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https://www.readbyqxmd.com/read/30525652/temperature-controlled-vapor-deposition-of-highly-conductive-p-type-reduced-molybdenum-oxides-by-hydrogen-reduction
#1
Haiwen Dai, Ashutosh Rath, Shu Hearn Yu, Stephen J Pennycook, Daniel H C Chua
Reduced molybdenum oxide, generally MoO3-x, is a family of conductive metal oxides. During the reduction from MoO3 to various MoO3-x phases, the dielectric material becomes increasingly metallic all the way to MoO2. The interesting property through oxygen control has recently intrigued research of the MoO3-x family in multiple research areas including electrical and electrochemical application. One of the research difficulties in reduced molybdenum oxide is the lack of effective tools to control the oxygen level...
December 11, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/30517083/non-power-driven-organic-photodiode-via-junction-engineering
#2
Geon-Hee Nam, Kyounghwan Kim, Dae Sung Chung
Here we introduce a junction engineering approach to realize a high performance non-power-driven organic photodiode. To overcome the external power source dependency of conventional photodiodes, in this work, we try not only to implement an inherently large built-in-potential of the junction but also to utilize an inherently low charge carrier concentration of the semiconductor. The strategically designed ITO/plasma-treated ZnO/poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV)/MoO3 /Ag geometry showed near-ideal Schottky junction properties with a high zero-bias built-in potential of 0...
February 1, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30512029/direct-synthesis-of-mos-2-or-moo-3-via-thermolysis-of-a-dialkyl-dithiocarbamato-molybdenum-iv-complex
#3
Niting Zeng, David G Hopkinson, Ben F Spencer, Simon G McAdams, Aleksander A Tedstone, Sarah J Haigh, David J Lewis
Direct synthesis of either 2H-MoS2 or α-MoO3 is made possible by thermolysis of the same single source precursor in either argon or air at moderate temperatures.
December 4, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30505950/spontaneous-silver-doping-and-surface-passivation-of-cspbi-3-perovskite-active-layer-enable-light-emitting-devices-with-an-external-quantum-efficiency-of-11-2
#4
Min Lu, Xiaoyu Zhang, Xue Bai, Hua Wu, Xinyu Shen, Yu Zhang, Wei Zhang, Weitao Zheng, Hongwei Song, William W Yu, Andrey L Rogach
Lead halide perovskite nanocrystals are currently under intense investigation as components of solution-processed light-emitting devices (LEDs). We demonstrate LEDs based on Ag doped-passivated CsPbI3 perovskite nanocrystals with external quantum efficiency of 11.2% and an improved stability. Ag and trilayer MoO3 /Au/MoO3 structure were used as cathode and anode, respectively, which reduce the electron injection barrier and ensure the high transparency and low resistance of the anode. Silver ions diffuse into perovskite film from the Ag electrode, as confirmed by the elemental mapping, the presence of Ag 3d peaks in the X-ray photoelectron spectrum, and the peak shift in the X-ray diffraction patterns of CsPbI3 ...
July 13, 2018: ACS Energy Letters
https://www.readbyqxmd.com/read/30488253/orthogonal-gas-sensor-arrays-by-chemoresistive-material-design
#5
Nicolay J Pineau, Julia F Kompalla, Andreas T Güntner, Sotiris E Pratsinis
Gas sensor arrays often lack discrimination power to different analytes and robustness to interferants, limiting their success outside of research laboratories. This is primarily due to the widely sensitive (thus weakly-selective) nature of the constituent sensors. Here, the effect of orthogonality on array accuracy and precision by selective sensor design is investigated. Therefore, arrays of (2-5) selective and non-selective sensors are formed by systematically altering array size and composition. Their performance is evaluated with 60 random combinations of ammonia, acetone and ethanol at ppb to low ppm concentrations...
November 28, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/30480995/methylene-blue-fortified-molybdenum-trioxide-nanoparticles-harnessing-radical-scavenging-property
#6
Mohana Marimuthu, B Praveen Kumar, L Mariya Salomi, Murugan Veerapandian, Krishnaswamy Balamurugan
Hybrid nanosystem with impeccable cellular imaging and antioxidant functionality is demonstrated. The microwave-irradiation derived molybdenum trioxide nanoparticles (MoO3 NPs) were surface functionalized with cationic dye molecule, methylene blue (MB), which enables superior UV-visible absorbance and fluorescence emission wavelengths potential for bioimaging. Radical scavenging property of the pristine MoO3 NPs and MoO3-MB NPs were studied in vivo using Caenorhabditis elegans as model system. Heat shock induced oxidative stress in the C...
