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Zhendong Zhang, Jiachang Zhao, Meilan Xu, Hongxia Wang, Yanmei Gong, Jingli Xu
A novel Sb2S3/MoS2 heterostructure in which Sb2S3 nanorods are coated with MoS2 nanosheets to form core-shell structure has been fabricated via a facile two-step hydrothermal process. The Sb2S3/MoS2 heterostructure utilized as anode of sodium-ion batteries (SIBs) shows higher capacity, superior rate capability and better cycling performance compared with individual Sb2S3 nanorods and MoS2 nanosheets. Specifically, the Sb2S3/MoS2 electrode shows an initial reversible capacity of 701 mAh g-1 at the current density of 100 mA g-1, which is remained 80...
May 18, 2018: Nanotechnology
Linqiu Li, Run Long, Oleg V Prezhdo
Two-dimensional transition metal dichalcogenides (TMDs) have drawn strong attention due to their unique properties and diverse applications. However, TMD performance depends strongly on material quality and defect morphology. Experiments show that samples grown by chemical vapor deposition (CVD) outperform those obtained by physical vapor deposition (PVD). Experiments also show that CVD samples exhibit vacancy defects, while antisite defects are frequently observed in PVD samples. Our time-domain ab initio study demonstrates that both antisites and vacancies accelerate trapping and nonradiative recombination of charge carriers, but antisites are much more detrimental than vacancies...
May 18, 2018: Nano Letters
Kun Guo, Yi Ding, Jun Luo, Zhixin Yu
First-row transition metal based thiospinels are prepared via a one-pot versatile strategy and for the first time investigated as hydrodesulfurization (HDS) catalysts. XRD, TEM and XPS analysis confirm that these thiospinels consist of agglomerated nanoparticles (NPs) and contain multivalent metal cations. Among the sulfides synthesized at 230 °C, NiCo2S4 presents the highest thiophene conversion. This high intrinsic activity is found to be correlated with the normal spinel structure with Ni cations located on the tetrahedral sites and Co cations on the octahedral sites...
May 17, 2018: ACS Applied Materials & Interfaces
Fazil Panhwar, Zhongrong Chen, S M Chapal Hossain, Meng Wang, Zeeshan Haider, Kashan Memon, Pengpeng Chen, Gang Zhao
Two-dimensional (2D) graphene oxide (GO) and molybdenum disulfide (MoS2) nanosheets (NSs) have been widely used as photothermal agents and as potential carriers of antitumor drugs. Their spatial thermal effects have been extensively explored for use at physiological and hyperthermic temperatures (37 to 46 °C). Furthermore, the modulation of the spatial thermal distributions with these NSs may have even more profound applications in the microstructural control of biomaterials at cryogenic temperatures (-196 to 37 °C)...
May 17, 2018: Nanoscale
Qisheng Wang, Yao Wen, Kaiming Cai, Ruiqing Cheng, Lei Yin, Yu Zhang, Jie Li, Zhenxing Wang, Feng Wang, Fengmei Wang, Tofik Ahmed Shifa, Chao Jiang, Hyunsoo Yang, Jun He
Optoelectronic devices for information storage and processing are at the heart of optical communication technology due to their significant applications in optical recording and computing. The infrared radiations of 850, 1310, and 1550 nm with low energy dissipation in optical fibers are typical optical communication wavebands. However, optoelectronic devices that could convert and store the infrared data into electrical signals, thereby enabling optical data communications, have not yet been realized. We report an infrared memory device using MoS2 /PbS van der Waals heterostructures, in which the infrared pulse intrigues a persistent resistance state that hardly relaxes within our experimental time scales (more than 104 s)...
April 2018: Science Advances
Chaitali Singhal, Manika Khanuja, Nahid Chaudhary, C S Pundir, Jagriti Narang
Development of platforms for a reliable, rapid, sensitive and selective detection of chikungunya virus (CHIGV) is the need of the hour in developing countries. To the best of our knowledge, there are no reports available for the electrochemical detection of CHIGVDNA. Therefore, we aim at developing a biosensor based on molybdenum disulphide nanosheets (MoS2 NSs) for the point-of-care diagnosis of CHIGV. Briefly, MoS2 NSs were synthesized by chemical route and characterized using scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, Raman spectroscopy and X-Ray Diffraction...
