Pulsed laser-ablated MoS2-Al films: friction and wear in humid conditions

Nainaparampil, J. J.; Phani, A.R.; Krzanowski, James E.; Zabinski, J.S.

doi:10.1016/j.surfcoat.2004.02.043

Cited by 65 publications

(18 citation statements)

References 36 publications

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“…These results are consistent with evidence for a synergistic effect for MoS 2 lubrication when Au is present. This is consistent with previous work on Audoped MoS 2 films [23][24][25], as well as studies showing that metal dopants in MoS 2 enhance the tribological performance in both dry [25][26][27][28][29], and humid air [30][31][32]. Interestingly, the YSZ/Au/MoS 2 film from this study outperformed prior similar films in room temperature conditions (both dry and humid environments) [10].…”

Section: Discussionsupporting

confidence: 92%

Preparation of chameleon coatings for space and ambient environments

Baker¹,

Chromik²,

Wahl³

et al. 2007

Thin Solid Films

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Section: Discussionsupporting

confidence: 92%

Preparation of chameleon coatings for space and ambient environments

Baker¹,

Chromik²,

Wahl³

et al. 2007

Thin Solid Films

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“…Dopants are also proposed to passivate edge sites so that they are less reactive with available oxygen [190]. Lastly, in cases where dopants exists as a separate phase, it has been proposed that the dopant atoms bond with oxygen to form an oxide [191].…”

Section: Tribological Properties Of Doped Mos2mentioning

confidence: 99%

Solid Lubrication with MoS2: A Review

et al. 2019

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Molybdenum disulfide (MoS2) is one of the most broadly utilized solid lubricants with a wide range of applications, including but not limited to those in the aerospace/space industry. Here we present a focused review of solid lubrication with MoS2 by highlighting its structure, synthesis, applications and the fundamental mechanisms underlying its lubricative properties, together with a discussion of their environmental and temperature dependence. An effort is made to cover the main theoretical and experimental studies that constitute milestones in our scientific understanding. The review also includes an extensive overview of the structure and tribological properties of doped MoS2, followed by a discussion of potential future research directions.MoS2 belongs to the family of layered two-dimensional transitional metal dichalcogenides (TMDs). Like graphite and hexagonal boron nitride, its crystal structure consists of covalently bonded sheets, which form stacks that are held together only by weak Van der Waals interactions [16]. It occurs naturally as the mineral molybdenite, an important Mo ore. Due to the strong bonding inplane and weak bonding out-of-plane, mechanical and other properties are highly anisotropic [17], and the stacks can be easily sheared. Single-layer or few-layer (i.e. 2D) MoS2 (analogous to graphene) can be produced and studied individually [18].MoS2 has several different possible structures (polytypes), depending on the bonding within the sheets and the stacks of the sheets. While graphite has a single plane of atoms per sheet, in MoS2 each sheet consists a plane of Mo atoms sandwiched between two planes of S atoms. The single-sheet structure can feature trigonal prismatic coordination around Mo, which is the semiconducting 1H ("hexagonal") structure, or octahedral bonding, which is the metallic 1T ("trigonal") phase. 1H and the ideal 1T each have 3 atoms (MoS2) per unit cell ( Figure 1); however, theoretical calculations with density-functional theory (DFT)[19] and X-ray diffraction (XRD) experiments [20] have shown that in fact 1T is unstable with respect to distortions. The most commonly reported structure is a 3× 3 distortion that triples the unit cell, known as the 1T′ phase [21].Each single-sheet structure can be stacked into a crystal where the next sheet is exactly above the preceding one (AA stacking), producing the 1H, 1T, and 1T′ polytypes. The naturally occurring polytypes in molybdenite, however, are only based on the 1H sheet, and show more complicated stacking [9]. The more common is the 2H structure with 2 sheets per cell in AB stacking, where an S atom in one layer is above an Mo atom in the layer below [22,23]. The less common 3R ("rhombohedral") structure has 3 sheets per cell with ABC stacking [22,24]. These structures are shown in Figure 1. Mo-S bond lengths are around 2.4 Å for all polytypes [25]. DFT calculations show only very small energy differences between the 2H and 3R phases [25]. This insensitivity to stacking, and the low surface energy for 2H-MoS2 of 47 mJ/m 2 =...

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“…), the wear-resistance of MoS 2 films can be increased significantly because of the different effects such as alloy strengthening, micro-structural densification, and improvement in film-substrate adhesion and anti-oxidation property [10][11][12][13][14][15][16][17] . These MoS 2 based composite films exhibit much better wear-resistances than the pure MoS 2 film in vacuum environment.…”

Section: Introductionmentioning

confidence: 99%

Atomic Oxygen Effect on Sputtered MoS2-Ag Composite Film

Zhang¹,

He²

2017

dtetr

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ABSTRACT MoS 2 -Ag composite film was co-deposited by rf-sputtering technology and irradiated by atomic oxygen (AO) using a ground AO simulation facility. The structure, morphology, composition and tribological property of the composite films before and after the AO irradiation were investigated using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), X-ray photoelectron spectroscope (XPS) and ball-on-disk tribometer, respectively. The results revealed that the MoS 2 -Ag composite film was severely oxidized by the AO irradiation and the wear resistance was declined significantly; the MoS 2 phase was mainly oxidized to MoO 3 and the Ag was changed to a mixture of AgO and Ag 2 O; and the cracking phenomenon was obvious after the AO irradiation. The oxidation behavior was mainly controlled by the Ag, not the MoS 2 .

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Pulsed laser-ablated MoS2-Al films: friction and wear in humid conditions

Cited by 65 publications

References 36 publications

Preparation of chameleon coatings for space and ambient environments

Preparation of chameleon coatings for space and ambient environments

Solid Lubrication with MoS2: A Review

Atomic Oxygen Effect on Sputtered MoS2-Ag Composite Film

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