November 27, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30480300/3d-self-supported-ni-po-3-2-moo-3-nanorods-anchored-on-nickel-foam-for-highly-efficient-overall-water-splitting
#7
Kai Li, Jingwen Ma, Xinglong Guan, Hongwei He, Min Wang, Guoliang Zhang, Fengbao Zhang, Xiaobin Fan, Wenchao Peng, Yang Li
Electrolyzing water as a sustainable energy source is a promising and appealing method to resolve the environmental crisis. Developing efficient and stable bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is crucial and challenging in the overall water splitting process. Herein, we report the synthesis of Ni(PO3)2-MoO3 nanorods anchored on nickel foam (Ni(PO3)2-MoO3/NF) within a two-step strategy and their application as a bifunctional water splitting electrocatalyst...
November 27, 2018: Nanoscale
https://www.readbyqxmd.com/read/30478957/recent-progress-on-molybdenum-oxides-for-rechargeable-batteries
#8
Chenglin Yan, Kai Tang, Sidra Anis Farooqi, Xianfu Wang
Diminution in fossil-fuel resources and rise in energy demands require us to pursuit sustainable and rechargeable energy-storage alternatives including batteries and supercapacitors, whose electrochemical properties depend largely on the electrode materials. In the past decades, numerous electrode materials with excellent electrochemical energy-storage capability, long life span, and environmentally acceptable quality have been developed. Among the existed materials, molybdenum oxides containing MoO3 and MoO2 as well as their composites are very fascinating contenders for competent energy-storage devices because of their exceptional physicochemical properties like the thermal stability, high theoretical capability and mechanical strength...
November 26, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30472638/effect-of-electron-hole-separation-in-moo-3-ni-2-p-hybrid-nanocomposite-as-highly-efficient-metal-free-photocatalyst-for-h-2-production
#9
Yanbing Li, Zhiliang Jin, Haiyu Wang, Yupeng Zhang, Hai Liu
Effectiveness and stability of photocatalyst are of importance not only for improving H2 evolution, but also for the realization of enhanced semiconductors property in practical applications. In this study, a novel MoO3 @Ni2 P hybrid nanostructure is successfully prepared by a two step strategy of one-pot pyrolysis followed by calcination method. The reasonable design and controllable preparation of MoO3 @Ni2 P make it exhibit much high photocatalytic activities for H2 evolution with about 39.8 and 15.8 times compared to the pure MoO3 and Ni2 P...
November 13, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30465550/nanoscale-surface-reactions-by-laser-irradiation-of-al-nanoparticles-on-moo-3-flakes
#10
Connor Wolenski, Aaron Wood, Cherian J Mathai, Xiaoqing He, Jacob McFarland, Keshab Gangopadhyay, Shubhra Gangopadhyay, Matthew R Maschmann
Surface reactions between heated aluminum nanoparticles (Al NPs) and thin α-MoO3 sheets are investigated. Localized photothermal heating on Al NP clusters is provided by a Raman spectrometer laser, while enhanced heating rates and imaging resolution are enabled by the use of a plasmonic grating substrate. Prominent linear reaction zones extending from Al NPs in the 〈001〉 crystal direction are observed on the surface of the host MoO3 sheets after heating. Raman spectroscopy and x-ray diffraction indicate that α-Al2 O3 is generated within these extended reacted regions, while AFM and SEM indicate that the topology of the reaction regions are indistinguishable from the MoO3 host...
January 25, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30465425/the-influence-of-moisture-on-the-energy-level-alignment-at-the-moo-3-organic-interfaces
#11
Yanting Yin, David A Lewis, Gunther G Andersson
MoO3 is widely used in polymer-based organic solar cells as an anode buffer layer due to its high workfunction and formation of a strong dipole at the MoO3 /polymer interface facilitating the charge transfer across the MoO3 /polymer interface. In the present work we show that exposure of the MoO3 /polymer interface to moisture attracts water molecules to the interface via diffusion. Due to their own strong dipole water molecules counter the dipole at the MoO3 /polymer interface. As a consequence, the charge transfer across the MoO3 /polymer will reduce and affect the charge transport across the interface...
