Relevant bibliographies by topics / Tungsten Disulfide

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Tungsten Disulfide'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Tungsten Disulfide"

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Irtegov, Yuriy, Vladimir An, Ksenia Machekhina, and Nikolay Lemachko. "Two-Step Synthesis of Tungsten and Molybdenum Disulfides." Key Engineering Materials 685 (February 2016): 511–15. http://dx.doi.org/10.4028/www.scientific.net/kem.685.511.

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Efficient two-step technique of tungsten and molybdenum disulfides obtaining from metal nanopowders produced by EEW and elementary sulphur is described. Tungsten and molybdenum nanopowders surface area dependence on wire length is studied. Features of metal and sulphur combustion process are discussed. It is determined sulphur excess in reagents 15 wt.% results in mono-phase metal disulfide formation with small free sulphur concentration in reaction products.
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Irtegov, Yuriy, Vladimir An, Ksenia Machekhina, and Nikolay Lemachko. "Influence of Copper Nanoparticles on Tribological Properties of Nanolamellar Tungsten Disulfide." Key Engineering Materials 712 (September 2016): 133–36. http://dx.doi.org/10.4028/www.scientific.net/kem.712.133.

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Tribological properties of a composite mixture based on copper nanoparticles and nanolamellar tungsten disulfide powder have been studied. SEM of copper nanoparticles produced by electrical explosion of wires was analyzed. The tribological tests of pure tungsten disulfide and composite WS2-Cu lubricant are performed. Possible mechanism of copper influence to tribological properties of tungsten disulfide was discussed.
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Peng, Ya-Kang, Zi-Yu Cao, Liu-Cheng Chen, Ning Dai, Yan Sun, and Xiao-Jia Chen. "Phonon Anharmonicity of Tungsten Disulfide." Journal of Physical Chemistry C 123, no. 41 (September 26, 2019): 25509–14. http://dx.doi.org/10.1021/acs.jpcc.9b07553.

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An, Vladimir, Yuri Irtegov, and Charles de Izarra. "Study of Tribological Properties of Nanolamellar WS2and MoS2as Additives to Lubricants." Journal of Nanomaterials 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/865839.

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This work was aimed at studying the tribological properties of nanolamellar tungsten and molybdenum disulfides produced from nanosized W and Mo nanopowders by self-propagating high-temperature synthesis. The prepared WS2and MoS2powders were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential thermal analysis (DTA). For tribological tests, oil-based lubricants added with nanolamellar tungsten and molybdenum disulfides were prepared. The tribological tests show that the friction coefficient of the nanolamellar powders is lower than that of commercial powder(μmin=0.024and 0.064, resp.). It is also found that the oil-based lubricants with nanolamellar disulfide additives display higher antifriction and antiwear properties compared to commercial powder.
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Li, Xiao, Jing Liu, Xin Gong, Taiping Qing, Peng Zhang, and Bo Feng. "Synthesis of fluorescent tungsten disulfide by nitrogen atom doping and its application for mercury(ii) detection." Journal of Materials Chemistry C 7, no. 14 (2019): 4096–101. http://dx.doi.org/10.1039/c8tc06233a.

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A facile and eco-friendly approach for synthesizing fluorescent tungsten disulfide nanosheets was developed via nitrogen atom doping using melamine as the nitrogen source. The applicability of this ultraviolet emissive tungsten disulfide as an optical nano probe for mercury(ii) detection was testified.
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Ionescu, Robert, Isaac Ruiz, Zach Favors, Brennan Campbell, Mahesh R. Neupane, Darshana Wickramaratne, Kazi Ahmed, et al. "Two step growth phenomena of molybdenum disulfide–tungsten disulfide heterostructures." Chemical Communications 51, no. 56 (2015): 11213–16. http://dx.doi.org/10.1039/c5cc02837j.

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He, Zhengyu, Wenshuo Xu, Yingqiu Zhou, Xiaochen Wang, Yuewen Sheng, Youmin Rong, Shaoqiang Guo, Junying Zhang, Jason M. Smith, and Jamie H. Warner. "Biexciton Formation in Bilayer Tungsten Disulfide." ACS Nano 10, no. 2 (January 13, 2016): 2176–83. http://dx.doi.org/10.1021/acsnano.5b06678.

