Статті в журналах: "2H-MoS2"

1

Zhao, Wan, Xin Liu, Xiuru Yang, Chunxi Liu, Xiaoxiao Qian, Tao Sun, Wenya Chang, Jingjing Zhang, and Zhi Chen. "Synthesis of Novel 1T/2H-MoS2 from MoO3 Nanowires with Enhanced Photocatalytic Performance." Nanomaterials 10, no. 6 (June 6, 2020): 1124. http://dx.doi.org/10.3390/nano10061124.

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Metallic 1T-phase MoS2 is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H-MoS2. Herein, 1T/2H-MoS2(N) (N: MoO3 nanowires were used to prepare 1T/2H-MoS2) was synthesized by using molybdenum trioxide (MoO3) nanowires as the starting material and applied in the photodegradation of antibiotic residue in water. Enhanced photocatalytic performance was observed on the obtained 1T/2H-MoS2(N), which was 2.8 and 1.3 times higher than those on 1T/2H-MoS2(P) (P: commercial MoO3 powder was used to prepare 1T/2H-MoS2) and 2H-MoS2, respectively. The active component responsible for the photodegradation was detected and a reaction mechanism is proposed.

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2

Li, Dong Dong, Yan Hua Lei, Ning Tan, Tao Liu, Xue Ting Chang, Run Hua Fan, and Guan Hui Gao. "One-Step Hydrothermal Synthesis of 1T@2H MoS₂ for Enhanced Photocatalytic Degradation Performance of Methyl Blue." Materials Science Forum 993 (May 2020): 1496–501. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1496.

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Photocatalytic technology is widely used in water purification because of its environmental protection, high efficiency and energy saving. Therefore, it is extremely important for the selection and preparation of specific semiconductor materials used in the field of photocatalysis. In this work, 1T@2H MoS2 nanosheets were fabricated by simple hydrothermal method, and the photocatalytic property of as-prepared 1T@2H MoS2 were investigated by the photo-degradation of methylene blue (MB) water solutions under visible light irradiation via 2H MoS2.The results indicated that compared to 2H MoS2, the 1T@2H MoS2 exhibited more excellent photocatalytic degradation property. After 150 minutes of irradiation under visible light, 1T@2H MoS2 had a removal rate of 98% for MB, and 2H MoS2 eventually reached 19%. The enhancement photocatalytic property of 1T@2H MoS2 could be attributed to the reduced band gap energy of the hybrid-nanosheets and the increased in electron migration speed.

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3

Zhu, Xiangjiu, Hongxing Jiang, Yukai Zhang, Dandan Wang, Lin Fan, Yanli Chen, Xin Qu, Lihua Yang, and Yang Liu. "Tunable Contact Types and Interfacial Electronic Properties in TaS2/MoS2 and TaS2/WSe2 Heterostructures." Molecules 28, no. 14 (July 24, 2023): 5607. http://dx.doi.org/10.3390/molecules28145607.

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Following the successful experimental synthesis of single-layer metallic 1T-TaS2 and semiconducting 2H-MoS2, 2H-WSe2, we perform a first-principles study to investigate the electronic and interfacial features of metal/semiconductor 1T-TaS2/2H-MoS2 and 1T-TaS2/2H-WSe2 van der Waals heterostructures (vdWHs) contact. We show that 1T-TaS2/2H-MoS2 and 1T-TaS2/2H-WSe2 form n-type Schottky contact (n-ShC type) and p-type Schottky contact (p-ShC type) with ultralow Schottky barrier height (SBH), respectively. This indicates that 1T-TaS2 can be considered as an effective metal contact with high charge injection efficiency for 2H-MoS2, 2H-WSe2 semiconductors. In addition, the electronic structure and interfacial properties of 1T-TaS2/2H-MoS2 and 1T-TaS2/2H-WSe2 van der Waals heterostructures can be transformed from n-type to p-type Schottky contact through the effect of layer spacing and the electric field. At the same time, the transition from Schottky contact to Ohmic contact can also occur by relying on the electric field and different interlayer spacing. Our results may provide a new approach for photoelectric application design based on metal/semiconductor 1T-TaS2/2H-MoS2 and 1T-TaS2/2H-WSe2 van der Waals heterostructures.

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4

Dong, Daoyu, Weitao Yan, Yaqiu Tao, Yunfei Liu, Yinong Lu, and Zhigang Pan. "Preparation and Photocatalytic Performance of MoS2/MoO2 Composite Catalyst." Materials 16, no. 11 (May 28, 2023): 4030. http://dx.doi.org/10.3390/ma16114030.

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Solar energy is an inexhaustible clean energy providing a key solution to the dual challenges of energy and environmental crises. Graphite-like layered molybdenum disulfide (MoS2) is a promising photocatalytic material with three different crystal structures, 1T, 2H and 3R, each with distinct photoelectric properties. In this paper, 1T-MoS2 and 2H-MoS2, which are widely used in photocatalytic hydrogen evolution, were combined with MoO2 to form composite catalysts using a bottom-up one-step hydrothermal method. The microstructure and morphology of the composite catalysts were studied by XRD, SEM, BET, XPS and EIS. The prepared catalysts were used in the photocatalytic hydrogen evolution of formic acid. The results show that MoS2/MoO2 composite catalysts have an excellent catalytic effect on hydrogen evolution from formic acid. By analyzing the photocatalytic hydrogen production performance of composite catalysts, it suggests that the properties of MoS2 composite catalysts with different polymorphs are distinct, and different content of MoO2 also bring differences. Among the composite catalysts, 2H-MoS2/MoO2 composite catalysts with 48% MoO2 content show the best performance. The hydrogen yield is 960 µmol/h, which is 1.2 times pure 2H-MoS2 and two times pure MoO2. The hydrogen selectivity reaches 75%, which is 22% times higher than that of pure 2H-MoS2 and 30% higher than that of MoO2. The excellent performance of the 2H-MoS2/MoO2 composite catalyst is mainly due to the formation of the heterogeneous structure between MoS2 and MoO2, which improves the migration of photogenerated carriers and reduces the possibilities of recombination through the internal electric field. MoS2/MoO2 composite catalyst provides a cheap and efficient solution for photocatalytic hydrogen production from formic acid.

