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Hua-Bo Han, Rong-Zhen Cui, Guang-Zhao Lu, Zheng-Guang Wu, You-Xuan Zheng, Liang Zhou, Hongjie Zhang
Two novel iridium(iii) complexes, Ir(tfmpiq)2(acac) (tfmpiq = 1-(2,6-bis(trifluoromethyl)pyridin-4-yl)isoquinoline, acac = acetylacetone) and Ir(tfmpqz)2(acac) (tfmpqz = 4-(2,6-bis(trifluoromethyl)pyridin-4-yl)quinazoline), were synthesized and thoroughly investigated. Both complexes emit orange-red photoluminescence with high quantum yields (Ir(tfmpiq)2(acac): λmax: 587 nm, ηPL: 42%; Ir(tfmpqz)2(acac): λmax: 588 nm, ηPL: 91%). Furthermore, the complex containing quinazoline shows higher electron mobility than that with isoquinoline...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Jinhyuk Lee, Joseph K Papp, Raphaële J Clément, Shawn Sallis, Deok-Hwang Kwon, Tan Shi, Wanli Yang, Bryan D McCloskey, Gerbrand Ceder
Recent progress in the understanding of percolation theory points to cation-disordered lithium-excess transition metal oxides as high-capacity lithium-ion cathode materials. Nevertheless, the oxygen redox processes required for these materials to deliver high capacity can trigger oxygen loss, which leads to the formation of resistive surface layers on the cathode particles. We demonstrate here that, somewhat surprisingly, fluorine can be incorporated into the bulk of disordered lithium nickel titanium molybdenum oxides using a standard solid-state method to increase the nickel content, and that this compositional modification is very effective in reducing oxygen loss, improving energy density, average voltage, and rate performance...
October 17, 2017: Nature Communications
Hua Lu, Xuetao Gan, Dong Mao, Yicun Fan, Dexing Yang, Jianlin Zhao
A novel multilayer photonic structure is proposed to achieve the strong enhancement of light absorption in monolayer molybdenum disulfide (MoS2). Both numerical and analytical results illustrate that the absolute absorption of light in this atomically thin layer can approach as high as 96% at the visible wavelengths due to the excitation of Tamm plasmon mode. It is also found that the operating wavelength and height of sharp absorption peak are particularly dependent on the layer thicknesses and period number of dielectric grating, MoS2 position in the spacer, and incident angle of light, which contribute to the tunability and selectivity of light-MoS2 interaction...
September 4, 2017: Optics Express
V E Babicheva, S Gamage, M I Stockman, Y Abate
We have studied the formation of near-field fringes when sharp edges of materials are imaged using scattering-type scanning near-field optical microscope (s-SNOM). The materials we have investigated include dielectrics, metals, a near-perfect conductor, and those that possess anisotropic permittivity and hyperbolic dispersion. For our theoretical analysis, we use a technique that combines full-wave numerical simulations of tip-sample near-field interaction and signal demodulation at higher orders akin to what is done in typical s-SNOM experiments...
October 2, 2017: Optics Express
Parikshit Sahatiya, Sushmee Badhulika
Electronic structure and carrier behavior in semiconductor junctions can be effectively modulated on the application of strain. This work represents the first demonstration of a large-area, flexible, paper-based graphene-molybdenum disulfide (Gr/MoS2) broadband photodetector using a low-cost solution-processed hydrothermal method and enhancement in photodetection through strain modulation by assembling the device on polydimethylsiloxane. Optimization, in terms of process parameters, was carried out to obtain trilayer MoS2 over Gr-cellulose paper...
October 17, 2017: Nanotechnology
Amirhossein Hasani, Quyet Van Le, Thang Phan Nguyen, Kyoung Soon Choi, Woonbae Sohn, Jang-Kyo Kim, Ho Won Jang, Soo Young Kim
A facile, highly efficient approach to obtain molybdenum trioxide (MoO3)-doped tungsten trioxide (WO3) is reported. An annealing process was used to transform ammonium tetrathiotungstate [(NH4)2WS4] to WO3 in the presence of oxygen. Ammonium tetrathiomolybdate [(NH4)2MoS4] was used as a dopant to improve the film for use in an electrochromic (EC) cell. (NH4)2MoS4 at different concentrations (10, 20, 30, and 40 mM) was added to the (NH4)2WS4 precursor by sonication and the samples were annealed at 500 °C in air...
October 16, 2017: Scientific Reports
Kathiresan Vijayaraj, Thirumalai Dinakaran, Yujeong Lee, Suhkmann Kim, Hyung Sik Kim, Jaewon Lee, Seung-Cheol Chang
We developed a new strategy for construction of a biosensor for the neurotransmitter dopamine. The biosensor was constructed by one-step electrochemical deposition of a nanocomposite in aqueous solution at pH 7.0, consisting of molybdenum disulfide, multi-walled carbon nanotubes, and polypyrrole. A series of analytical methods was performed to investigate the surface characteristics and the improved electrocatalytic effect of the nanocomposite, including cyclic voltammetry, electrochemical impedance spectroscopy, field-emission scanning electron microscopy, atomic force microscopy, and Raman spectroscopy...
