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Nataliia S Vorobeva, Alexey Lipatov, Dmitry S Muratov, Alexander Sinitskii
We report on the chemical vapor deposition synthesis of MoO2 nanoplatelets by sublimation of MoO3 and its reduction in a hydrogen atmosphere at 750 °C. When grown on Si/SiO2 substrates, the platelets primarily assume a rhomboidal shape and have thicknesses ranging from several to tens of nm. The morphology of MoO2 crystals was found to depend on the chemical nature of substrates. MoO2 platelets on Si/SiO2 were characterized by a number of microscopic and spectroscopic techniques, and the electrical measurements revealed the metallic nature of their conductivity averaging at 2400 ± 1000 S cm-1 ...
October 12, 2018: Nanotechnology
Chunyang Sheng, Sungwook Hong, Aravind Krishnamoorthy, Rajiv K Kalia, Aiichiro Nakano, Fuyuki Shimojo, Priya Vashishta
Layered transition metal dichalcogenide (TMDC) materials have received great attention because of their remarkable electronic, optical, and chemical properties. Among typical TMDC family members, monolayer MoS2 has been considered a next-generation semiconducting material, primarily due to higher carrier mobility and larger band gap. The key enabler to bring such a promising MoS2 layer into mass production is chemical vapor deposition (CVD). During CVD synthesis, gas-phase sulfidation of MoO3 is a key elementary reaction, forming MoS2 layers on a target substrate...
October 8, 2018: Journal of Physical Chemistry Letters
Atena Naeimi, Moones Honarmand, Asmaa Sedri
MoO3 nanoparticles were obtained using Sesbania sesban. Novel Schiff base ligand and its nanocomplex of copper were synthesized under ultrasonic irradiation. First MoO3 /Copper Schiff base complex nanocomposite (NMCS) based on this natural plant was prepared and characterized by TEM, SEM, AFM, FT-IR, TGA, EDAX and elemental analysis. Then atom-efficient and selective oxidation of alcohols using hydrogen peroxide catalyzed by NMCS bio-nanocomposite under ultrasonic irradiation was reported. Structurally diverse set of alcohols was transformed into desired aldehyde and ketone products with high conversion and excellent selectivity under solvent free conditions...
January 2019: Ultrasonics Sonochemistry
Huimin Zhou, Xin Xia, Pengfei Lv, Jin Zhang, Xuebin Hou, Min Zhao, Kelong Ao, Di Wang, Muhammad Naeem, Keyu Lu, Hui Qiao, Malgorzata Zimniewska, Qufu Wei
Integrating layered nanostructured MoS2 with superior structural stable TiO2 backbone to construct reciprocal MoS2-TiO2 based nanocomposites has been proved to be an effective strategy. Herein, 1T phase MoS2 nanograins doped C@TiO2/MoO3 composite nanofibers were achieved by partially sulfurizing MoOx/TiO2 precursors. Controlling the suitable preoxidation temperature before severe thermolysis of PVP, the TiO2/MoOx precursors appeared as array embedded into polymer induced by chemical coordination of Mo source and pyrrolidyl group of PVP...
October 4, 2018: ChemSusChem
Zongyou Yin, Moshe Tordjman, Youngtack Lee, Alon Vardi, Rafi Kalish, Jesús A Del Alamo
High electron affinity transition-metal oxides (TMOs) have gained a central role in two-dimensional (2D) electronics by enabling unprecedented surface charge doping efficiency in numerous exotic 2D solid-state semiconductors. Among them, diamond-based 2D electronics are entering a new era by using TMOs as surface acceptors instead of previous molecular-like unstable acceptors. Similarly, surface-doped diamond with TMOs has recently yielded record sheet hole concentrations (2 × 1014 cm-2 ) and launched the quest for its implementation in microelectronic devices...
September 2018: Science Advances
Nikolay Kosinov, Evgeny A Uslamin, Ferdy J A G Coumans, Alexandra S G Wijpkema, Roderigh Y Rohling, Emiel J M Hensen
Surface carbon (coke, carbonaceous deposits) is an integral aspect of methane dehydroaromatization catalyzed by Mo/zeolites. We investigated the evolution of surface carbon species from the beginning of the induction period until the complete catalyst deactivation by the pulse reaction technique, TGA, 13 C NMR, TEM, and XPS. Isotope labeling was performed to confirm the catalytic role of confined carbon species during MDA. It was found that "hard" and "soft" coke distinction is mainly related to the location of coke species inside the pores and on the external surface, respectively...