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5

Dong, Sha, Xiaoli Sun, and Zhiguo Wang. "Trapping polysulfide on two-dimensional molybdenum disulfide for Li–S batteries through phase selection with optimized binding." Beilstein Journal of Nanotechnology 10 (March 26, 2019): 774–80. http://dx.doi.org/10.3762/bjnano.10.77.

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Introducing anchoring materials into cathodes for Li–S batteries has been demonstrated as an effective way to overcome the shuttle effect and enhance the cycling stability. In this work, the anchoring effects of 2H-MoS2 and 1T'-MoS2 monolayers for Li–S batteries were investigated by using density functional theory calculations. It was found that the binding energies of Li2S x absorbed on 1T'-MoS2 monolayer are in the range of 0.31–2.94 eV, which is much higher than on the 2H-phase. The 1T'-MoS2 monolayer shows stronger trapping ability for Li2S x than the 2H-MoS2 monolayer. The 1T'-MoS2 monolayer can be used as effective anchoring material in cathodes for Li–S batteries.

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6

Wang, Yipin, Rongfang Zhang, Genliang Han, and Xiaoping Gao. "Band Gap Narrowed P Doped 1T@2H MoS2 Nanosheets Towards Synergistically Enhanced Visible Light Photochemical Property." Journal of Nanoelectronics and Optoelectronics 15, no. 2 (February 1, 2020): 257–63. http://dx.doi.org/10.1166/jno.2020.2714.

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The weak transport charge efficiency and great band gap energy of layered MoS2 hamper its further commercial application. To overcome these deficiencies, we report a simple, controlled and handy hydrothermal process for realizing 2H MoS2 to 1T MoS2 transition with P source. Due to the more conductive ability and larger surface area, P-doped 1T@2H MoS2 nanosheets show an outstanding catalytic activity. Noticeably, P-doped 1T@2H MoS2 nanosheets with narrowed bandgap exhibits a remarkable optical photochemical performance. It fully eliminates 50 ml of 20 mg L–1 RhB in 70 minutes with outstanding recycling and structural stability by using 10 mg catalyst.

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7

Xu, Te-Te, Pan Zhao, Zhen-Yi Jiang, Ji-Ming Zheng, and Yan-Ming Lin. "Bridge role of weak chemical bonding in photocatalytic performance of asymmetric 2H-MoS₂/BiOCl Janus heterostructure." Materials Research Express 9, no. 2 (February 1, 2022): 025902. http://dx.doi.org/10.1088/2053-1591/ac565c.

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Abstract The geometric and electronic structure, partial (band decomposed) charge density, charge transfer, electron localization function and photocatalytic mechanism of the asymmetric 2H-MoS2/BiOCl Janus heterostructure were systematically studied with first-principles density functional theory. Our calculations showed that there exist several newly formed weak Bi-S bonds with shorter bond lengths between BiOCl and 2H-MoS2 which act as an electron transport bridge along the direction perpendicular to the heterojunction interface. This newly weak bonds lead to the formation of occupied shallow defect levels approximately 0.0–0.9 eV below the bottom of the conduction band. Electrons located at these defect levels can easily jump into the conduction band as a donor energy level under thermal fluctuations and simultaneously further promote the effective separation of photo-generated electron-hole pairs in the BiOCl. The photogenerated electrons located around Bi-atom layer in the conduction band of BiOCl transfer to the valence band of 2H-MoS2 around the S-atom layer through the interface of the asymmetric 2H-MoS2/BiOCl Janus heterostructure, which significantly reduce photo-generated holes in the 2H-MoS2 and electrons in the BiOCl. The large numbers of photogenerated electrons from the 2H-MoS2 cannot recombine with holes owing to lack of sufficient holes. They will move to the surface and greatly improve the hydrogen production activity in the 2H-MoS2. While the photogenerated holes from the BiOCl will significantly improve the ability of BiOCl to oxidize pollutant in the water owing to the absence of sufficient electrons. Our studies provide new way for the design of asymmetric Janus double-layer heterostructures with newly formed weak chemical bonding.

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8

Khai, Tran Van, Le Ngoc Long, Le Van Thang, Tran Hoang Minh, Vinh-Dat Vuong, Tran Thanh Xuan, and Mai Thanh Phong. "Effects of pH on the Structure and Optical Property of Molybdenum Disulfide Nanocrystals Synthesized by Hydrothermal Method." Chiang Mai Journal of Science 50, no. 2 (March 31, 2023): 1–14. http://dx.doi.org/10.12982/cmjs.2023.011.

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Molybdenum disulphide (MoS2) is emerging as one of the most attractive two-dimensional (2D) materials amongst the transition metal dichalcogenides (TMDs) group. MoS2 exhibits a thickness-dependent band gap that changes from indirect band gap of ~1.3 eV for bulk MoS2 to direct band gap of ~1.9 eV in monolayer form. Such indirect-to-direct gap transition due to quantum confi nement results in giant enhancement in photoluminescence quantum yield. Recent study demonstrated that the co-existence of 2H- and 1T-MoS2 synthesized by hydrothermal method exhibited superior electronic conductivity to those with 2H semiconducting phase. Metallic 1T phase of MoS2 is attracting much attention due to its high electronic conductivity and potential applications in supercapacitors, thermoelectric energy harvesting, and memristors. In this paper, we investigated a hybrid structure between 2H and 1T of MoS2 by a hydrothermal process and investigated its optical property via photoluminescence spectra with changes in pH values. Our results indicated that photoluminescence occurred in the visible light region and the band gap was determined to be ~1.96–2.50 eV. In addition, pH of the precursor solution strongly affected the fi nal structure of MoS2 nanocrystals, which in turn, affected their photoluminescence property wherein pH = 4–5 was identifi ed as optimum for 2H–1T-MoS2 synthesis.