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Pisoni, Andrea, Jacim Jacimovic, Richard Gaál, Bálint Náfrádi, Helmuth Berger, Zsolt Révay, and László Forró. "Anisotropic transport properties of tungsten disulfide." Scripta Materialia 114 (March 2016): 48–50. http://dx.doi.org/10.1016/j.scriptamat.2015.11.028.

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Wang, G. X., Steve Bewlay, Jane Yao, H. K. Liu, and S. X. Dou. "Tungsten Disulfide Nanotubes for Lithium Storage." Electrochemical and Solid-State Letters 7, no. 10 (2004): A321. http://dx.doi.org/10.1149/1.1788591.

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Mao, Xingze, Yan Xu, Qixin Xue, Weixiao Wang, and Daqiang Gao. "Ferromagnetism in exfoliated tungsten disulfide nanosheets." Nanoscale Research Letters 8, no. 1 (2013): 430. http://dx.doi.org/10.1186/1556-276x-8-430.

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Dissertations / Theses on the topic "Tungsten Disulfide"

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Moberg, Michael J. "Carbon Fiber and Tungsten Disulfide Nanoscale Architectures for Armor Applications." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/7387.

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The objective of this research was to generate shock-resistant materials based on inorganic fullerene type tungsten disulfide (IF-WS2) and carbon nanocomposite structures for personal protection armor systems. The aim was to develop a new generation of composites that combine the known energy absorbing properties of carbon nanofibers, with the shock absorbing properties reported for IF-WS2 structures. Various methods were explored to generate the desired WS2carbon fiber composite. Experimentation revealed that in situ growth of carbon fibers from a nickel catalyst with tungsten disulfide particulates had to be performed from particular precursors and fabrication conditions to avoid undesirable byproducts that hinder fiber growth. As a result, tungsten oxide was used as tungsten source, nickel as carbon fiber growth catalyst, ethylene as hydrocarbon and fuel rich oxidative conditions for growth, all followed by a sulfurization process. Fabrication of fibers was performed at moderate temperatures (ca. 550 degrees C) with a sulfurization step at 900 degrees C in a tubular furnace. Microstructural characterization of the samples was primarily conducted using X-ray diffraction and electron microscopy. In order to determine more properties of the nanocomposites, the samples were dispersed into an epoxy matrix. Nano-indentation was utilized as a method of determining mechanical properties of the composites while a gas gun was used to determine shock propagation effects. The inclusion of WS2/C nanocomposites into epoxy matrixes showed a significant improvement in modulus and hardness values when compared to bare carbon fiber epoxy composites. WS2/C fiber epoxy nanocomposites preserved their integrity during gas gun tests while samples without WS2 fractured.
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Ussa, Aldana Paula. "Tungsten disulfide nanoparticles as lubricant additives for the automotive industry." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC001/document.

