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Kuan Wu, Jing Zhan, Gang Xu, Chen Zhang, Dengyu Pan, Minghong Wu
MoO3 is a promising anode material for energy storage, but its electrochemical performance is still unsatisfactory. Herein, α-MoO3 nanosheets vertically grown on activated carbon fiber cloth as superior anode materials for Li- and Na-ion batteries were achieved by the method of controlled preparation. For Li-ion batteries, the resulting MoO3 array electrodes exhibit a high discharge capacity of 4.48 mA h cm-2 (1780 mA h g-1) at 0.1 mA cm-2 and outstanding cycling stability at 0.5 mA cm-2 (94% capacity retention after 200 cycles)...
August 14, 2018: Nanoscale
Guangxue Yang, Xueyao Zhang, Honglei Yang, Yu Long, Jiantai Ma
The mesoporous silicoaluminophosphate SAPO-11 materials were synthesized by using the green and low-cost sucrose as template. The SAPO-11 were characterized by SEM, TEM, N2 physisorption and FT-IR. Sucrose was incorporated into the crystal structure of SAPO-11 crystals to form secondary mesoporosity. Meanwhile, the mesoporous MoVI /SAPO-11 samples with different MoO3 crystalline phases were synthesized. In addition, the pre-prepared optimal catalyst (with 3.6% molybdenum mass content) showed significantly high yield and durability for oxidative desulfurization (ODS)...
July 19, 2018: Journal of Colloid and Interface Science
Tim Herdt, Michael Bruns, Jörg J Schneider
Molybdenum(vi) oxide (MoO3) nanorod arrays were synthesized employing a template-assisted method. A polycarbonate membrane as a template was vacuum infiltrated with an aqueous solution of ammonium heptamolybdate. Template removal by oxygen plasma etching and calcination leads to the formation of highly crystalline 3D MoO3 nanorod arrays as a negative replica of the template. By applying sucrose as the carbon precursor, the mantling of the MoO3 nanorods with a thin carbon coating is obtained. Simultaneously, the direct and binder-free contact between the 3D MoOx nanorod arrays and the current collector resulting from the carbon coating could be achieved and leads to high capacities of up to 1376, 783, 856, 804 and 324 mA h g-1 for cycles 1, 2, 20, 50 and 200 as well as a coulombic efficiency of 99% for such 3D MoOx/C composite electrodes...
July 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xin Qi, Yuan-Chih Lo, Yifan Zhao, Liyang Xuan, Hao-Chun Ting, Ken-Tsung Wong, Mostafizur Rahaman, Zhijian Chen, Lixin Xiao, Bo Qu
Two novel small molecules DTRDTQX and DTIDTQX , based on ditolylaminothienyl group as donor moiety and quinoxaline as middle acceptor moiety with different terminal acceptor groups were synthesized and characterized in this work. In order to study the photovoltaic properties of DTRDTQX and DTIDTQX , bulk-heterojunction solar cells with the configuration of FTO/c-TiO2 / DTRDTQX (or DTIDTQX ):C70 /MoO3 /Ag were fabricated, in which DTRDTQX and DTIDTQX acted as the donors and neat C70 as the acceptor. When the weight ratio of DTRDTQX :C70 reached 1:2 and the active layer was annealed at 100°C, the optimal device was realized with the power conversion efficiency (PCE) of 1...
2018: Frontiers in Chemistry
Junli Zhang, Jiecai Fu, Fangyi Shi, Yong Peng, Mingsu Si, Luigi Cavallo, Zhen Cao
Atomic layered two-dimensional (2D) materials have become fascinating research topics due to their intriguing performances, but the limitation of nonmagnetic properties hinders their further applications. Developing versatile strategies endowing 2D materials with ferromagnetism is one of the main trends in current research studies. Herein, a hydrogen plasma strategy is introduced to dope hydrogen (H) atoms into the prototypical layered α-MoO3 nanosheets, by which ferromagnetic and exchange bias (EB) effects can be induced by H atom doping into α-MoO3 to form Hx MoO3 ...
August 7, 2018: Nanoscale
Shinya Yamasaki, Saori Kurita, Asumi Ochiai, Miya Hashimoto, Keisuke Sueki, Satoshi Utsunomiya
In order to achieve the highly efficient 99m Tc production from 100 MoO3 by the 100 Mo(n, 2n)99 Mo reaction, we have developed a new protocol to synthesize nano-sized Mo particles, of which the size was controlled by the inner space of the liposomes. Calcium and molybdate ions were encapsulated into ∼100 nm size liposomes. The liposome suspensions were then mixed and heated to promote the membrane fusion. As a result, the insoluble CaMoO4 nanoparticles precipitated inside the liposomes. The median particle diameter of 168 nm and average diameter of 169 ± 56 nm (n = 109) were obtained from an SEM image, and the particles have a powellite-structure...