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9

Hu, J. J., J. H. Sanders, and J. S. Zabinski. "Synthesis and microstructural characterization of inorganic fullerene-like MoS2 and graphite-MoS2 hybrid nanoparticles." Journal of Materials Research 21, no. 4 (April 1, 2006): 1033–40. http://dx.doi.org/10.1557/jmr.2006.0118.

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The structures of inorganic fullerene-like (IF) MoS2 nanoparticles produced by arc discharge in water are reported in this paper. To adjust the chemistry and structure of IF nanoparticles, 2H–MoS2, graphite and composite 2H–MoS2/graphite rods were used as electrodes in the arc synthesis. In comparison to using MoS2 as both anode and cathode, mixed electrodes (graphite and MoS2) significantly increased the discharge current. Various IF-MoS2 nanoparticles were successfully produced by the water-based arc method, and their microstructures were studied using a transmission electron microscope equipped with an x-ray energy dispersive spectrometer. The IF–MoS2 nanoparticles commonly had a solid core wrapped with a few MoS2 layers and exhibit some differences in size and geometry. The IF-MoS2 nanoparticles were typically 5–30 nm in diameter as observed by transmission electron microscopy. Tiny IF-MoS2 nanoparticles (<10 nm) along with fragments of lamellar MoS2 were produced from arc discharge in water using both graphite and MoS2 electrodes. Carbon nano-onions and hybrid nanoparticles consisting of carbon and MoS2 were synthesized by using mixed electrodes of graphite and 2H–MoS2. The hybrid nanoparticles were MoS2 cores covered by a graphite shell. Our results show that the water-based arc method provides a simple tool for producing a variety of nanoparticles including some familiar and some new hybrid structures.

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10

Zhang, Hanyu, Tamara D. Koledin, Xiang Wang, Ji Hao, Sanjini U. Nanayakkara, Nuwan H. Attanayake, Zhaodong Li, Michael V. Mirkin, and Elisa M. Miller. "Stabilizing the heavily-doped and metallic phase of MoS₂ monolayers with surface functionalization." 2D Materials 9, no. 1 (December 24, 2021): 015033. http://dx.doi.org/10.1088/2053-1583/ac3f44.

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Abstract Monolayer molybdenum disulfide (MoS2) is one of the most studied two-dimensional (2D) transition metal dichalcogenides that is being investigated for various optoelectronic properties, such as catalysis, sensors, photovoltaics, and batteries. One such property that makes this material attractive is the ease in which 2D MoS2 can be converted between the semiconducting (2H) and metallic/semi-metallic (1T/1T′) phases or heavily n-type doped 2H phase with ion intercalation, strain, or excess negative charge. Using n-butyl lithium (BuLi) immersion treatments, we achieve 2H MoS2 monolayers that are heavily n-type doped with shorter immersion times (10–120 mins) or conversion to the 1T/1T′ phase with longer immersion times (6–24 h); however, these doped/converted monolayers are not stable and promptly revert back to the initial 2H phase upon exposure to air. To overcome this issue and maintain the modification of the monolayer MoS2 upon air exposure, we use BuLi treatments plus surface functionalization p-(CH3CH2)2NPh-MoS2 (Et2N-MoS2)—to maintain heavily n-type doped 2H phase or the 1T/1T′ phase, which is preserved for over two weeks when on indium tin oxide or sapphire substrates. We also determine that the low sheet resistance and metallic-like properties correlate with the BuLi immersion times. These modified MoS2 materials are characterized with confocal Raman/photoluminescence, absorption, x-ray photoelectron spectroscopy as well as scanning Kelvin probe microscopy, scanning electrochemical microscopy, and four-point probe sheet resistance measurements to quantify the differences in the monolayer optoelectronic properties. We will demonstrate chemical methodologies to control the modified monolayer MoS2 that likely extend to other 2D transition metal dichalcogenides, which will greatly expand the uses for these nanomaterials.

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11

Houssa, Michel, Ruishen Meng, Valery Afanas’ev, and André Stesmans. "First-Principles Study of the Contact Resistance at 2D Metal/2D Semiconductor Heterojunctions." Applied Sciences 10, no. 8 (April 15, 2020): 2731. http://dx.doi.org/10.3390/app10082731.

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The high contact resistance at metal/two-dimensional (2D) semiconductor junctions is a major issue for the integration of 2D materials in nanoelectronic devices. We review here recent theoretical results on the contact resistance at lateral heterojunctions between graphene or 1T-MoS2 with 2H-MoS2 monolayers. The transport properties at these junctions are computed using density functional theory and the non-equilibrium Green’s function method. The contact resistance is found to strongly depend on the edge contact symmetry/termination at graphene/2H-MoS2 contacts, varying between about 2 × 102 and 2 × 104 Ω∙μm. This large variation is correlated to the presence or absence of dangling bond defects and/or polar bonds at the interface. On the other hand, the large computed contact resistance at pristine 1T/2H-MoS2 junctions, in the range of 3–4 × 104 Ω.μm, is related to the large electron energy barrier (about 0.8 eV) at the interface. The functionalization of the metallic 1T-MoS2 contact by various adsorbates is predicted to decrease the contact resistance by about two orders of magnitude, being very promising for device applications.

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12

Xing, Jiqi, Hongyu Shi, Yingdi Li, and Juan Liu. "Molecular dynamics study of Cr doping on the crystal structure and surficial/interfacial properties of 2H-MoS₂." Physical Chemistry Chemical Physics 24, no. 7 (2022): 4547–54. http://dx.doi.org/10.1039/d1cp05199g.

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13

Fareza, Ananta Rizki, Ferry Anggoro Ardy Nugroho, and Vivi Fauzia. "Facile Synthesis of 1T-MoS₂ Nanoflowers Using Hydrothermal Method." Materials Science Forum 1028 (April 2021): 173–78. http://dx.doi.org/10.4028/www.scientific.net/msf.1028.173.