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Les normes environnementales toujours plus sévères associées à une constante augmentation de la demande énergétique rendent nécessaires les actions à entreprendre en vue d’améliorer l’efficacité énergétique. Dans le domaine du transport, responsable à lui seul de plus de la moitié de la consommation des ressources pétrolières, les actions visant à optimiser la consommation énergétique se traduisent par la mise en place de nouvelles technologies hybrides, par un travail sur l’aérodynamisme des véhicules, la conception de pneumatiques plus performants ou bien encore la réduction de la taille des moteurs et des boites de vitesse afin de réduire le poids des véhicules. Cependant, selon le VTT (Centre de recherche technique finlandais), dans les voitures particulières, les pertes par frottement représentent un tiers de la consommation totale de carburant. Plusieurs millions de litres de carburant sont ainsi utilisés dans le monde chaque année pour vaincre les forces de frottement. Pour cette raison la recherche en tribologie dans le domaine de l’automobile s’est plus particulièrement focalisée ces dernières années sur le développement de matériaux à faible coefficient de frottement ainsi que lubrifiants plus performants. Ce travail de thèse a pour objectif d’étudier le potentiel des nanoparticules de dichalcogénures métalliques en tant qu’additifs de lubrification pour applications automobiles dans le but de développer de nouveaux lubrifiants hautement performants. Ces nanoparticules, synthétisées pour la première fois dans les années 90, ont déjà montré des propriétés tribologiques intéressantes lors de tests effectués en laboratoire, en régime de lubrification limite. Toutefois, leur utilisation dans des systèmes mécaniques réels nécessite une meilleure compréhension de leurs performances dans des conditions plus proches de la réalité, à savoir en présence de surfaces rugueuses ainsi qu’en présence d’additifs couramment utilisés dans les lubrifiants industriels. Au cours de ce travail, nous nous sommes focalisés sur des nanoparticules de bisulfures de tungstène produites industriellement. Le contexte industriel de ce travail de thèse ainsi que les bases de la tribologie seront exposés dans un premier chapitre consacré à l’état de l’art. Dans ce même chapitre, une revue bibliographique des propriétés lubrifiantes des nanoparticules de bisulfures métalliques (MoS2, WS2) observées lors d’essais tribologiques effectués en laboratoire sera également présentée. L’influence de certains paramètres tels que les conditions d’essais, l’effet de la température, de la concentration, de la cristallinité sera également présentée dans ce premier chapitre.Les résultats de mon travail de thèse seront présentés à travers deux grandes parties. Dans une première, les caractéristiques morphologiques et chimiques des nanoparticules étudiées seront présentées. Leurs propriétés tribologiques dans l’huile de base en présence de surfaces en acier de différentes rugosités seront discutées. Enfin, leurs performances en présence d’additifs couramment utilisés dans les applications industrielles ont également été étudiées. Tous ces essais ont été réalisés en régime de lubrification limite et à 100°C. Dans une seconde partie, le potentiel des nanoparticules pour une application boîte de vitesses a été exploré. Des essais tribologiques ont été réalisés à la fois dans une huile de base ainsi qu’en présence d’un cocktail d’additifs, tout d’abord à l’échelle du laboratoire puis lors de tests réels effectués avec des boites de vitesses utilisées dans l’automobile. Les résultats montrent que les nanoparticules peuvent être utilisées pour augmenter la durée de vie des engrenages
The growing environmental concerns, along with the continuous increase of energy demand, have encouraged research to improve energy efficiency in every technological field. In the transport industry, responsible of more than half of the world’s oil consumption, manufacturers have bet on hybrid fuel technologies, more aerodynamic car profiles, innovative tires and even downsizing of engines and gearboxes to reduce the weight of the vehicles to face the problem. However, according to VTT Technical Research Centre of Finland, in passenger cars one third of fuel consumption is due to friction loss. This means that several millions of liters of fuel are used every year to overcome friction around the world. As a consequence, reduction on the friction losses would have a direct impact in oil consumption. For this reason, research in the tribology field has specially focused in the development of low friction materials and more efficient lubricants. This work investigates the potential of metal dichalcogenide nanoparticles as lubricant additives for automobile applications with the aim of formulating more efficient lubricants. These nanoparticles which were synthetized for the first time in the 90’s have shown interesting tribological properties when added to base oil under specific laboratory test conditions. However, their future use in real-life mechanical systems needs a better comprehension of their behavior on rough surfaces and in the presence of additives commonly used in industrial lubricants.Industrially produced tungsten disulfide nanoparticles were used in this work. First of all, the industrial context of this work and the basis of tribology science in general and of tribology in the automotive industry in particular are exposed in the state of the art part. In this section, a literature review of the lubricating properties of laboratory scale produced metal dichalcogenides nanoparticles of tungsten and molybdenum disulfide is exposed. The effect of different conditions (temperature, concentration in oil, contact pressure, among others) is also presented in this first section. The research work done for this thesis is divided in two main parts. In the first one, the nanoparticles were first morphologically and chemically characterized and their tribological potential in base oil was investigated on smooth and rough surfaces under different test conditions. Then, their tribological behavior in the presence of additives that are commonly used in industrial applications, in the boundary lubrication regime and at 100°C was studied.In the second part, the use of nanoparticles for a gearbox application was explored. The potential of the nanoparticles in base oil and in the presence of a commercial package of additives for this application was studied, first at the laboratory scale, and then in scaled-up tests with gearboxes used in cars. The results suggest that nanoparticles can be used to increase life span of the mechanical parts of gears
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Gott, M. D., D. E. Wycoff, E. R. Balkin, B. E. Smith, M. E. Fassbender, C. S. Cutler, A. R. Ketring, D. S. Wilbur, and S. S. Jurisson. "Targetry investigations of 186Re production via proton induced reactions on natural Osmium disulfide and Tungsten disulfide targets." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-164610.