October 13, 2017: Biochemical and Biophysical Research Communications
Yan Shen, Baihong Yu, Yutao Lv, Bin Li
A running-in and starved lubrication experiment is designed to investigate the heavy-duty scuffing behavior of piston ring coatings against cast iron (Fe) cylinder liner using the piston ring reciprocating liner test rig. The scuffing resistance of the piston ring with the chromium-based ceramic composite coating (CKS), and that with the thermally sprayed nickel-chromium-molybdenum coating (NCM) is compared at different nominal pressures (40~100 MPa) and temperatures (180~250 °C). With the failure time as a criterion, the rank order is as follows: NCM/Fe > CKS/Fe...
October 14, 2017: Materials
Laurie A King, Thomas R Hellstern, Joonsuk Park, Robert Sinclair, Thomas F Jaramillo
Developing materials, interfaces, and devices with improved stability remains one of the key challenges in the field of photoelectrochemical water splitting. As a barrier to corrosion, molybdenum disulfide is a particularly attractive protection layer for photocathodes due to its inherent stability in acid, the low permeability of its basal planes, and the excellent hydrogen evolution reaction (HER) activity the MoS2 edge. Here, we demonstrate a stable silicon photocathode containing a protecting layer consisting of molybdenum disulfide, molybdenum silicide, and silicon oxide which operates continuously for two months...
October 16, 2017: ACS Applied Materials & Interfaces
Nilam Qureshi, Sudhir Arbuj, Manish Shinde, Sunit Rane, Milind Kulkarni, Dinesh Amalnerkar, Haiwon Lee
Herein, we report the synthesis of metallic molybdenum microspheres and hierarchical MoS2 nanostructures by facile template-free solvothermal and hydrothermal approach, respectively. The morphological transition of the Mo microspheres to hierarchical MoS2 nanoflower architectures is observed to be accomplished with change in solvent from ethylenediamine to water. The resultant marigold flower-like MoS2 nanostructures are few layers thick with poor crystallinity while spherical ball-like molybdenum microspheres exhibit better crystalline nature...
2017: Nano Convergence
Yi Shi, Yue Zhou, Dong-Rui Yang, Wei-Xuan Xu, Chen Wang, Feng-Bin Wang, Jing-Juan Xu, Xing-Hua Xia, Hong-Yuan Chen
Water splitting devices for hydrogen generation through electrolysis (hydrogen evolution reaction, HER) hold great promise for clean energy. However, their practical application relies on the development of inexpensive and efficient catalysts to replace precious platinum catalysts. We previously reported that HER can be largely enhanced through finely tuning the energy level of molybdenum sulfide (MoS2) by hot electron injection from plasmonic gold nanoparticles. Under this inspiration, herein, we propose a strategy to improve the HER performance of MoS2 by engineering its energy level via direct transition-metal doping...
October 15, 2017: Journal of the American Chemical Society
Xusheng Wang, Kuangzhou Du, Chao Wang, Luxiang Ma, Binglu Zhao, Junfeng Yang, Meixian Li, Xin-Xiang Zhang, Mianqi Xue, Jitao Chen
Unique reversible conversion-type mechanism is reported in the amorphous molybdenum polysulfide (a-MoS5.7) cathode material. The lithiation products of metal molybdenum and Li2S2 instead of the metal and Li2S species were detected. And this process could yield a high discharge capacity of 746 mAh g-1. The recovered molybdenum polysulfide after the delithi-aiton process manifested the high reversibility of the unique conversion reaction, despite that the conventional conversion-type mechanism is generally irreversible...
October 13, 2017: ACS Applied Materials & Interfaces
Andreas Hirsch, Frank Hauke
The current state of the chemical functionalization of three types of single sheet 2D materials, namely, graphene, molybdenum disulfide (MoS2), and black phosphorus (BP) is summarized. Such 2D sheet polymers represent currently an emerging field at the interface of synthetic chemistry, physics, and materials science. Both covalent and non-covalent functionalization of sheet architectures allows for a systematic modification of their properties, i.e. an improvement of solubility and processability, the prevention of re-aggregation or a band gap tuning...
October 10, 2017: Angewandte Chemie
Yen-Chang Chen, Ang-Yu Lu, Ping Lu, Xiulin Yang, Chang-Ming Jiang, Marina Mariano, Brian Kaehr, Oliver Lin, André Taylor, Ian D Sharp, Lain-Jong Li, Stanley S Chou, Vincent Tung
The emerging molybdenum disulfide (MoS2 ) offers intriguing possibilities for realizing a transformative new catalyst for driving the hydrogen evolution reaction (HER). However, the trade-off between catalytic activity and long-term stability represents a formidable challenge and has not been extensively addressed. This study reports that metastable and temperature-sensitive chemically exfoliated MoS2 (ce-MoS2 ) can be made into electrochemically stable (5000 cycles), and thermally robust (300 °C) while maintaining synthetic scalability and excellent catalytic activity through physical-transformation into 3D structurally deformed nanostructures...