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Molybdenum disulfide (MoS2) is one of the promising 2D materials thanks to its outstanding physicochemical properties and therefore is predicted to play a key role in optoelectronics devices and energy applications. MoS2 exhibits three phases with distinctive crystal structure depending on its stacking order: 1T (metallic), 2H (semiconducting), and 3R (semiconducting). Among all of them, 1T-MoS2 has become the center of interest due to its e.g., high catalytic activity. However, most of the methods to obtain 1T-MoS2 are complex and costly, for example strain engineering, electron beam treatment, and plasmonic hot electron injection. As response, we here demonstrate a facile and cost-efficient hydrothermal route at 200 °C to synthesize MoS2 with high content of 1T phase. MoS2-200 °C nanoflowers has an average diameter of 2.96 µm with the S/Mo atomic ratio of 1.50 and the band gap of 1.39 eV. It has an additional diffraction peak at 2θ = 9.22o, indicating the transformation of semiconducting 2H into metallic 1T. Higher concentration of 1T phase in MoS2-200 °C is also indicated by high intensity of the E1g Raman peak.

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14

Emrinaldi, Tengku, Cuk Imawan, Riski Titian Ginting, and Vivi Fauzia. "Effect of Growth Time on the Structural and Morphological Properties of MoS₂ Synthesized via Hydrothermal Method." Materials Science Forum 1028 (April 2021): 162–67. http://dx.doi.org/10.4028/www.scientific.net/msf.1028.162.

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Recently, molybdenum disulfide (MoS2), have been explored as photothermal materials for solar evaporation. However, the optimum phase for photothermal material, 1T-MoS2 or 2H-MoS2, is still debatable. In this work, we observed the morphological and structural properties of MoS2 prepared by a simple hydrothermal process at 200 °C in three different growth times (16, 20, and 24 hours) using Na2MoO4·2H2O (sodium molybdate) as a Mo precursor, and CS(NH2)2 (thiourea) as S precursor. MoS2 nanoflowers were successfully prepared with nanosheets petals and its diameter increased from 0.4 to 2.8 and 4.5 as the growth time increased from 16 to 20 and 24 hours. The increase in growth time also led to improve the Mo:S ratio from 1:8 to 1:5 and facilitate the phase transformation from 1T to 2H as indicated by the shifting of (002) diffraction peak from 9.25° to higher degrees (12.98°, and 14.12°).

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15

Sivasankaran, Ramesh P., Nils Rockstroh, Carsten R. Kreyenschulte, Stephan Bartling, Henrik Lund, Amitava Acharjya, Henrik Junge, Arne Thomas, and Angelika Brückner. "Influence of MoS2 on Activity and Stability of Carbon Nitride in Photocatalytic Hydrogen Production." Catalysts 9, no. 8 (August 17, 2019): 695. http://dx.doi.org/10.3390/catal9080695.

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MoS2/C3N4 (MS-CN) composite photocatalysts have been synthesized by three different methods, i.e., in situ-photodeposition, sonochemical, and thermal decomposition. The crystal structure, optical properties, chemical composition, microstructure, and electron transfer properties were investigated by X-ray diffraction, UV-vis diffuse reflectance spectroyscopy, X-ray photoelectron spectroscopy, electron microscopy, photoluminescence, and in situ electron paramagnetic resonance spectroscopy. During photodeposition, the 2H MoS2 phase was formed upon reduction of [MoS4]2− by photogenerated conduction band electrons and then deposited on the surface of CN. A thin crystalline layer of 2H MoS2 formed an intimate interfacial contact with CN that favors charge separation and enhances the photocatalytic activity. The 2H MS-CN phase showed the highest photocatalytic H2 evolution rate (2342 μmol h−1 g−1, 25 mg catalyst/reaction) under UV-vis light irradiation in the presence of lactic acid as sacrificial reagent and Pt as cocatalyst.

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16

Jang, Kyuyeon, Yeong A. Lee, and Hana Yoon. "MoS₂—Carbon Materials Composite with Dual Phase of MoS₂ and Their Application for Anode of Lithium Ion Battery." ECS Meeting Abstracts MA2022-02, no. 7 (October 9, 2022): 2435. http://dx.doi.org/10.1149/ma2022-0272435mtgabs.

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Carbon materials such as graphite, graphene, and CNT are mainly used as anode materials for LIBs because of their wide surface area and excellent stability in Lithium Ion Battery operation. However, graphite, which is mainly used as an anode material, has a very low theoretical capacity of 372 mAh/g. As high-capacity LIBs are increasingly needed like electric vehicles, many studies are being conducted to increase LIB capacity. For example, research on Si anode materials is attracting attention, and Si has a high theoretical capacity of ~4200 mAh/g. However, since there is a fatal disadvantage of volume expansion in cycle performance, stability can be a major defect in the driving condition of LIB. Transition Metal Dichalgogenides (TMD) materials are attraction a lot of attention as various energy materials such as HER and ORR as well as LIB. Their structural characteristics, low price, and high capacity in terms of energy storage make them very attractive to study as a new anode material for LIB batteries. MoS2 belonging to the TMD material is known to have a theoretical capacity of 670 mAh/g. In particular, MoS2 has a single layer structure, and this single layer structure is coupled by weak van der walls force. These properties are very advantageous for exfoliating MoS2 to form a layer-by-layer form with other materials. MoS2 is known to have a typical 1T, 2H structure. However, MoS2, which exists in a stable phase, generally has a 2H structure and has semiconducting properties. Therefore, it is less conductive than graphene, which can be an obstacle to being used as an anode. MoS2 is known to have a typical 1T, 2H structure. However, MoS2, which exists in a stable phase, generally has a 2H structure and has semiconducting properties. Therefore, it is less conductive than graphene, which can be an obstacle to being used as an anode. 1T structure is known to have very good conductivity because it has conductive properties. Therefore, when used as an anode, it has many advantages in that it has conductivity, but since it is a metastable structure, it can be converted to 2H very easily, so it is not easy to maintain the structure. In this study, the synthesis of MoS2 and graphene composites was performed in one pot using a chemical exfoliation method. In addition, it was possible to stably maintain the metastable 1T structure of MoS2 by using graphene as a support material through a post-treatment process in this process. The diffusion of Li+ was promoted by having a 1T structure with a wide interfacial spacing and high conductivity, and superior conductivity and high capacity were stably maintained compared to a composite having a 2H single phase. Through this, a stable and high-capacity anode material was realized using the high energy storage capacity of MoS2 and the stability of graphene.