November 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30461256/one-dimensional-porous-hybrid-structure-of-mo2c-cop-encapsulated-in-n-doped-carbon-derived-from-mof-as-an-efficient-electrocatalyst-for-hydrogen-evolution-reaction-over-the-entire-ph-range
#12
Xiaohu Luo, Qiulan Zhou, Shuo Du, Ji Li, Lei Zhang, Kaidong Lin, Huan Li, Bo Chen, Tao Wu, Dongchu Chen, Menglei Chang, Yali Liu
The development of the outstanding noble-metal-free electrocatalysts for the hydrogen evolution reaction (HER) has attracted the broad interest. Herein, a novel one-dimensional (1D) HER hybrid catalyst consisted of cobalt phosphide (CoP) and molybdenum carbide (Mo2C) nanoparticles wrapped by the nitrogen-doped graphitic carbon (called as CoP/Mo2C-NC) was successfully fabricated by a facile continuous flow method and a simple two-step annealing process. During these processes, the successful synthesis of the MoO3 nanorods coated by cobalt zeolitic imidazolate frameworks (Co-ZIF-67) (Co-ZIF-67@MoO3) through the continuous flow method plays a key step...
November 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30443406/crystal-structure-of-bis-diiso-propyl-ammonium-molybdate
#13
Bougar Sarr, Abdou Mbaye, Cheikh Abdoul Khadir Diop, Frederic Melin, Petra Hellwig, Mamadou Sidibé, Yoann Rousselin
The organic-inorganic title salt, (C6 H16 N)2 [MoO4 ] or ( i Pr2 NH2 )2 [MoO4 ], was obtained by reacting MoO3 with diiso-propyl-amine in a 1:2 molar ratio in water. The molybdate anion is located on a twofold rotation axis and exhibits a slightly distorted tetra-hedral configuration. In the crystal structure, the diiso-propyl-ammmonium ( i Pr2 NH2 )+ cations and [MoO4 ]2- anions are linked to each other through N-H⋯O hydrogen bonds, generating rings with R 12 12 (36) motifs that give rise to the formation of a three-dimensional network...
November 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/30439886/highly-flexible-organic-inorganic-hybrid-perovskite-light-emitting-devices-based-on-an-ultrathin-au-electrode
#14
Yu-Shan Liu, Shuang Guo, Fang-Shun Yi, Jing Feng, Hong-Bo Sun
Organic-inorganic hybrid perovskite materials have received much attention in light-emitting applications during the past several years. The commonly used indium tin oxide (ITO) electrodes in perovskite light-emitting devices (PeLEDs) have unavoidable drawbacks of increasing cost and incompatibility with flexible devices, which limit the development of PeLEDs. Here, high-performance and ITO-free flexible PeLEDs utilizing ultrathin Au electrodes have been achieved and exhibited high brightness (>10,000  cdm-2 )...
November 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/30431035/phosphomolybdic-acid-as-an-efficient-hole-injection-material-in-perovskite-optoelectronic-devices
#15
Vahid Fallah Hamidabadi, Cristina Momblona, Daniel Pérez-Del-Rey, Ali Bahari, Michele Sessolo, Henk J Bolink
Efficient perovskite devices consist of a perovskite film sandwiched between charge selective layers, in order to avoid non-radiative recombination. A common metal oxide used as a p-type or hole transport layer is molybdenum oxide. MoO3 is of particular interest for its very large work function, which allows it to be used both as an interfacial charge transfer material and a dopant for organic semiconductors. However, high quality and high work function MoO3 is typically thermally evaporated in a vacuum. An alternative solution-processable high work function material is phosphomolybdic acid (PMA), which is stable, commercially available and environmentally friendly...