May 16, 2018: Scientific Reports
Sarvottam K Jha, Reetu Kumari, Shubham Choudhary, Puspendu Guha, P V Satyam, Brajesh S Yadav, Zainab Naqvi, S S Kushvaha, R K Ratnesh, M S Mehata, Aditya Jain, Amrish K Panwar, Fouran Singh, Pawan K Tyagi
In this paper, we have reported a simple and efficient method for the synthesis of uniform, highly conducting single or few layer molybdenum disulfide (MoS2) on large scale. Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HRTEM) have been used for the confirmation of mono or few layered nature of the as-synthesized MoS2 sheets. X-ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction (XRD) and Raman Spectroscopy have also been used to study the elemental, phase, and molecular composition of the sample...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Yadong Yu, Na Wu, Gang Peng, Tao Li, Ling Jiang, He Huang
Convenient and sensitive methods for the detection of α-ketoglutarate (α-KG) will be beneficial for biomedical diagnosis and microbial fermentation industry. In this work, reduced MoS2 nanoparticles (rMNs) were prepared by ultrasonication and electrochemical reduction. The rMNs were then decorated with gold nanoparticles (Aunano) to fabricate rMNs-Aunano nanocomposite. The glass carbon electrode modified with rMNs-Aunano nanocomposite (rMNs-Aunano-GCE) showed excellent electro-catalytic oxidation toward NADH with a satisfied reproducibility and exhibited linear response in the range of 38...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Jin-Seob Park, Yongju Jung, Seok Kim
Graphene nanosheet (GNS)/Molybdenum disulfide (MoS2)-sulfur composites were prepared by an In Situ solution-phase synthesis method. The practical implementation of lithium sulfur battery has not been realized by low discharge capacity and fast capacity decay during cycling owing to dissolution of lithium polysulfide into the electrolyte. In this work, we found that the GNS/MoS2 composites could mitigate the polysulfide dissolution and enhance the cycling stability via the MoS2 interaction. Electrochemical performances of prepared composites were evaluated in lithium batteries by galvanostatic cycling and cyclic voltammetry...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Yibo Zhu, Yijun Li, Ghidewon Arefe, Robert A Burke, Cheng Tan, Yufeng Hao, Xiaochi Liu, Xue Liu, Won Jong Yoo, Madan Dubey, Qiao Lin, James C Hone
Two-dimensional transition metal dichalcogenides (TMDs) are unique candidates for development of next-generation electronic devices. However, the large contact resistance between metal and the monolayer TMDs have significantly limited the devices' performance. Also, integration of ultrathin high-k dielectric layer with TMD remains difficult due to the lack of dangling bonds on the surface of TMDs. We present monolayer molybdenum disulfide field effect transistors with bottom local gates consisting of monolayer graphene...
May 16, 2018: Nano Letters
Yongliang Shi, Boao Song, Reza Shahbazian-Yassar, Jin Zhao, Wissam A Saidi
In nanometer clusters (NCs) each atom counts. It is the specific arrangement of these atoms that determines the unique size-dependent functionalities of the NCs and hence their applications. Here we employ a self-consistent, combined theoretical and experimental approach to determine atom-by-atom the structures of supported Pt NCs on MoS2. The atomic structures are predicted using a genetic algorithm utilizing atomistic force fields and density functional theory, which are then validated using aberration-corrected scanning transmission electron microscopy...
May 16, 2018: Journal of Physical Chemistry Letters
Christian Dahl-Petersen, Manuel Sarić, Michael Brorson, Poul Georg Moses, Jan Rossmeisl, Jeppe V Lauritsen, Stig Helveg
Layered transition metal dichalcogenides have distinct physicochemical properties at their edge-terminations. The production of an abundant density of edge structures is, however, impeded by the excess surface energy of edges compared to basal planes and would benefit from insight into the atomic growth mechanisms. Here, we show that edge-terminated MoS2 nanostructures can form during sulfidation of MoO2 nanocrystals by using in situ transmission electron microscopy (TEM). Time-resolved TEM image series reveal that the MoO2 surface can sulfide by inward progression of MoO2 (20-2):MoS2 (002) interfaces resulting in upright-oriented and edge-exposing MoS2 sheets...
May 16, 2018: ACS Nano
Zhongheng Fu, Dominik Legut, Timothy C Germann, Chen Si, Shiyu Du, Joseph S Francisco, Ruifeng Zhang
Two-dimensional transition metal carbides (MXenes) exhibit excellent thermodynamic stability, mechanical strength and flexibility, which make them promising candidates in flexible devices and reinforcements in nanocomposites. However, the dynamic stability may intrinsically determine the preferred adsorption sites of functional groups in MXenes and lead to premature failure under finite strain before approaching the elastic limits. It is found interestingly that different adsorption sites of the functional groups correspond to the different phonon stabilities and adsorption energies of MXenes, which can be attributed to different hybridization characteristics between the metal-d and O-pz states and delocalized electron behaviors around the metal atoms...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
Shanshan Wang, Hidetaka Sawada, Xiaoyu Han, Si Zhou, Sha Li, Zheng Xiao Guo, Angus I Kirkland, Jamie H Warner
We show that Pt nanoclusters preferentially nucleate along the grain boundaries (GBs) in polycrystalline MoS2 monolayer films, with dislocations acting as the seed site. Atomic resolution studies by aberration-corrected annular dark-field scanning transmission electron microscopy reveal periodic spacing of Pt nanoclusters with dependence on GB tilt angles and random spacings for the antiphase boundaries ( i.e., 60°). Individual Pt atoms are imaged within the dislocation core sections of the GB region, with various positions observed, including both the substitutional sites of Mo and the hollow center of the octahedral ring...