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17

Pinque, Marbert D, de Leon, and Rizalinda L. "Enhanced hydrogen production through visible light photocatalysis using 2D MoS2/2D CdS composite." World Journal of Advanced Engineering Technology and Sciences 8, no. 1 (February 28, 2023): 352–65. http://dx.doi.org/10.30574/wjaets.2023.8.1.0066.

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This study seeks to enhance the morphological face contact between 2D molybdenum disulfide (MoS2) nanosheets containing 1T and 2H phases (inhomogeneous) and 2D cadmium sulfide (CdS) sheets/flakes for enhanced charge transfer. The sulfides are synthesized by hydrothermal and solvothermal methods, respectively. MoS2/CdS composites (5, 10, 15, 20, 25 wt.% MoS2) are prepared using a physical method. The 2D forms and compositions of both materials are confirmed by FE-SEM imaging, XRD patterns, and XRF semi-quantitative analysis. XRD patterns also reveal the presence of 1T and 2H phases in MoS2 as well as the similar morphological and crystalline structures of the two sulfides. The adsorption of MoS2 onto the CdS surface has minimal intervention of the latter’s lattice structure as indicated by UV-Vis diffuse reflectance spectroscopy. A hydrogen production rate of 1036.1 µmol gcat-1 h-1 is observed using the 15 wt.% MoS2/CdS composite which was 159 times larger than bare CdS, with photocatalytic retention of about 80 % after 15 hours of use.

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18

Nualchimplee, Chakrit, Kulpavee Jitapunkul, Varisara Deerattrakul, Thammanoon Thaweechai, Weekit Sirisaksoontorn, Wisit Hirunpinyopas, and Pawin Iamprasertkun. "Auto-oxidation of exfoliated MoS₂ in N-methyl-2-pyrrolidone: from 2D nanosheets to 3D nanorods." New Journal of Chemistry 46, no. 2 (2022): 747–55. http://dx.doi.org/10.1039/d1nj05384a.

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We have therefore introduced a novel preparation route for MoO3 nanorods from exfoliated 2H-MoS2 via the auto-oxidation of a mixture of N-methyl-2-pyrrolidone and water via the sonication-assisted exfoliation of MoS2.

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19

Wang, Wenzhao, Xiangbin Zeng, Jamie H. Warner, Zhengyu Guo, Yishuo Hu, Yang Zeng, Jingjing Lu, et al. "Photoresponse-Bias Modulation of a High-Performance MoS2 Photodetector with a Unique Vertically Stacked 2H-MoS2/1T@2H-MoS2 Structure." ACS Applied Materials & Interfaces 12, no. 29 (June 25, 2020): 33325–35. http://dx.doi.org/10.1021/acsami.0c04048.

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20

Jing, Yuting, Ruijing Wang, Qiang Wang, and Xuefeng Wang. "Gold Nanoclusters Grown on MoS2 Nanosheets by Pulsed Laser Deposition: An Enhanced Hydrogen Evolution Reaction." Molecules 26, no. 24 (December 11, 2021): 7503. http://dx.doi.org/10.3390/molecules26247503.

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Au nanoparticles were decorated on a 2H MoS2 surface to form an Au/MoS2 composite by pulse laser deposition. Improved HER activity of Au/MoS2 is evidenced by a positively shifted overpotential (−77 mV) at a current density of −10 mA cm−2 compared with pure MoS2 nanosheets. Experimental evidence shows that the interface between Au and MoS2 provides more sites to combine protons to form an active H atom. The density functional theory calculations found that new Au active sites on the Au and MoS2 interface with improved conductivity of the whole system are essential for enhancing HER activity of Au/MoS2.

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21

Petrescu, M. I. "Theoretical hardness calculated from crystallo-chemical data for MoS2 and WS2 crystals and nanostructures." Acta Crystallographica Section B Structural Science 68, no. 5 (August 17, 2012): 501–10. http://dx.doi.org/10.1107/s0108768112033149.

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The calculation of the hardness of Mo and W disulfides using a crystallo-chemical model provides a unique opportunity to obtain separate quantitative information on the maximum hardness H max governed by strong intra-layer covalent bonds acting within the (0001) plane versus the minimum hardness H min governed by weak inter-layer van der Waals bonds acting along the c-axis of the hexagonal lattice. The penetration hardness derived from fundamental crystallo-chemical data (confirmed by experimental determinations) proved to be far lower in MS2 (M = Mo, W) than in graphite and hexagonal BN, both for H max (H graph/H MoS2 = 3.85; H graph/H WS2 = 3.60; H hBN/H MoS2 = 2.54; H hBN/HWS2 = 2.37) as well as for H min (H graph/H MoS2 = 6.22; H graph/H WS2 = 5.87; H hBN/H MoS2 = 4.72; H hBN/H WS2 = 4.46). However, the gap between H max and H min is considerably larger in MS2 (M = Mo,W), as indicated by H max/H min being 279 in 2H-MoS2, 282 in 2H-WS2, 173 in graphite and 150 in hBN. The gap was found to be even larger in MS2 (M = Mo, W) nanostructures. These findings help to explain the excellent properties of MS2 (M = Mo, W) as solid lubricants in high tech fields, either as bulk 2H crystals (inter-layer shear and peeling off lubricating mechanisms), or especially as onion-like fullerene nanoparticles (rolling/sliding mechanisms).

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Li, Qiuzhong, Lin Huang, Wenxin Dai, and Zizhong Zhang. "Controlling 1T/2H heterophase junctions in the MoS₂ microsphere for the highly efficient photocatalytic hydrogen evolution." Catalysis Science & Technology 11, no. 24 (2021): 7914–21. http://dx.doi.org/10.1039/d1cy01340h.