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Introduction Radioisotopes play an important role in nuclear medicine and represent powerful tools for imaging and therapy. With the extensive use of 99mTc-based imaging agents, therapeutic rhenium analogues are highly desirable. Rhenium-186 emits therapeutic − particles with an endpoint-energy of 1.07 MeV, allowing for a small, targeted tissue range of 3.6 mm. Additionally, its low abundance γ-ray emission of 137.2 keV (9.42 %) allows for in vivo tracking of a radiolabeled compounds and dosimetry calculations. With a longer half-life of 3.718 days, synthesis and shipment of Re-186 based radiopharmaceuticals is not limited. Rhenium-186 can be produced either in a reactor or in an accelerator. Currently, Re-186 is produced in a reactor via the 185Re(n,γ) reaction resulting in low specific activity which makes its therapeutic application limited.[1] Production in an accelerator, such as the PETtrace at the University of Missouri Research Reactor (MURR), can theoretically provide a specific activity of 34,600 Ci.mmol−1 Re[2], which represents a 62 fold increase over reactor produced 186Re. The studies reported herein focused on the evaluation of accelerator-based reaction pathways to produce high specific activity (HSA) 186Re. Those pathways include proton and deuteron bombardment of tungsten and osmium targets by the following reactions: 186W(p,n)186Re, 186W(d,2n) 186Re, 189Os(p,α)186Re, and 192Os(p,α3n)186Re. Additional information on target design related to the determination and optimization of production rates, radionuclidic purity, and yield are presented. Material and Methods Osmium and tungsten metals are very hard and thus very brittle. Attempts at pressing the pure metal into aluminum backings resulted in chalky targets, which easily crumbled during handling. Osmium disulfide (OsS2) and tungsten disulfide (WS2) were identified to provide a softer, less brittle chemical form for targets. OsS2 and WS2 targets were prepared using a unilateral press with a 13 mm diameter die to form pressed powder discs. A simple target holder design (FIG. 1) was implemented to provide a stabilizing platform for the pressed discs. The target material was sealed in place with epoxy using a thin aluminum foil pressed over the target face. Initial irradiations of OsS2 were performed using the 16 MeV GE PETtrace cyclotron at MURR. Irradiations were performed for 30–60 minutes with proton beam currents of 10–20 µA. Following irradiation, the OsS2 targets were dissolved in NaOCl and the pH adjusted using NaOH. The resultant aqueous solution was mixed with methyl ethyl ketone (MEK), with the lipophilic perrhenate being extracted into the MEK layer and the osmium and iridium remaining in the aqueous layer. The MEK extracts were then passed through an acidic alumina column to remove any remaining osmium and iridium. Determination of rhenium and iridium activities was done by gamma spectroscopy on an HPGe detector. Preliminary irradiations on WS2 targets were performed at MURR with the beam degraded to 14 MeV with a proton beam current of 10 µA for 60 minutes. After irradiation, WS2 was dissolved using 30% H2O2 with gentle heating and counted on an HPGe detector to determine the radio-nuclides produced. Results and Conclusion Thin natOsS2 targets were produced, irradiated at 16 MeV for 10 µAh, and analyzed for radiorhenium. Under these irradiation conditions, rhenium isotopes were produced in nanocurie quantities while iridium isotopes were produced in microcurie quantities. Future studies with higher proton energies are planned to increase the production of rhenium and decrease the production of iridium. After optimizing irradiation conditions, enriched 189Os will be used for irradiations to reduce the production of unwanted radionuclides. A liquid-liquid extraction method separated the bulk of the rhenium from the iridium. The majority of the rhenium produced was recovered in the first organic aliquot with little iridium observed while the majority of the iridium and osmium was retained in the first aqueous aliquot. Target production with WS2 was successful. A thin target of natWS2 was produced and irradiated at 14 MeV for 10 µAh. Under these irradiation conditions, several rhenium isotopes were produced in microcurie quantities. Target parameters to maximize 186Re production remain to be determined before enriched 186W targets are used for irradiations to reduce the production of unwanted radionuclides. In conclusion, the potential production routes for accelerator-produced high specific activity 186Re are being evaluated. Cyclotron-based irradiations of natOsS2 targets established the feasibility of producing rhenium via the natOs(p,αxn)Re reaction. Current results indicate higher proton energies are necessary to reduce the production of unwanted iridium isotopes while increasing the production of rhenium isotopes. Preliminary irradiations were performed using the 50.5 MeV Scanditronix MC50 clinical cyclotron at the University of Washington to determine irradiation parameters for future higher energy irradiations (20–30 MeV). A rapid liquid-liquid extraction method isolated rhenium from the bulk of the iridium and osmium following irradiation. Preliminary studies indicate WS2 may also provide a suitable target material to produce 186Re via the (p,n) reaction pathway.
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Rathod, Urmilaben Pradipsinh P. "Extrinsic Doping of Few Layered Tungsten Disulfide Films by Pulsed Laser Deposition." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538673/.