May 15, 2018: ACS Nano
Ruben Canton-Vitoria, Lorenzo Vallan, Esteban Urriolabeitia, Ana Benito, Wolfgang Maser, Nikos Tagmatarchis
We report on the preparation, characterization and photophysical and electrocatalytic properties of carbon dots (CDs)/MoS2 ensembles. Based on electrostatic interactions, ammonium functionalized MoS2, prepared upon reaction of 1,2-dithiolane tert-butyl carbamate with MoS2 followed by acidic deprotection, was coupled with CDs bearing multiple carboxylates on their periphery as derived upon microwave-assisted polycondensation of citric acid and ethylenediamine followed by alkaline treatment. Insights into electronic interactions between the two species within CDs/MoS2 emanated from absorption and photoluminescence titration assays...
May 15, 2018: Chemistry: a European Journal
E V Calman, M M Fogler, L V Butov, S Hu, A Mishchenko, A K Geim
Indirect excitons (IXs) are explored both for studying quantum Bose gases in semiconductor materials and for the development of excitonic devices. IXs were extensively studied in III-V and II-VI semiconductor heterostructures where IX range of existence has been limited to low temperatures. Here, we present the observation of IXs at room temperature in van der Waals transition metal dichalcogenide (TMD) heterostructures. This is achieved in TMD heterostructures based on monolayers of MoS2 separated by atomically thin hexagonal boron nitride...
May 14, 2018: Nature Communications
Nan-Fu Chiu, Ting-Li Lin
The development of functionalized molybdenum disulfide (MoS2 ) has led to a new trend in the biosensing field, owing to its high sensitivity and bio-affinity characteristics with regards to the simple synthesis of carboxyl-functionalized MoS2 nanocomposites. In this study, we used monochloroacetic acid (MCA) to successfully modify carboxyl-MoS2 . The efficiency of this MCA modification method showed a higher -COOH group content of 30.1%, mainly due to chlorine atoms occupying the MoS2 sulfur vacancy to allow for the formation of a strong bonding effect...
August 1, 2018: Talanta
Xiujuan Qiao, Kunxia Li, Jinqiong Xu, Ni Cheng, Qinglin Sheng, Wei Cao, Tianli Yue, Jianbin Zheng
Cardiac troponin I (cTnI) is a specific and sensitive biomarker for the early diagnosis of acute myocardial infarction and for the subsequent clinical treatments. In this work, novel electrochemical sensing platform for sensing of cTnI based on aptamer-MoS2 nanoconjugates was proposed. For comparison, core-shell Au@SiO2 @Au nanoparticles were also used for sensing of cTnI. The sensing schemes and electrochemical responses of the proposed sensors were investigated by electrochemical impedance spectroscopy (EIS) in 5...
May 4, 2018: Biosensors & Bioelectronics
Yun-Xiao Zhang, Kui Li, Yu-Xiang Yu, Wei-De Zhang
This work reports effective photocatalysts which are composed of carbon nitride (CN), carbon nanotubes (CNTs), MoS2 and NiS, for hydrogen evolution aiming at energy crises and environmental pollutions. The morphologies and optical properties of the photocatalysts were carefully characterized and their photocatalytic performance towards water reduction was studied afterwards. MoS2 and NiS exhibit a significant synergistic effect working as co-catalysts. Compared to MoS2 /CN nanohybrid, carbon nanotubes and NiS improved the absorption of visible light and the separation of charge carriers effectively...
May 3, 2018: Journal of Colloid and Interface Science
Huayu Huang, Mingxia Wang, Yang Wang, Xinli Li, Zhiying Niu, Xingyu Wang, Jinxi Song
Molybdenum disulfide (MoS2 ) was used as an electrically conductive skeleton and functionalized with an ionic liquid and gold/silver nanorods. The resulting composite was characterized by scanning electron microscopy, transmission electron microscopy and UV-vis spectroscopy. The composites were used to modify a glassy carbon electrode (GCE) to obtain a sensor for 2,4-dichlorophenol (2,4-DCP). The results show that the oxidation power and electrocatalytic activity of the modified GCE towards 2,4-DCP are enhanced compared to a bare GCE and other modified GCEs...
May 10, 2018: Mikrochimica Acta
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