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23

Joe, Jemee, Changdeuck Bae, Eunsoo Kim, Thi Anh Ho, Heejun Yang, Jong Hyeok Park, and Hyunjung Shin. "Mixed-Phase (2H and 1T) MoS2 Catalyst for a Highly Efficient and Stable Si Photocathode." Catalysts 8, no. 12 (November 23, 2018): 580. http://dx.doi.org/10.3390/catal8120580.

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We describe the direct formation of mixed-phase (1T and 2H) MoS2 layers on Si as a photocathode via atomic layer deposition (ALD) for application in the photoelectrochemical (PEC) reduction of water to hydrogen. Without typical series-metal interfaces between Si and MoS2, our p-Si/SiOx/MoS2 photocathode showed efficient and stable operation in hydrogen evolution reactions (HERs). The resulting performance could be explained by spatially genuine device architectures in three dimensions (i.e., laterally homo and vertically heterojunction structures). The ALD-grown MoS2 overlayer with the mixed-phase 1T and 2H homojunction passivates light absorber and surface states and functions as a monolithic structure for effective charge transport within MoS2. It is also beneficial in the operation of p-i-n heterojunctions with inhomogeneous barrier heights due to the presence of mixed-phase cocatalysts. The effective barrier heights reached up to 0.8 eV with optimized MoS2 thicknesses, leading to a 670 mV photovoltage enhancement without employing buried Si p-n junctions. The fast-transient behaviors via light illumination show that the mixed-phase layered chalcogenides can serve as efficient cocatalysts by depinning the Fermi levels at the interfaces. A long-term operation of ~70 h was also demonstrated in a 0.5 M H2SO4 solution.

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24

Ahmadi, Zabihi, Li, Fakhrhoseini, and Naebe. "A Hydrothermal-Assisted Ball Milling Approach for Scalable Production of High-Quality Functionalized MoS2 Nanosheets for Polymer Nanocomposites." Nanomaterials 9, no. 10 (October 1, 2019): 1400. http://dx.doi.org/10.3390/nano9101400.

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The most known analogue of graphene, molybdenum disulfide (MoS2) nanosheet, has recently captured great interest because it can present properties beyond graphene in several high technological applications. Nonetheless, the lack of a feasible, sustainable, and scalable approach, in which synthesizing and functionalization of 2H-MoS2 nanosheets occur simultaneously, is still a challenge. Herein, a hydrothermal treatment has been utilised to reduce the effect of breaking mechanisms on the lateral size of produced nanosheets during the ball milling process. It was demonstrated that the hydrothermal pre-treatment led to the initial intercalation of an organic molecule such as 4,4’-diaminodiphenyl sulfone (DDS) within the stacked MoS2 sheets. Such a phenomenon can promote the horizontal shear forces and cause sliding and peeling mechanisms to be the dominated ones during low energy ball milling. Such combined methods can result in the production of 2H functionalized MoS2 nanosheets. The resultant few layers showed an average lateral dimension of more than 640 nm with the thickness as low as 6 nm and a surface area as high as 121.8 m2/g. These features of the synthesised MoS2 nanosheets, alongside their functional groups, can result in fully harnessing the reinforcing potential of MoS2 nanosheets for improvement of mechanical properties in different types of polymeric matrices.

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25

Ouyang, Tianwei, Jiaqing Guo, Haochen Shen, Manman Mu, Yongli Shen, and Xiaohong Yin. "The Z-scheme transfer of photogenerated electrons for CO₂ photocatalytic reduction over g-ZnO/2H-MoS₂ heterostructure." Nanoscale 13, no. 43 (2021): 18192–200. http://dx.doi.org/10.1039/d1nr05889d.

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26

Ouyang, Tianwei, Jiaqing Guo, Haochen Shen, Manman Mu, Yongli Shen, and Xiaohong Yin. "The Z-scheme transfer of photogenerated electrons for CO₂ photocatalytic reduction over g-ZnO/2H-MoS₂ heterostructure." Nanoscale 13, no. 43 (2021): 18192–200. http://dx.doi.org/10.1039/d1nr05889d.

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Al-Khaldi, Amal, Mohamed M. Fadlallah, Fawziah Alhajri, and Ahmed A. Maarouf. "Hybrid G/BN@2H-MoS2 Nanomaterial Composites: Structural, Electronic and Molecular Adsorption Properties." Nanomaterials 12, no. 24 (December 7, 2022): 4351. http://dx.doi.org/10.3390/nano12244351.

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Hybrid structures often possess superior properties to those of their component materials. This arises from changes in the structural or physical properties of the new materials. Here, we investigate the structural, electronic, and gas-adsorption properties of hybrid structures made from graphene/hexagonal boron nitride and 2H-molybdenum disulfide (G/BN@MoS2) monolayers. We consider hybrid systems in which the G/BN patch is at the Mo plane (model I) and the S plane (model II). We find that the implanted hexagon of G or BN in MoS2 alters its electronic properties: G@MoS2 (I,II) are metallic, while BN@MoS2 (I) is an n-type conducting and BN@MoS2 (II) is semiconducting. We study the molecular adsorption of some diatomic gases (H2, OH, N2, NO, CO), triatomic gases (CO2, NO2, H2S, SO2), and polyatomic gases (COOH, CH4, and NH3) on our hybrid structures while considering multiple initial adsorption sites. Our results suggest that the hybrid systems may be suitable materials for some applications: G@MOS2 (I) for oxygen reduction reactions, BN@MoS2 (I,II) for NH3-based hydrogen production, and G@MoS2 (I) and BN@MoS2 (I,II) for filtration of No, Co, SO2, H2S, and NO2.

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Abdelsalam, Hazem, Omar H. Abd-Elkader, Nouf S. Zaghloul, and Qinfang Zhang. "Magnetic and Electronic Properties of Edge-Modified Triangular WS2 and MoS2 Quantum Dots." Crystals 13, no. 2 (February 1, 2023): 251. http://dx.doi.org/10.3390/cryst13020251.