September 7, 2018: ACS Catalysis
Lei Wang, Xiaohong Ji, Ting Wang, Qinyuan Zhang
Electrically driven red emission from MoS2-MoO2-MoO3 (MS-MO) hybrid-based metal-semiconductor-metal (MSM) devices is first reported. MoO3 belts with high crystal quality and sufficient size are synthesized by thermal deposition. A layer of MS-MO hybrid is then produced on the belt surface to form MoO3/MS-MO core-shell by sulfurization. The devices exhibit unique electrical properties, nonlinear I-V curve and electric hysteresis characteristics at high applied biases (>2.4 V), where MS-MO hybrids act as electron transport channels...
September 27, 2018: ACS Applied Materials & Interfaces
Junnan Hao, Jian Zhang, Guanglin Xia, Yajie Liu, Yang Zheng, Wenchao Zhang, Yongbing Tang, Wei Kong Pang, Zaiping Guo
Recently, heterostructures have attracted much attention in widespread research fields. By tailoring the physicochemical properties of the two components, creating heterostructures endows composites with diverse functions due to the synergistic effects and interfacial interaction. Here, a simple in situ localized phase transformation method is proposed to transform the transition-metal oxide electrode materials into heterostructures. Taking molybdenum oxide as an example, quasi-core-shell MoO3 @MoO2 heterostructures were successfully fabricated, which were uniformly anchored on reduced graphene oxide (rGO) for high-rate and highly durable lithium ion storage...
September 28, 2018: ACS Nano
Yaxin Chen, Chao Li, Junxiao Chen, Xingfu Tang
Low-temperature selective catalytic reduction of NO by NH3 (NH3 -SCR) is a promising technology for controlling NO emission from various industrial boilers, but it remains challenging because unavoidable deposition of ammonium bisulfates (ABS) in the stack gases containing both SO2 and H2 O inevitably results in deactivation of catalysts. Here we developed a stable low-temperature NH3 -SCR catalyst by supporting Fe2 O3 cubes on surfaces of MoO3 nanobelts with NH4 + -intercalatable interlayers, which enables Fe2 O3 /MoO3 to spontaneously prevent ABS from depositing on the surfaces...
October 4, 2018: Environmental Science & Technology
Yijin Shu, Ting Chen, Hang Cheong Chan, Lifang Xie, Qingsheng Gao
Hydrogenation of α,β-unsaturated aldehydes to value-added unsaturated alcohols suffers a huge challenge in chemoselectivity. Herein, surface decoration by FeOx is introduced to remarkably improve the selectivity of cinnamyl alcohol (COL) in cinnamaldehyde (CAL) hydrogenation on Pt/MoO3-y. The enhanced acidity on Pt-FeOx interfaces is beneficial for the chemisorption and activation of C=O bonds, promoting selective hydrogenation. The optimal catalysts with defined FeOx decoration afford efficient and chemoselective CAL hydrogenation (sel...
September 19, 2018: Chemistry, An Asian Journal
Taylor A Barnes, Liwen F Wan, Paul R C Kent, David Prendergast
Rechargeable batteries that utilize divalent Mg ions as the charge carrier species can in principle achieve substantially greater volumetric energy densities than conventional Li-ion batteries. One significant impediment to the development of commercially viable Mg-ion batteries is the slow rate of Mg ion diffusion through otherwise promising cathode materials. Accurate prediction of the activation energies associated with this diffusion process using density functional theory (DFT) is especially challenging due to self-interaction errors intrinsic to DFT that lead to over-delocalization of the d-electrons...
October 3, 2018: Physical Chemistry Chemical Physics: PCCP
Matteo Ciprian, Peng Xu, Somboon Chaemchuen, Rong Tu, Serge Zhuiykov, Philippe M Heynderickx, Francis Verpoort
Toxic wastewaters from the textile industry have made its way into rivers and other waterways, posing a serious health treat on both human and wildlife. Herein, this data set presents the potential use of MoO3 nanoparticles supported on ZIF-8 in the photodegradation of a cationic dye molecule. The data presented in this article report a concise description of experimental conditions for the spray-dried ZIF-8 synthesis and subsequent deposition of MoO3 nanoparticles via rotary chemical vapor deposition (RCVD)...
August 2018: Data in Brief
W Xu, X Lu, L N Wang, Z M Shi, S M Lv, M Qian, X H Qu
A biocompatible Ti-12Mo alloy was fabricated by metal injection moulding (MIM) using non-spherical titanium, molybdenum powders and a purposely designed binder. The density, microstructure and tensile properties were characterized. This was followed by a detailed assessment of its in vitro corrosion and biocompatibility performances, compared with that of two commonly used titanium-based materials extra low interstitial (ELI) Ti-6Al-4V and commercially pure (CP) titanium. The MIM-fabricated Ti-12Mo alloy can achieve a wide range of mechanical properties through controlling sintering process...