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This dissertation tested the hypothesis that pulsed laser deposition (PLD) could be used to create targeted dopant profiles in few layered WS2 films based on congruent evaporation of the target. At the growth temperatures used, 3D Volmer-Weber growth was observed. Increased energy transfer from the PLD plume to the growing films degraded stoichiometry (desorption of sulfur) and mobility. Sulfur vacancies act as donors and produce intrinsic n-type conductivity. Post deposition annealing significantly improved the crystallinity, which was accompanied by a mobility increase from 6.5 to 19.5 cm2/Vs. Preparation conditions that resulted in excess sulfur, possibly in the form of interstitials, resulted in p-type conductivity. Current-voltage studies indicated that Ohmic contacts were governed by surface properties and tunneling. Extrinsic p-type doping of few layered WS2 films with Nb via pulsed laser deposition using ablation targets fabricated from WS2, S and Nb powders is demonstrated. The undoped controls were n-type, and exhibited a Hall mobility of 0.4 cm2/Vs. Films doped at 0.5 and 1.1 atomic percentages niobium were p-type, and characterized by Fermi levels at 0.31 eV and 0.18 eV from the valence band edge. That is, the Fermi level moved closer to the valence band edge with increased doping. With increased Nb doping, the hole concentrations increased from 3.9 x1012 to 8.6 x1013 cm-2, while the mobility decreased from 7.2 to 2.6 cm2/Vs, presumably due to increased ionized impurity scattering. X-ray photoelectron spectroscopy indicates that Nb substitutes on W lattice sites, and the measured peak shifts toward lower binding energy observed corresponded well with the UPS data. Throughout, a clear correlation between degraded stoichiometry and decreased mobility was observed, which indicates that point defect and ionized impurity scattering is a dominant influence on carrier transport in PLD few-layered WS2 films. The approach demonstrates the potential of PLD for targeted doping of transition metal dichalcogenides.
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Johansson, Fredrik. "Combined Tungsten Disulfide and Graphene Low Friction Thin Film : Synthesis and Characterization." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255569.

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Tungsten disulfide is a proven material as a low friction solid coating. The material is well characterized and has proven its capabilities the last century. Graphene is this centurys most promising material with electrical and mechanical properties. With it the 2D material revolution have started. In this thesis I present a feasible way to sputter tungsten disulfide on graphene as a substrate with little damage to the graphene from energetic particles and a straight forward method to quantize the damage before and after deposition. Further I investigate compositional changes in the sputtered films depending on processing pressure and how tungsten disulfide film thickness and the amount of graphene damage affects the materials low friction capabilities. It is shown that graphene is not a viable substrate for a low friction tungsten disulfide film and that tungsten disulfide is an excellent material for low friction coatings even down too a few nanometers and that the films behavior during load in the friction testing significantly depends on the processing pressure during sputtering.
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Mayersky, Joshua. "Development and Characterization of Low Cost Tungsten Disulfide Ink for Ink-jet Printing." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522418413569074.

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Gustavsson, Fredrik. "Triboactive Component Coatings : Tribological Testing and Microanalysis of Low-Friction Tribofilms." Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-191223.