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The magnetic and electronic properties of zigzag-triangular WS2 and MoS2 quantum dots are investigated using density functional theory calculations. The pristine WS2 and MoS2 nanodots hold permanent spin on their edges which originates from the unpaired electrons of the transition metals at the edges. The ferromagnetic spin ordering in zigzag-triangular WS2 and MoS2 can be transformed to antiferromagnetic ordering with S = 0 and to nonmagnetic, respectively, by edge passivation with 2H. The calculations of the Curie Temperature indicate that these magnetic states are stable and withstand room temperature. The paramagnetic susceptibility of these structures significantly decreases by edge sulfuration. Moreover, it can be converted to diamagnetic susceptibility by edge passivation with 2H as found in WS2 nanodots. These structures are semiconductors with energy gaps of ~3.3 eV that decrease unexpectedly by edge passivation due to the existence of lone pairs from S atoms that give a high contribution to the low-energy molecular orbitals. With these preferable magnetic properties and controlled electronic ones, WS2 and MoS2 quantum dots are potential candidates for spintronic applications.

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Bozheyev, Farabi, Vladimir V. An, and Yuriy Irtegov. "Properties of Copper and Molybdenum Sulfide Powders Produced by Self-Propagating High-Temperature Synthesis." Advanced Materials Research 872 (December 2013): 191–96. http://dx.doi.org/10.4028/www.scientific.net/amr.872.191.

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Copper and molybdenum sulfide nanopowders were prepared by self-propagating high-temperature synthesis in argon. The initial copper powder and molybdenum powder were produced by electric spark dispersion in hexane and by electrical explosion of wires (EEW) in argon, respectively. The powders were studied by electron microscopy, X-ray diffraction and Raman spectroscopy. The copper sulfide main phase is hexagonal 2H-CuS, whereas hexagonal 2H-MoS2 and rhombohedral 3R-MoS2 are characteristic for molybdenum disulfide. The lattice parameters of copper and molybdenum sulfides were calculated. The average particle size of copper sulfide and molybdenum disulfide powders was about 50 nm and 80 nm, respectively.

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30

Ramos, Manuel, Oscar A. López-Galán, Javier Polanco, and Miguel José-Yacamán. "On the Electronic Structure of 2H-MoS2: Correlating DFT Calculations and In-Situ Mechanical Bending on TEM." Materials 15, no. 19 (September 28, 2022): 6732. http://dx.doi.org/10.3390/ma15196732.

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We present a systematic density functional theory study to determine the electronic structure of bending 2H-MoS2 layers up to 75° using information from in-situ nanoindentation TEM observations. The results from HOMO/LUMO and density of states plots indicate a metallic transition from the typical semiconducting phase, near Fermi energy level (EF) as a function of bending, which can mainly occur due to bending curvatures inducing a stretching and contracting of sulfur-sulfur chemical bonds located mostly over basal (001)-plane; furthermore, molybdenum ions play a major role in such transitions due to reallocation of their metallic d-character orbitals and the creation of “free electrons”, possibly having an overlap between Mo-dx2-y2 and Modz2 orbitals. This research on the metallic transition of 2H-MoS2 allows us to understand the high catalytic activity for MoS2 nanostructures as extensively reported in the literature.

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31

Xiong, Lei, Tianhong Tang, Xiaoyue Fan, Haiyang Liu, Peng Zhu, Xiaolan Zhang, Wei Qiao, et al. "Twist Angle-Dependent Interlayer Exciton in MoS2 Bilayers Revealed by Room-Temperature Reflectance." Crystals 12, no. 6 (May 25, 2022): 761. http://dx.doi.org/10.3390/cryst12060761.

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In 2H stacking bilayer MoS2, the exciton with an interlayer nature has been evidenced due to the hybridization of hole states among both layers. The transition energy of this interlayer exciton is located between the A and B excitons. In this work, we investigate the evolution of optical properties in stacking MoS2 bilayers with the twisted angles ranging from 0° to 60°, especially focusing on the interlayer exciton. The clear modulations of the exciton responses are observed by the room-temperature reflectance. The interlayer exciton transition is observed in the artificial stacking bilayer MoS2 with the twisted angle around 60°. We found that the interlayer exciton is very sensitive to the twisted angle. Once the stacking angle deviates the 2H stacking by a few degrees, the interlayer transition is quenched. This is due to the bilayer symmetry and interlayer coupling of this unique system.

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32

Sahu, Megha, Lakshmi Narasimhan, Ashok M. Raichur, Alexandru Sover, Romeo C. Ciobanu, Nicolae Lucanu, and Mihaela Aradoaei. "Improving Fracture Toughness of Tetrafunctional Epoxy with Functionalized 2D Molybdenum Disulfide Nanosheets." Polymers 13, no. 24 (December 17, 2021): 4440. http://dx.doi.org/10.3390/polym13244440.

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In this work, improved fracture toughness of tetra-functional epoxy polymer was obtained using two-dimensional (2H polytype) molybdenum disulfide (MoS2) nano-platelets as a filler. Simultaneous in-situ exfoliation and functionalization of MoS2 were achieved in the presence of cetyltrimethylammonium bromide (CTAB) via sonication. The aim was to improve the dispersion of MoS2 nanoplatelets in epoxy and enhance the interfacial interaction between nanoplatelets and epoxy matrix. Epoxy nanocomposites with CTAB functionalized MoS2 (f-MoS2) nanoplatelets, ranging in content from 0.1 wt% up to 1 wt%, were fabricated. Modified MoS2 improved the fracture properties (81%) of tetrafunctional epoxy nanocomposites. The flexural strength and compressive strength improved by 64% and 47%, respectively, with 0.25 wt% loading of f-MoS2 nanoplatelets compared to neat epoxy. The addition of f-MoS2 nanoplatelets enhanced the thermomechanical properties of epoxy. This work demonstrated the potential of organically modified MoS2 nanoplatelets for improving the fracture and thermal behavior of tetrafunctional epoxy nanocomposites.