July 4, 2018: Journal of Colloid and Interface Science
Jihan Zhou, Matthew Taylor, Georgian A Melinte, Ashwin J Shahani, Chamila C Dharmawardhana, Hendrik Heinz, Peter W Voorhees, John H Perepezko, Karen Bustillo, Peter Ercius, Jianwei Miao
We report quantitative characterization of the high temperature oxidation process by using electron tomography and energy-dispersive X-ray spectroscopy. As a proof of principle, we performed 3D imaging of the oxidation layer of a model system (Mo3 Si) at nanoscale resolution with elemental specificity and probed the oxidation kinetics as a function of the oxidation time and the elevated temperature. Our tomographic reconstructions provide detailed 3D structural information of the surface oxidation layer of the Mo3 Si system, revealing the evolution of oxidation behavior of Mo3 Si from early stage to mature stage...
July 6, 2018: Scientific Reports
Sukgyun Cha, Changsoon Kim
It is demonstrated that a stamp composed of a poly(dimethylsiloxane) (PDMS) bulk and perfluoropolyether (PFPE) coating fabricated by a simple dip-coating method has the following properties that are ideal for the transfer patterning of various materials. Deposited by a condensation reaction between PDMS and PFPE molecules as well as the adjacent PFPE molecules, the PFPE coating has a strong adhesion to the PDMS surface and strong internal cohesion, while providing a low energy surface. Furthermore, it is found to function as a bidirectional diffusion barrier: it effectively prevents organic small molecules deposited on the stamp from being absorbed into free volumes of PDMS; it also prevents PDMS oligomers from migrating onto the layer to be transferred, thereby avoiding the contamination of that layer...
July 18, 2018: ACS Applied Materials & Interfaces
Sateesh Bandaru, Govindarajan Saranya, Niall J English, Chiyung Yam, Mingyang Chen
First-principles calculations were carried out to understand how anionic isovalent-atom doping affects the electronic structures and optical properties of α-MoO3 . The effects of the sulphur and selenium doping at the three unique oxygen sites (Ot , Oa , and Ot ) of α-MoO3 were examined. We found that the valence p orbitals of Sulphur/Selenium dopant atoms give rise to impurity bands above the valence band maximum in the band structure of α-MoO3 . The number of impurity bands in the doped material depends on the specific doping sites and the local chemical environment of the dopants in MoO3 ...
July 4, 2018: Scientific Reports
Min Wang, Patrick Simon, Liming Lu, Alexander A Sobol, Jian Wang, Songming Wan, Jinglin You
The quantitative distribution of different species ( Q i jklm and H i jklmno ) in binary potassium molybdate melts has been investigated by in situ high temperature Raman spectroscopy in conjunction with quantum chemistry (QC) ab initio calculations. The symmetric stretching vibrational wavenumbers of molybdenum nonbridging oxygen bonds in high wavenumber range and their respectively corresponding Raman scattering cross sections were determined and analyzed. Deconvolution of the stretching bands of molybdenum nonbridging oxygen bonds of molten Raman spectra by using the Voigt function was carried out...
July 10, 2018: Analytical Chemistry
Sanmu Xie, Daxian Cao, Yiyi She, Hongkang Wang, Jian-Wen Shi, Micheal K H Leung, Chunming Niu
Atomic layer deposition (ALD) of TiO2 shells on MoO3 nanobelts (denote as TiO2@MoO3) is realized using a home-made ALD system, which allows a controllable hydrolysis reaction of TiCl4-H2O on an atomic scale. When used as an anode material for lithium ion batteries, the TiO2@MoO3 electrode demonstrates much enhanced lithium storage performance including higher specific capacity, better cycling stability and rate capability.
July 10, 2018: Chemical Communications: Chem Comm
E Lopes, S Piçarra, P L Almeida, H de Lencastre, M Aires-de-Sousa
Multidrug-resistant bacteria pose a major threat to effective antibiotics and alternatives to fight multidrug-resistant pathogens are needed. We synthetized molybdenum oxide (MoO3) nanoparticles (NP) and determined their antibacterial activity against 39 isolates: (i) eight Staphylococcus aureus, including representatives of methicillin-resistant S. aureus epidemic clones; (ii) six enterococci, including vancomycin-resistant isolates; and (iii) 25 Gram-negative isolates (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Acinetobacter baumannii, Enterobacter cloacae), including extended spectrum beta-lactamases and carbapenemases producers...
June 25, 2018: Journal of Medical Microbiology
Enza Fazio, Antonio Speciale, Salvatore Spadaro, Martina Bonsignore, Francesco Cimino, Mariateresa Cristani, Domenico Trombetta, Antonella Saija, Fortunato Neri
Tailored colloids of uniformly sized and engineered molybdenum oxide nanoparticles were produced, for the first time, by pulsed laser ablation in water. This green technique ensures the formation of contaminant-free nanostructures and the absence of by-products, very useful issues in biological applications. A selective tuning of MoO chemical bonding configurations and a suitable control of nanoparticles size distributions were achieved during the ablation processes by varying the water temperature and by applying an external electric field...
