Impact of Microstructure on MoS2 Oxidation and Friction
John F. Curry,Mark Wilson,Henry S. Luftman,Nicholas C. Strandwitz,Nicolas Argibay,Michael Chandross,Mark A. Sidebottom,Brandon A. Krick +7 more
TLDR
Investigation of oxidation and friction for two MoS2 films with distinctively different microstructures-amorphous and planar/highly-ordered- before and after exposure to atomic oxygen (AO) and high-temperature (250 °C) molecular oxygen shows comparable oxidation of both coatings via AO; however, monolayer resolved compositional depth profiles from HS-LEIS reveal that the microstructure of the ordered coatings limits oxidation to the first atomic layer.Abstract:
This work demonstrates the role of microstructure in the friction and oxidation behavior of the lamellar solid lubricant molybdenum disulfide (MoS2). We report on systematic investigations of oxidation and friction for two MoS2 films with distinctively different microstructures—amorphous and planar/highly-ordered—before and after exposure to atomic oxygen (AO) and high-temperature (250 °C) molecular oxygen. A combination of experimental tribology, molecular dynamics simulations, X-ray photoelectron spectroscopy (XPS), and high-sensitivity low-energy ion scattering (HS-LEIS) was used to reveal new insights about the links between structure and properties of these widely utilized low-friction materials. Initially, ordered MoS2 films showed a surprising resistance to both atomic and molecular oxygens (even at elevated temperature), retaining characteristic low friction after exposure to extreme oxidative environments. XPS shows comparable oxidation of both coatings via AO; however, monolayer resolved composi...read more
Citations
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Solid Lubrication with MoS2: A Review
TL;DR: In this article, the authors present a focused review of solid lubrication with molybdenum disulfide by highlighting its structure, synthesis, applications and the fundamental mechanisms underlying its lubricative properties, together with a discussion of their environmental and temperature dependence.
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Black Phosphorus: Degradation Favors Lubrication.
TL;DR: It is indicated that, besides its layered structure, the ambient degradation of BP significantly favors its lubrication behavior.
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2D nano-materials beyond graphene: from synthesis to tribological studies
Abstract: Continuously increasing global population and, therefore, energy consumption as well as diminishing resources combined with environmental aspects such as global warming ask for more efficient, sustainable and reliable processes/applications of mechanically moving parts. Especially under harsh conditions, such as high temperatures, vacuum or dry contacts, 2D layered nano-materials used as solid lubricants have demonstrated to be promising candidates to ensure low friction and wear over the entire component’s lifetime. Therefore, this review article aims at summarizing the existing state-of-art regarding solid lubricants with a special emphasis on 2D layered nano-material beyond graphene including graphene oxide, reduced graphene oxide, MoS2, WS2 as well as Ti3C2Tx MXene nanosheets. Initially, experimental approaches allowing for a large-scale and layer-dependent synthesis are reviewed for each nano-material. Subsequently, their friction and wear mechanisms at the nano-scale are discussed. Afterwards, the ability to improve friction and wear are reviewed when using the aforementioned 2D nano-materials either as a solid lubricant, lubricant additive under lubricated conditions or reinforcement phase in composite materials. Finally, the existing challenges and shortcomings of each 2D nano-material are discussed before deriving the general conclusions and giving some future research directions.
Journal ArticleDOI
Comparing space adaptability of diamond-like carbon and molybdenum disulfide films toward synergistic lubrication
Wenhua Zhuang,Xiaoqiang Fan,Wen Li,Hao Li,Lin Zhang,Jinfang Peng,Zhen-bing Cai,Jiliang Mo,Guangan Zhang,Minhao Zhu +9 more
TL;DR: In this article, the effects of space irradiation-induced damage to onefold lubricants including four multialkylated cyclopentanes (MACs) space greases, Chromium doped diamond-like carbon (Cr-DLC) and molybdenum disulfide (MoS2) films were investigated under simulated space environment (atomic oxygen (AO) and proton (PR)).
Journal ArticleDOI
One-Step Hydrothermal Synthesis of Phase-Engineered MoS2/MoO3 Electrocatalysts for Hydrogen Evolution Reaction
Duraisamy Shanmughasundaram,Abhijit Ganguly,Preetam K. Sharma,James Davis,Pagona Papakonstantinou,John Benson +5 more
TL;DR: In this paper, the development of suitable approaches for the synthesis of ultrathin transition-metal dichalcogenide (TMD) catalysts is required to engineer phases, intercoupling between different phases, in-plan.
References
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Journal ArticleDOI
Single-layer MoS2 transistors
TL;DR: Because monolayer MoS(2) has a direct bandgap, it can be used to construct interband tunnel FETs, which offer lower power consumption than classical transistors, and could also complement graphene in applications that require thin transparent semiconductors, such as optoelectronics and energy harvesting.
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Ultrasensitive photodetectors based on monolayer MoS2.
TL;DR: Ultraensitive monolayer MoS2 phototransistors with improved device mobility and ON current are demonstrated, showing important potential for applications in MoS 2-based integrated optoelectronic circuits, light sensing, biomedical imaging, video recording and spectroscopy.
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Engineering the surface structure of MoS2 to preferentially expose active edge sites for electrocatalysis
TL;DR: This work engineer the surface structure of MoS(2) to preferentially expose edge sites to effect improved catalysis by successfully synthesizing contiguous large-area thin films of a highly ordered double-gyroid MoS (2) bicontinuous network with nanoscaled pores.
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Integrated Circuits Based on Bilayer MoS2 Transistors
Han Wang,Lili Yu,Yi-Hsien Lee,Yi-Hsien Lee,Yumeng Shi,Allen Hsu,Matthew L. Chin,Lain-Jong Li,Madan Dubey,Jing Kong,Tomas Palacios +10 more
TL;DR: This paper demonstrates an inverter, a NAND gate, a static random access memory, and a five-stage ring oscillator based on a direct-coupled transistor logic technology based on the semiconducting nature of molybdenum disulfide.
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Hysteresis in single-layer MoS2 field effect transistors.
TL;DR: Uniform encapsulation of MoS(2) transistor structures with silicon nitride grown by plasma-enhanced chemical vapor deposition is effective in minimizing the hysteresis, while the device mobility is improved by over 1 order of magnitude.