August 28, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Boyuan Shen, Huanhuan Xie, Lin Gu, Xiao Chen, Yunxiang Bai, Zhenxing Zhu, Fei Wei
Chirality is a significant structural feature for chemistry, biology, physics, and materials science, and especially determines the electrical, mechanical, and optical properties of diverse tubular structures, such as carbon nanotubes (CNTs). To recognize the chirality of nanotubes, templates are introduced as potential tools to obtain crystalline samples with visible chiral fringes under electron microscopes. However, few efforts show optimistic results, and new understanding is desired to control the sample quality with CNT templates...
September 14, 2018: Advanced Materials
Paramasivam Balasubramanian, Muthaiah Annalakshmi, Shen-Ming Chen, Tse-Wei Chen
Present strategy introduce the sonochemical synthesis of molybdenum oxide (MoO3 ) microspheres anchored graphitic carbon nitride (g-C3 N4 ) ultrathin sheets as a novel electrocatalyst for the detection of Furazolidone (FU). TEM results revealed that MoO3 are microspheres with an average size of 2 µM and the g-C3 N4 seems like ultrathin sheets. Owing to their peculiar morphological structure, g-C3 N4 /MoO3 composite modified electrode provided an enriched electroactive surface area (0.3788 cm2 ) and higher heterogeneous electron transfer kinetics (K°eff  = 4...
September 3, 2018: Ultrasonics Sonochemistry
H S Yogananda, R B Basavaraj, G P Darshan, B Daruka Prasad, Ramachandra Naik, S C Sharma, H Nagabhushana
Red colour light emitting Eu3+ ions activated MoO3 nanophosphors (NPs) were prepared through an ultrasound assisted sonochemical method using Aloe Vera (A.V.) gel as a bio-surfactant. Properties like crystal structure, morphology, optical band gap, luminescent properties, radiative parameters of prepared samples and their use in latent fingerprint (LFPs) visualization were reported. Powder X-ray diffraction results revealed the single orthorhombic crystal structure of the prepared samples, which specifies effective substitution of dopant ions...
October 15, 2018: Journal of Colloid and Interface Science
Arun K Nandi, Debasish Mandal, Parimal Routh
The versatile technological applications of molybdenum oxides demand a supreme source for efficient synthesis of various stoichiometric molybdenum oxides. In that prospect, here we are providing a controlled method to synthesize both MoO3 and MoO2 from MoS2 via quantum dot intermediate. Microscopic, spectroscopic and X-ray studies corroborate the formation of orthorhombic α-MoO3 having micro-belt structure and monoclinic MoO2 nanoparticles which self-assemble to hollow-tube. The quantitative investigations of charge storage kinetics reveal that MoO2 exhibits excellent pseudocapacitive response upto 5 mg/cm2 loading mass having 327...
August 28, 2018: Chemistry, An Asian Journal
Xiaoyi Xue, Jianan Zhang, Ibrahim Amiinu Saana, Jian Sun, Qun Xu, Shichun Mu
Activating both the inert basal plane and edge sites of molybdenum-disulphide (MoS2) is a significant yet challenging step in boosting their performance for the hydrogen evolution reaction (HER). In this study, the density functional theory calculation results show that the incorporation of MoO3 fragments leads to a slight out-of-plane distortion of the 1T-MoS2 phase of the resultant O-Mo-S framework, giving rise to a 1T'-MoS2/MoO3 heterostructure, where gap states around the Fermi level allow hydrogen evolution over both its basal plane (Mo-site) and edges (S-sites)...
September 13, 2018: Nanoscale
Asma Sedri, Atena Naeimi, Sayed Zia Mohammadi
Extracted microcrystalline cellulose from Carthamus tinctorius plant was oxidized by sodium metaperiodate and a novel molybdenum schiff base complex was supported on this natural cellulose (MoSMC@MC). Then, micro biopolymer silver/ immobilized molybenum complex on natural cellulose (Ag/MoSMC@MC) was synthesized at the presence of Sesbania sesba plant and charaterized by SEM, FT-IR, TGA, and EDAX. The catalytic efficiency of Ag/MoSMC@MC was exploited as a heterogenous bio-catalyst in the selective oxidation of alcohols...
November 1, 2018: Carbohydrate Polymers
Fahmida Rahman, Taimur Ahmed, Sumeet Walia, Edwin Mayes, Sharath Sriram, Madhu Bhaskaran, Sivacarendran Balendhran
Non-volatile resistive memory devices are theorized to be the most promising pathway towards analog memory and neuromorphic computing. Two-dimensional MoO3 is a versatile planar transition metal oxide, whose properties can be readily tuned, making it anywhere from a wide bandgap semiconductor to a semi-metal. Successful integration of such a planar metal oxide into resistive memory can enable adaptive and low power memory applications. Here, we investigate the non-volatile and reversible resistive switching behaviour of oxygen deficient MoOx in a cross-point metal/insulator/metal (MIM) architecture...
August 24, 2018: Nanoscale
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