October 12, 2017: Advanced Materials
Ying Wang, Jun Xiao, Hanyu Zhu, Yao Li, Yousif Alsaid, King Yan Fong, Yao Zhou, Siqi Wang, Wu Shi, Yuan Wang, Alex Zettl, Evan J Reed, Xiang Zhang
Monolayers of transition-metal dichalcogenides (TMDs) exhibit numerous crystal phases with distinct structures, symmetries and physical properties. Exploring the physics of transitions between these different structural phases in two dimensions may provide a means of switching material properties, with implications for potential applications. Structural phase transitions in TMDs have so far been induced by thermal or chemical means; purely electrostatic control over crystal phases through electrostatic doping was recently proposed as a theoretical possibility, but has not yet been realized...
October 11, 2017: Nature
Wisit Hirunpinyopas, Eric Prestat, Stephen D Worrall, Sarah J Haigh, Robert A W Dryfe, Mark A Bissett
Laminar membranes of two-dimensional materials are excellent candidates for applications in water filtration due to the formation of nanocapillaries between individual crystals that can exhibit a molecular and ionic sieving effect, while allowing high water flux. This approach has been exemplified previously with graphene oxide, however these membranes suffer from swelling when exposed to liquid water, leading to low salt rejection and reducing their applicability for desalination applications. Here, we demonstrate that by producing thin (∼5 μm) laminar membranes of exfoliated molybdenum disulfide (MoS2) in a straightforward and scalable process, followed by a simple chemical functionalization step, we can efficiently reject ∼99% of the ions commonly found in seawater, while maintaining water fluxes significantly higher (∼5 times) than those reported for graphene oxide membranes...
October 16, 2017: ACS Nano
Ganna A Senchyk, Andrey B Lysenko, Konstantin V Domasevitch, Oliver Erhart, Stefan Henfling, Harald Krautscheid, Eduard B Rusanov, Karl W Krämer, Silvio Decurtins, Shi-Xia Liu
We investigated the coordination ability of the bis(1,2,4-triazolyl) module, tr2pr = 1,3-bis(1,2,4-triazol-4-yl)propane, toward the engineering of solid-state structures of copper polyoxomolybdates utilizing a composition space diagram approach. Different binding modes of the ligand including [N-N]-bridging and N-terminal coordination and the existence of favorable conformation forms (anti/anti, gauche/anti, and gauche/gauche) resulted in varieties of mixed metal Cu(I)/Mo(VI) and Cu(II)/Mo(VI) coordination polymers prepared under hydrothermal conditions...
October 11, 2017: Inorganic Chemistry
Chaiti Ray, Su Chan Lee, Kalimuthu Vijaya Sankar, Bingjun Jin, Jungpyo Lee, Jong Hyeok Park, Seong Chan Jun
The development of economical, proficient, and highly stable catalysts to substitute the expensive noble metal electrodes for electrocatalytic water splitting applications is exceedingly desirable. In this context, the most fascinating and challenging approach is rational designing of nanocomposite encompassing multiple components with unique functionalities. Herein, we describe the fabrication of a strongly catalytic and superb durable phosphorus-incorporated cobalt molybdenum sulfide electrocatalyst grown on carbon cloth (P-CoMoS/CC)...
October 11, 2017: ACS Applied Materials & Interfaces
Lanzhong Hao, Yunjie Liu, Zhide Han, Zhijie Xu, Jun Zhu
Molybdenum disulfide (MoS2) nanoscaled films are deposited on GaAs substrates via magnetron sputtering technique, and MoS2/GaAs heterojunctions are fabricated. The lateral photovoltaic effect (LPE) of the fabricated MoS2/GaAs heterojunctions is investigated. The results show that a large LPE can be obtained in the MoS2/n-GaAs heterojunction. The LPE exhibits a linear dependence on the position of the laser illumination and the considerably high sensitivity of 416.4 mV mm(-)(1). This sensitivity is much larger than the values in other reported MoS2-based devices...
October 10, 2017: Nanoscale Research Letters
Jan Manoušek, Irena Andršová, Vera Stejskal, Jitka Vlašínová, Milan Sepši, Jan Kuta, Jana Klánová, Michal Mazík, Jirí Jarkovský, Lenka Šnajdrová, Klára Benešová, Tomáš Novotný, Andrea Zadáková, Jindrich Špinar
Aims: To evaluate whether patients with late complications of pacemakers or implantable cardioverter-defibrillators have hypersensitivity reactions to some of the materials used in generators or in electrodes, or to environmental metal burden. Methods and results: The cohort consisted of 20 men and 4 women (mean age: 62.3 ± 17.2 years) who had a history of late complications of implanted devices. The control group involved 25 men and 8 women (mean age: 64...
August 2, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
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