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Coatings are often used on critical components in machines and engines to reduce wear and to provide low friction in order to reduce energy losses and the environmental impact. A triboactive coating not only provides this desired performance, it also actively maintains the low friction by a structural or chemical change in a very thin top layer of these already micrometer thin coatings. This so-called tribofilm is often 5-50 nm thick and can be formed either from the coating itself or by a reaction with the counter surface or the surrounding atmosphere, i.e. gas, fuel, oil, etc. The tribofilm will maintain the wanted performance for as long as the system is not chemically disturbed. This thesis provides a detailed overview of the functionality of triboactive low-friction coatings, in many different systems. The majority of the tribofilms discussed, formed in very different environments, are built up by tungsten disulfide (WS2), which is a material similar to graphite, with a lamellar structure where strongly bonded atomic planes may slip over each other almost without resistance. The major difference is that WS2 is an intrinsically triboactive material, while graphite is not. However, graphite and other carbon-based materials can be made triboactive in certain atmospheres or by addition of other elements, such as hydrogen. The remarkable affinity and driving force to form such WS2 low-friction tribofilms, regardless of the initial states of the sulfur and tungsten, and even when the forming elements are present only at ppm levels, is a recurrent observation in the thesis. Addition of an alloying element to sputtered coatings of WS2 can improve its mechanical and frictional properties significantly. Several promising attempts have been made to find good candidates, out of which a few important ones are investigated in this thesis. Their achievable potential in friction reductions is demonstrated. By reducing friction, energy losses can be avoided, which also results in lower particle and exhaust emissions, which directly reduces the environmental impact. Triboactive coatings are shown to be a promising route to significantly improve tribological applications and allow more environmental friendly and energy efficient vehicles.
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Palomar, Quentin. "Intégration de matériaux nanostructurés dans la conception et la réalisation de biocapteurs sans marquage pour la détection de cibles d'intérêt." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV069/document.

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Le but principal de ces travaux de thèse fut la conception et la réalisation de biocapteurs par utilisation de méthodes de transduction sans marquage, comme la spectroscopie d’impédance électrochimique (EIS), pour la détection de cible d’intérêts. Pour cela, différentes architectures moléculaires, spécifiques à la molécule d’intérêt ciblée, ont été développées afin de permettre la transduction du signal issu de la reconnaissance entre le biorécepteur et son substrat, et conduire ainsi à la détection de la cible.Les systèmes mis au point reposent sur l’intégration de nanomatériaux, tels que les nanotubes de carbones ou le disulfure de tungstène, pour assurer l'immobilisation de l'entité biospécifique à la surface du capteur. L’intérêt de ces matériaux est multiple puisqu’ils permettent une très forte augmentation de la surface spécifique du système et sont également mis à contribution lors de la fonctionnalisation de la surface de l’électrode. Un des grands défis rencontré dans le développement des biocapteurs étant la stratégie d'immobilisation de l'entité biospécifique sur la surface du capteur.Ces travaux se sont donc dans un premier temps intéressés à la réalisation et à la caractérisation de films minces de ces nanomatériaux ainsi qu’à leur transfert à la surface d’une électrode. Dans ce contexte, le but est de concevoir des bioarchitectures poreuses à base de polymères fonctionnels électrogénérés autour des nanostructures de carbone permettant la pénétration de grandes biomolécules comme des anticorps pour développer des immunocapteurs de haute performance.La seconde partie de ce travail s’est donc orientée vers la conception de biocapteurs par utilisation de ces différents matériaux. La fiabilité du procédé de la construction de ces nanostructures poreuses a été validée par la conception de systèmes immunologiques pour la détection de l’anticorps de l’antitoxine du choléra et l’anticorps de la toxine de la dengue.Enfin, un dernier biocapteur enzymatique, s’appuyant sur l’utilisation de nano-bâtonnets de disulfure de tungstène, a été développé. Ce dernier permet la détection de deux molécules d’intérêts, à savoir le catéchol et la dopamine, par utilisation de la polyphénol oxydase
The main purpose of this work was the design and the development of biosensors by using non-marking transduction methods, such as electrochemical impedance spectroscopy (EIS), for the detection of targets of interests. To this end, various molecular architectures have been developed to allow the transduction of the signal resulting from the recognition between the bioreceptor and its substrate, and thus lead to the detection of the target.The systems developed are based on the integration of nanomaterials, such as carbon nanotubes or tungsten disulfide, to ensure the immobilization of the biospecific entity at the surface of the sensor. The advantages of these materials are multiples, since they allow a very large increase in the specific surface area and are also used in the functionalization of the surface of the electrode. Indeed, one of the major challenges encountered in the development of biosensors is the strategy involved in the immobilization of the biospecific entity on the surface of the sensor.This work was initially interested in the realization and characterization of thin films of these nanomaterials as well as their transfer to the surface of an electrode. In this context, the aim is to design porous bioarchitectures based on electrogenerated functional polymers around carbon nanostructures allowing the penetration of large biomolecules such as antibodies to develop high-performance immunosensors.The second part of the work was oriented towards the design of biosensors using these different materials. The reliability of the process has been validated by the design of immunological systems for the detection of the anti-cholera toxin antibody and dengue toxin antibody.Finally, a last enzymatic biosensor, based on the use of tungsten disulfide nano-sticks, has been developed. The latter allows the detection of two molecules of interest, catechol and dopamin, by the use of polyphenol oxidase
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Gorini, Lorenzo. "Electrical contact properties of ultrathin transition metal dichalcogenide sheets." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16884/.