November 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30425262/single-crystal-moo-3-micrometer-and-millimeter-belts-prepared-from-discarded-molybdenum-disilicide-heating-elements
#16
Xiaolong Hou, Juntong Huang, Mingqiang Liu, Xibao Li, Zhihui Hu, Zhijun Feng, Meng Zhang, Junming Luo
Single-crystal MoO3 micrometer to millimeter even centimeter belts were prepared via a novel route of oxidizing a discarded molybdenum disilicide heating element at 1000 °C for 3 h. The morphology and structure features, and growth mechanism of the products were evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results indicated that the powdery and fibrous products were typical α-MoO3 belt-like structures which size could develop from micrometer to several millimeter even centimeter in length and up to 0...
November 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30412209/efficient-green-photoluminescence-and-electroluminescence-of-iridium-complexes-with-high-electron-mobility
#17
Hua-Bo Han, Zheng-Guang Wu, Zhi-Ping Yan, Yue Zhao, You-Xuan Zheng
Aiming to balance the injection and transport of electrons and holes, nitrogen heterocycle and 1,3,4-oxadiazole derivatives were introduced in iridium(iii) complexes to obtain organic light-emitting diodes (OLEDs) with high performances. Thus, two novel Ir(iii) complexes (Ir(tfmphpm)2(pop) and Ir(tfmppm)2(pop)) with green emissions using 2-(3,5-bis(trifluoromethyl)phenyl)pyrimidine (tfmphpm) and 2-(2,6-bis(trifluoromethyl)pyridin-4-yl)pyrimidine (tfmppm) as cyclometalating ligands, and 2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenol (pop) as an ancillary ligand were synthesized...
November 27, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30408413/combination-responsive-moo-3-x-hybridized-hyaluronic-acid-hollow-nanospheres-for-cancer-phototheranostics
#18
Yuan-Yuan Wang, Wen-Long Wang, Xing-Can Shen, Bo Zhou, Ting Chen, Zhengxi Guo, Chang-Chun Wen, Bang-Ping Jiang, Hong Liang
It is of extreme importance to reduce side effects resulted from the nonspecific uptake of phototherapeutic agents by normal tissues. Currently, single responsive strategy still cannot entirely satisfy the requirements of practical applications. In this study, we developed one kind of combination-responsive phototherapeutic nanoplatforms, where oxygen deficient molybdenum oxide (MoO3-x ) hybridized hyaluronic acid (HA) hollow nanospheres, namely MoO3-x @HA HNSs, were constructed via a facile one-step method...
November 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30398279/a-morphological-enzymatic-and-metabolic-approach-to-elucidate-apoptotic-like-cell-death-in-fungi-exposed-to-h-and-%C3%AE-molybdenum-trioxide-nanoparticles
#19
Clemencia Chaves-Lopez, Hang N Nguyen, Rodrigo C Oliveira, Enrico T Nadres, Antonello Paparella, Debora F Rodrigues
The present study compares for the first time the effects of h-MoO3 and α-MoO3 against two fungal strains: Aspergillus niger and Aspergillus flavus. The h-MoO3 nanoparticles were more toxic to both fungi than α-MoO3. The toxic effects of h-MoO3 were more pronounced toward A. flavus, which presented a growth inhibition of 67.4% at 200 mg L-1. The presence of the nanoparticles affected drastically the hyphae morphology by triggering nuclear condensation and compromising the hyphae membrane. Further analysis of the volatile organic compounds (VOCs) produced by both fungi in the presence of the nanomaterials indicated important metabolic changes related to programmed cell death...
November 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/30366321/impacts-of-molybdenum-nickel-and-lithium-oxide-nanomaterials-on-soil-activity-and-microbial-community-structure
#20
Helena Avila-Arias, Loring F Nies, Marianne Bischoff Gray, Ronald F Turco
The nano forms of the metals molybdenum oxide (MoO3 ), nickel oxide (NiO) and lithium oxide (Li2 O) are finding wide application in advanced technologies including batteries and fuel cells. We evaluated soil responses to nanoMoO3 , nanoNiO, and nanoLi2 O as some environmental release of the materials, either directly or following the land application of biosolids, is expected. Using Drummer soil (Fine-silty, mixed, superactive, mesic Typic Endoaquolls), we evaluated the impacts of the three nanometals on soil gas (N2 O, CH4 , and CO2 ) emissions, enzyme activities (β-glucosidase and urease), and microbial community structure (bacterial, archaeal, and eukaryal) in a 60 day microcosms incubation...
October 18, 2018: Science of the Total Environment
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