June 18, 2018: Colloids and Surfaces. B, Biointerfaces
S M Shugurov, A I Panin, S I Lopatin
RATIONALE: CeO2 -WO3 and CeO2 -MoO3 catalysts have shown excellent performance in the selective reduction of NOx by ammonia (NH3 -selective catalytic reduction) over a wide temperature range. Strong interaction between CeO2 and WO3 or MoO3 might be the dominant reason for the high activity of these mixed oxides. Studies of ceria-containing gaseous salts involve considerable experimental difficulties, since the transition of such salts to vapor requires high temperatures. To predict the possibility of the existence of gaseous associates formed by cerium and molybdenum (tungsten) oxides it is important to know their thermodynamic characteristics...
June 21, 2018: Rapid Communications in Mass Spectrometry: RCM
Chunyan Yang, Yingying Sun, Xinjie Li, Cheng Li, Junfeng Tong, Jianfeng Li, Peng Zhang, Yangjun Xia
It has been reported that the performance of bulk heterojunction organic solar cells can be improved by incorporation of nano-heterostructures of metals, semiconductors, and dielectric materials in the active layer. In this manuscript, CdS or Sb2 S3 nanocrystals were in situ generated inside the poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid (P3HT:PC61 BM) system by randomly mixing P3HT and PC61 BM in the presence of cadmium or antimony xanthate precursor. Hybrid solar cells (HSCs) with the configurations of tin-doped indium oxide substrate (ITO)/CdS interface layer/P3HT:PC61 BM: x wt...
June 20, 2018: Nanoscale Research Letters
Yasutaka Kuwahara, Yukihiro Yoshimura, Kohei Haematsu, Hiromi Yamashita
Harvesting solar light to boost commercially important organic synthesis still remains a challenge. Coupling of conventional noble metal catalysts with plasmonic oxide materials which exhibit intense plasmon absorption in the visible light region is a promising option for efficient solar energy utilization in catalysis. Herein, we for the first time demonstrate that plasmonic hydrogen molybdenum bronze coupled with Pt nanoparticles (Pt/H x MoO3- y ) shows a high catalytic performance in the deoxygenation of sulfoxides with 1 atm of H2 at room temperature, with dramatic activity enhancement under visible light irradiation relative to dark conditions...
July 25, 2018: Journal of the American Chemical Society
Chenli Hu, Haibo Shu, Zihong Shen, Tianfeng Zhao, Pei Liang, Xiaoshuang Chen
Two-dimensional (2D) tin disulfide (SnS2) is a promising anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity. The main challenges associated with the SnS2 electrodes are the poor cycling stability and low rate capability due to structural degradation in the discharge/charge process. Here, a facile two-step synthesis method is developed to fabricate hierarchical MoO3/SnS2 core-shell nanowires, where ultrathin SnS2 nanosheets are vertically anchored on MoO3 nanobelts to induce a heterointerface...
June 27, 2018: Physical Chemistry Chemical Physics: PCCP
Cheng Zhang, Pushpa R Pudasaini, Akinola D Oyedele, Anton V Ievlev, Liubin Xu, Amanda V Haglund, Joo Hyon Noh, Anthony T Wong, Kai Xiao, Thomas Z Ward, David G Mandrus, Haixuan Xu, Olga S Ovchinnikova, Philip D Rack
The formation of an electric double layer in ionic liquid (IL) can electrostatically induce charge carriers and/or intercalate ions in and out of the lattice which can trigger a large change of the electronic, optical, and magnetic properties of materials and even modify the crystal structure. We present a systematic study of ionic liquid gating of exfoliated 2D molybdenum trioxide (MoO3 ) devices and correlate the resultant electrical properties to the electrochemical doping via ion migration during the IL biasing process...
July 5, 2018: ACS Applied Materials & Interfaces
Masanori Horie, Kaori Shimizu, Yosuke Tabei
Metal oxide nanoparticles have an industrial value, although their harmful effects are also known. Induction of respiratory inflammation through their inhalation is a serious indicator of their toxicity. Although the phenomenon of metal ion release is involved in the induction of inflammation, all metal ions are not necessarily toxic. However, currently, no particular index to evaluate cytotoxicity caused by nanoparticles exists. An index based on biological response is critical. In the present study, we examined the gene expression-based index for nanoparticles-derived cytotoxicity...
June 8, 2018: Toxicology Mechanisms and Methods
Hao Li, Qun Xu, Xuzhe Wang, Wei Liu
Surface-enhanced Raman spectroscopy (SERS) based on plasmonic semiconductive material has been proved to be an efficient tool to detect trace of substances, while the relatively weak plasmon resonance compared with noble metal materials restricts its practical application. Herein, for the first time a facile method to fabricate amorphous Hx MoO3 quantum dots with tunable plasmon resonance is developed by a controlled oxidization route. The as-prepared amorphous Hx MoO3 quantum dots show tunable plasmon resonance in the region of visible and near-infrared light...
July 2018: Small
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