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The graphene discovery led to advances in exfoliation and synthetic techniques, and the lack of a bandgap in graphene has stimulated the research for new 2D semiconducting materials. Transition metal dichalcogenides (TMDCs), semiconductors of the type MX2, where M is a transition metal atom (such as Mo or W) and X is a chalcogen atom (such as S, Se or Te), have recently been isolated. TMDCs exhibit a unique combination of atomic-scale thickness, strong spin–orbit coupling and favourable electronic and mechanical properties, which make them interesting for fundamental studies and for applications in high-end electronics, spintronics, valleytronics and optoelectronics. According to optical measurements, single-layer WS2 sheets exhibit a direct band gap of at least 2.0 eV. Because of its strong spin-orbit coupling induced valence band splitting, WS2 shows spin-valley coupling, even in few-layer sheets , which may allow easier observation of the valley Hall effect than in the other TMDCs. The thesis reviews the theoretical background of TMDCs and their optoelectronic properties. It also reports on the fabrication of field-effect transistors based on few-layer sheets of WS2 and the investigation of their electronic transport properties. Particularly the project focuses on improving the interface between the metal contact and WS2 sheet, where annealing improves the contact transparency. Together with van der Pauw geometry, annealing allows four-terminal measurements to be performed and the pristine properties of the material to be recovered at room temperature, where the devices show n-type behaviour and a linear I-V curve. The promising improvements and the electronic properties shown in this thesis make WS2 interesting for future applications in valleytronic devices.
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Hagerty, Phillip. "Physical Vapor Deposition of Materials for Flexible Two Dimensional Electronic Devices." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1460739765.

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Book chapters on the topic "Tungsten Disulfide"

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Arsenault, Nicole, Rabin Bissessur, and Douglas C. Dahn. "Tungsten Disulfide Polythiophene Nanocomposites." In Advances in Nanostructured Composites, 53–68. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2018] | Series: Advances in nanostructured composites ; volume 2 | “A science publishers book.»: CRC Press, 2019. http://dx.doi.org/10.1201/9780429021718-3.

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Köhler, Mateus H., João P. K. Abal, Gabriel V. Soares, and Marcia C. Barbosa. "Molybdenum Disulfide and Tungsten Disulfide as Novel Two-Dimensional Nanomaterials in Separation Science." In Two-Dimensional (2D) Nanomaterials in Separation Science, 193–217. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72457-3_8.

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Simić, Danica M., Dušica B. Stojanović, Novica Ristović, Milorad Zrilić, Zijah Burzić, Milica Marjanović, Petar S. Uskoković, and Radoslav Aleksić. "Ballistic Composites Reinforced with Inorganic Nanotubes of Tungsten Disulfide." In Springer Proceedings in Materials, 35–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34123-7_4.

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Chen, Shi, and Mao Daheng. "Study on Dispersion Stability and Self-Repair Principle of Ultrafine-Tungsten Disulfide Particulates." In Advanced Tribology, 995–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03653-8_335.

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Adigilli, Harish Kumar, A. K. Pandey, and Joydip Joardar. "2D-Nanolayered Tungsten and Molybdenum Disulfides: Structure, Properties, Synthesis, and Processing for Strategic Applications." In Handbook of Advanced Ceramics and Composites, 1–47. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-73255-8_4-1.

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Adigilli, Harish Kumar, A. K. Pandey, and Joydip Joardar. "2D-Nanolayered Tungsten and Molybdenum Disulfides: Structure, Properties, Synthesis, and Processing for Strategic Applications." In Handbook of Advanced Ceramics and Composites, 75–120. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16347-1_4.

