing, a process that creates a hard and corrosion resistant diffused layer in Cobalt-Chromium-Molybdenum (CoCrMo) alloys, known as S-phase, may be a possible solution towards mitigating these problems. In this work, static- and tribo-corrosion testing involving an alumina versus CoCrMo (untreated and carburized) were conducted in Ringer's solution. Electrochemical impedance spectroscopy was used to compare impedance plots attained before and after sliding so as to understand how the metal-electrolyte interface is affected by rubbing...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414434/ammonia-activation-h2-evolution-and-nitride-formation-from-a-molybdenum-complex-with-a-chemically-and-redox-non-innocent-ligand
#16
Grant W Margulieux, Mate J Bezdek, Zoë R Turner, Paul J Chirik
Treatment of the bis(imino)pyridine molybdenum η6-benzene complex (iPrPDI)Mo(η6-C6H6) (iPrPDI, 2,6-(2,6-iPr2C6H3N=CMe)2C5H3N) with NH3 resulted in coordination in-duced haptotropic rearrangement of the arene to form (iPrPDI)Mo(NH3)2(η2-C6H6). Analogous η2-ethylene and η2-cyclohexene complexes were also synthesized and the latter crystallo-graphically characterized. All three compounds undergo loss of the η2-coordinated ligand followed by N-H bond activation, bis(imino)pyridine modification and H2 loss...
April 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28411570/impacts-of-coal-fly-ash-on-plant-growth-and-accumulation-of-essential-nutrients-and-trace-elements-by-alfalfa-medicago-sativa-grown-in-a-loessial-soil
#17
Honghua He, Zhigang Dong, Qi Peng, Xia Wang, Chenbin Fan, Xingchang Zhang
Coal fly ash (CFA) is a problematic solid waste all over the world. One distinct beneficial reuse of CFA is its utilization in land application as a soil amendment. A pot experiment was carried out to assess the feasibility of using CFA to improve plant growth and increase the supply of plant-essential elements and selenium (Se) of a loessial soil for agricultural purpose. Plants of alfalfa (Medicago sativa) were grown in a loessial soil amended with different rates (5%, 10%, 20% and 40%) of CFA for two years and subjected to four successive cuttings...
April 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28408286/carcinogenicity-of-welding-molybdenum-trioxide-and-indium-tin-oxide
#18
Neela Guha, Dana Loomis, Kathryn Z Guyton, Yann Grosse, Fatiha El Ghissassi, Véronique Bouvard, Lamia Benbrahim-Tallaa, Nadia Vilahur, Karen Muller, Kurt Straif
No abstract text is available yet for this article.
April 10, 2017: Lancet Oncology
https://www.readbyqxmd.com/read/28407339/an-oxygen-insensitive-hydrogen-evolution-catalyst-coated-by-a-molybdenum-based-layer-for-overall-water-splitting
#19
Angel T Garcia-Esparza, Tatsuya Shinagawa, Samy Ould-Chikh, Muhammad Qureshi, Xuyuan Peng, Nini Wei, Dalaver H Anjum, Alain Clo, Tsu-Chien Weng, Dennis Nordlund, Dimosthenis Sokaras, Jun Kubota, Kazunari Domen, Kazuhiro Takanabe
For overall water-splitting systems, it is essential to establish O2 -insensitive cathodes that allow cogeneration of H2 and O2 . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H2 evolution in the presence of O2 . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O2 gas permeation, impeding contact with active Pt...
April 13, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28406604/an-efficient-and-benign-antimicrobial-depot-based-on-silver-infused-mos2
#20
Fangfang Cao, Enguo Ju, Yan Zhang, Zhenzhen Wang, Chaoqun Liu, Wei Li, Yanyan Huang, Kai Dong, Jinsong Ren, Xiaogang Qu
Silver nanoparticles (AgNPs) have been used as a broad-spectrum antimicrobial agent, whose toxicity originates from the localized release of Ag(+) ions. However, the residual AgNPs core could generate potential risk to humans and waste of noble metals. Herein, we infused the cysteine-modified molybdenum disulfide with minimum Ag(+) ions and coated with a layer of cationic polyelectrolyte to construct an efficient and benign antimicrobial depot. The system exhibited much enhanced broad-spectrum antibacterial activity compared with an equivalent amount of silver nitrate, owing to its increasing accessibility of released Ag(+) to the cell walls of microorganisms...
April 17, 2017: ACS Nano
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