Raman and TEM characterization of 2D layered MoS2 crystals grown on non-metal surfaces by friction-induced synthesis

Tanabe, Tadao; Osaki, Junya; Miyajima, Makoto; Kitamura, Kazuyuki; Oyama, Yutaka

doi:10.1016/j.apsusc.2021.150016

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…Therefore, researchers have conducted in-depth research on the preparation method, electronic structure characteristics, and optical characteristics of MoS 2 [15,16]. At the same time, the effects of defects and other factors on MoS 2 have also been studied [17,18].…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study on the Effect of Strain on Single-Layer Molybdenum Disulfide

et al. 2021

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By adopting the first-principles plane wave pseudopotential method based on density functional theory, the electronic structure properties of single-layer MoS2 (molybdenum disulfide) crystals under biaxial strain are studied. The calculation results in this paper show that when a small strain is applied to a single-layer MoS2, its band structure changes from a direct band gap to an indirect band gap. As the strain increases, the energy band still maintains the characteristics of the indirect band gap, and the band gap shows a linear downward trend. Through further analysis of the density of states, sub-orbital density of states, thermodynamic parameters and Raman spectroscopy, it revealed the variation of single-layer MoS2 with strain. This provides a theoretical basis for realizing the strain regulation of MoS2.

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Section: Introductionmentioning

confidence: 99%

First-Principles Study on the Effect of Strain on Single-Layer Molybdenum Disulfide

et al. 2021

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“…In the Raman spectrum of MoS 2 , it was found that there are two strong characteristic peaks at about 403 and 374 cm −1 , which are attributed to the out-of-plane vibration mode (A 1g ) and the in-plane vibration mode (E 2g 1 ), respectively. 55 In the Raman spectrum of the P(NIPAM-co-AAc) hydrogel without MoS 2 , a wide band was found at 1000− 2000 cm −1 , indicating the amorphous dried hydrogel, and no MoS 2 characteristic peak was found. When the MoS 2 loading content is low, there are rather weak peaks belonging to MoS 2 in the Raman spectrum of P(NIPAM-co-AAc)/MoS 2 .…”

Section: ■ Results and Discussionmentioning

confidence: 93%

“…Figure b shows the Raman spectra of MoS 2 , P(NIPAM- co -AAc) hydrogels, and P(NIPAM- co -AAc)/MoS 2 composite hydrogels. In the Raman spectrum of MoS 2 , it was found that there are two strong characteristic peaks at about 403 and 374 cm –1 , which are attributed to the out-of-plane vibration mode (A 1g ) and the in-plane vibration mode (E 2g 1 ), respectively . In the Raman spectrum of the P(NIPAM- co -AAc) hydrogel without MoS 2 , a wide band was found at 1000–2000 cm –1 , indicating the amorphous dried hydrogel, and no MoS 2 characteristic peak was found.…”

Section: Resultsmentioning

confidence: 99%

Facile Preparation and Dye Adsorption Performance of Poly(N-isopropylacrylamide-co-acrylic acid)/Molybdenum Disulfide Composite Hydrogels

Yang

Wang

et al. 2021

ACS Omega

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Using N-isopropylacrylamide (NIPAM) and acrylic acid (AAc) as monomers, N,N′-methylenebisacrylamide (MBA) as a cross-linking agent, and molybdenum disulfide (MoS 2 ) as functional particles, a P(NIPAM-co-AAc)/MoS 2 composite hydrogel was prepared by free radical polymerization initiated by ultraviolet light. The results of Fourier transform infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy show that MoS 2 has been successfully introduced into the P(NIPAM-co-AAc) system, and the obtained composite hydrogel has a porous network structure. Studies on the swelling property and dye adsorption performance show that the addition of MoS 2 can increase the swelling ratio of P(NIPAM-co-AAc) hydrogels to a certain extent and can significantly improve the ability of the P(NIPAM-co-AAc) hydrogel to adsorb methylene blue (MB). The adsorption process of MB by the composite hydrogels conforms to the pseudo-secondorder kinetics and the Langmuir isotherm adsorption models. The estimated equilibrium adsorption capacity (Q m ) using the Langmuir isotherm model can reach 1258 mg/g, mainly due to the electrostatic interaction between the negatively charged groups −COO − and MoS 2 particles on the network structure and the positively charged dye MB. The adsorption of MB by P(NIPAM-co-AAc)/MoS 2 composite hydrogels depends on the temperature during adsorption. Compared with room temperature, a high temperature of 40 °C above the poly(N-isopropylacrylamide) (PNIPAM) phase transition temperature (∼32 °C) leads to a decreased adsorption capacity of the P(NIPAM-co-AAc)/MoS 2 composite hydrogel for MB due to the enhanced hydrophobic properties of the network structure and the decrease of the swelling ratio. The prepared hydrogel material can be used as a good adsorbent for dyes, which is promising in wastewater treatment.

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“…In particular, MoDTC reduces friction by forming a MoS 2 tribofilm on the contact area, [7][8][9][10] whereas ZDDP prevents wear by forming an amorphous tribofilm with multilayered structures. 5,6,11 Thus, recent studies have focused on the influence of metallic and nonmetallic substrates in the tribochemical reactions of MoDTC [12][13][14] and ZDDP. [15][16][17] Chlorine-containing EP additives are commonly used in the cold-working processes of steel because of their cost effectiveness and high lubricity along with high corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, MoDTC reduces friction by forming a MoS 2 tribofilm on the contact area, 7–10 whereas ZDDP prevents wear by forming an amorphous tribofilm with multilayered structures 5,6,11 . Thus, recent studies have focused on the influence of metallic and nonmetallic substrates in the tribochemical reactions of MoDTC 12–14 and ZDDP 15–17 …”

Section: Introductionmentioning

confidence: 99%

Structural characterisation of iron sulfide tribofilms formed on carbon and stainless steels

Miyajima

Yonemura

Kitamura

et al. 2023

Lubrication Science

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This study investigated tribofilm layers formed under boundary lubrication using a polysulfide additive on S45C and SUS304 steel surfaces. In the tribotests, the friction coefficient of the SUS304 disc fluctuated and increased more gradually in comparison to that of the S45C disc. The tribofilm on the S45C disc comprised the outermost and inner layers of FeS2 (pyrite) and FeS (troilite), respectively. Notably, all the tribofilm layers on the SUS304 disc surface contained pyrite. The tribofilm on the SUS304 disc was weakly crystalline in the outermost layer and thinner than that on the S45C disc. The poor formation of the tribofilm on the SUS304 disc was potentially caused by the unstable friction coefficient and scuffing.

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Raman and TEM characterization of 2D layered MoS2 crystals grown on non-metal surfaces by friction-induced synthesis

Cited by 7 publications

References 14 publications

First-Principles Study on the Effect of Strain on Single-Layer Molybdenum Disulfide

First-Principles Study on the Effect of Strain on Single-Layer Molybdenum Disulfide

Facile Preparation and Dye Adsorption Performance of Poly(N-isopropylacrylamide-co-acrylic acid)/Molybdenum Disulfide Composite Hydrogels

Structural characterisation of iron sulfide tribofilms formed on carbon and stainless steels

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