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"Microstructural Characterization of Molybdenum Disulfide and Tungsten Disulfide Catalysts." In Hydrotreating Technology for Pollution Control, 69–92. CRC Press, 1996. http://dx.doi.org/10.1201/9781482273540-5.

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Ohmae, N., N. Mori, M. Tagawa, and M. Umeno. "Synthesis of Tungsten Disulfide on Tungsten-tip Directly inside FIM." In Tribology Series, 127–36. Elsevier, 1993. http://dx.doi.org/10.1016/s0167-8922(08)70369-9.

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Lane, Barrit C. S., Rabin Bissessur, Alaa S. Abd-El-Aziz, Wael H. Alsaedi, Douglas C. Dahn, Emma McDermott, and Andrew Martin. "Exfoliated Nanocomposites Based on Polyaniline and Tungsten Disulfide." In Conducting Polymers. InTech, 2016. http://dx.doi.org/10.5772/63457.

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Joly-Pottuz, Lucile, and Masanori Iwaki. "Superlubricity of Tungsten Disulfide Coatings in Ultra High Vacuum." In Superlubricity, 227–36. Elsevier, 2007. http://dx.doi.org/10.1016/b978-044452772-1/50045-7.

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Conference papers on the topic "Tungsten Disulfide"

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Ye, Yu, Zi Jing Wong, Xiufang Lu, Hanyu Zhu, Yuan Wang, Xianhui Chen, and Xiang Zhang. "Monolayer Tungsten Disulfide Laser." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_si.2015.sm2f.7.

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Roy, Sayan, and Peter Bermel. "2D Tungsten Disulfide Sheets for Ultralight, Flexible Photovoltaics." In Optics for Solar Energy. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/ose.2018.om2d.4.

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Barachati, Fabio S., Antonio Fieramosca, Soroush Hafezian, JIE GU, BISWANATH CHAKRABORTY, Dario Ballarini, Ludvik Martinu, Vinod M. Menon, Daniele Sanvitto, and Stéphane Kéna-Cohen. "Interacting Polariton Fluids in a Monolayer of Tungsten Disulfide." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_at.2018.jth5b.5.

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Ahmed, Hasan, and Viktoriia E. Babicheva. "Resonant and scattering properties of tungsten disulfide WS2 nanoantennas." In Photonic and Phononic Properties of Engineered Nanostructures X, edited by Ali Adibi, Shawn-Yu Lin, and Axel Scherer. SPIE, 2020. http://dx.doi.org/10.1117/12.2544788.

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Su, Hong, Zhenyuan Li, Runhua Zhou, Tingting Jiang, Min Zhang, Huawei Liang, Irene Ling Li, and Shixing Wang. "Study on Conductivity of Tungsten Disulfide Nanosheet at THz Band." In 2019 12th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT). IEEE, 2019. http://dx.doi.org/10.1109/ucmmt47867.2019.9008345.

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Manjunatha, S., B. Chethan, Y. T. Ravikiran, and T. Machappa. "Room temperature humidity sensor based on polyaniline-tungsten disulfide composite." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032431.

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Hussain, Aftab M., Galo A. Torres Sevilla, Kelly R. Rader, and Muhammad M. Hussain. "Chemical vapor deposition based tungsten disulfide (WS2) thin film transistor." In 2013 18th International Conference on Digital Signal Processing (DSP). IEEE, 2013. http://dx.doi.org/10.1109/siecpc.2013.6550981.

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Guan, Heyuan, Kai Xia, Chaoying Chen, Yunhan Luo, Jieyuan Tang, Huihui Lu, Jianhui Yu, Jun Zhang, Yongchun Zhong, and Zhe Chen. "Micro Fiber Coated with Tungsten disulfide and Its Humidity Sensing." In Integrated Photonics Research, Silicon and Nanophotonics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/iprsn.2017.jtu4a.14.

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Guan, Heyuan, Yunhan Luo, Chaoying Chen, Kai Xia, Shuihua Peng, Jieyuan Tang, Huiui Lu, et al. "All fiber-optic humidity sensor based on tungsten disulfide (WS2)." In Asia-Pacific Optical Sensors Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/apos.2016.th4a.29.

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Chen, Hao, Shuangchen Ruan, Tuan Guo, and Peiguang Yan. "Fiber-integrated tungsten disulfide saturable absorber mirrors by magnetron sputtering technique." In 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735786.

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