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33

Jagminas, Arunas, Paulius Gaigalas, Carla Bittencourt, and Vaclovas Klimas. "Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction." Materials 14, no. 5 (March 2, 2021): 1165. http://dx.doi.org/10.3390/ma14051165.

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The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS2-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec−1, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS2-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS2/MoOx, C nanostructures with the dominant 1T-MoS2 phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS2 and MoO2) and semiconducting (2H-MoS2 and MoO3) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings.

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34

Wang, Kangli, Marco Kapitzke, Lauren Green, and Beate Paulus. "Modulating electronic and optical properties of monolayered MoS₂ by covalent mono- and bisfunctionalization." Journal of Materials Chemistry C 10, no. 15 (2022): 6009–16. http://dx.doi.org/10.1039/d2tc00391k.

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35

Kim, Seulgi, Woojin Park, Dohoon Kim, Jiyeon Kang, Jaesoung Lee, Hye Yeon Jang, Sung Ho Song, Byungjin Cho, and Dongju Lee. "Novel Exfoliation of High-Quality 2H-MoS2 Nanoflakes for Solution-Processed Photodetector." Nanomaterials 10, no. 6 (May 29, 2020): 1045. http://dx.doi.org/10.3390/nano10061045.

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Highly dispersive molybdenum disulfide nanoflakes (MoS2 NFs), without any phase transition during the exfoliation process, are desirable for full utilization of their semiconductor properties in practical applications. Here, we demonstrate an innovate approach for fabricating MoS2 NFs by using hydrazine-assisted ball milling via the synergetic effect of chemical intercalation and mechanical exfoliation. The NFs obtained have a lateral size of 600–800 nm, a thickness less than 3 nm, and high crystallinity in the 2H semiconducting phase. They form a stable dispersion in various solvents, which will be helpful for many applications, due to the oxygen functional group. To investigate production of a two-dimensional (2D) photodetector, 2D semiconducting MoS2, MoS2–p-Si vertical devices were fabricated, and their optical properties were characterized. The photodiode exhibited consistent responses with excellent photo-switching characteristics with wavelengths of 850, 530, and 400 nm.

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36

Das, Sarmistha, Gayatri Swain, and Kulamani Parida. "A concise discussion on MoS₂ basal plane activation toward the ennoblement of electrocatalytic HER output." Sustainable Energy & Fuels 6, no. 4 (2022): 937–53. http://dx.doi.org/10.1039/d1se01690c.

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37

Pagona, Georgia, Carla Bittencourt, Raul Arenal, and Nikos Tagmatarchis. "Exfoliated semiconducting pure 2H-MoS2 and 2H-WS2 assisted by chlorosulfonic acid." Chemical Communications 51, no. 65 (2015): 12950–53. http://dx.doi.org/10.1039/c5cc04689k.

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38

Cheng, Lehua, Enzhu Hu, Xianquan Chao, Renfa Zhu, Kunhong Hu, and Xianguo Hu. "MoS2/Montmorillonite Nanocomposite: Preparation, Tribological Properties, and Inner Synergistic Lubrication." Nano 13, no. 12 (December 2018): 1850144. http://dx.doi.org/10.1142/s1793292018501448.

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A nano-MoS2/montmorillonite K-10 (K10) composite was prepared and characterized. The composite contains two types of 2H-MoS2 nanoparticles. One is the hollow spherical MoS2 with a size range of 75[Formula: see text]nm, and the other is the spherical nano cluster of MoS2 with a size range of 30[Formula: see text]nm. The two kinds of nano-MoS2 were formed via assembly of numerous MoS2 nano-platelets with a size of [Formula: see text][Formula: see text]nm. A tribological comparison was then made among nano-MoS2/K10, K10, nano-MoS2 and a mechanical mixture of K10 and nano-MoS2. K10 reduced the wear but slightly increased the friction. Nano-MoS2 remarkably reduced both friction and wear. The mechanical mixture demonstrated better wear resistance than nano-MoS2, indicating a synergistic anti-wear effect of nano-MoS2 and K10. The synergistic effect was reinforced using nano-MoS2/K10 instead of the mechanical mixture. A part of the MoS2 in the contact region always lubricated the friction pair, and the rest formed a tribofilm. K10 segregated the friction pair to alleviate the ablation wear but magnified the abrasive wear. S-MoS2 protects K10 and they together function as both a lubricant and an isolating agent to reduce the ablation and abrasive wear.

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LIANG, L., Z. MO, N. LI, H. LIU, G. FENG, and A. WEI. "HYDROTHERMAL SYNTHESIS OF THE FLOWER-LIKE MoS2 NANOSHEETS MICROSPHERES AND ITS PHOTOCATALYTIC DEGRADATION OF METHYL ORANGE." Chalcogenide Letters 17, no. 11 (November 2020): 555–63. http://dx.doi.org/10.15251/cl.2020.1711.555.

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The flower-like MoS2 microspheres were synthesized via a facile hydrothermal method using Na2MoO4·2H2O, C2H2O4·2H2O, SC(NH2)2 and de-ionized water as precursors. The morphology and crystal structure of the MoS2 microspheres were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD). The as-prepared MoS2 microspheres were used as a catalyst for photocatalytic degradation of methyl orange. The effect of the size of the MoS2 microspheres and catalyst dosage amount on photocatalytic activity were investigated. The results indicate that the MoS2 powder consists of the flower-like nanosheet microspheres formed by several nanosheets gathered together perpendicular to the spherical surface, and the diameter of the MoS2 microspheres decreases with increasing the concentration of oxalic acid in the precursor. The MoS2 microspheres are with hexagonal 2H-MoS2 structure and preferentially grow along the (002) plane. It is found that the best photocatalytic degradation efficiency is 79.0% within irradiation time of 120 min under MoS2 dosage amount of 1.33 g/L and methyl orange concentration of 20mg/L.

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40

Wu, Qiaoling, Chun Ji, Lingli Zhang, Qili Shi, Yuangen Wu, and Han Tao. "A simple sensing platform based on a 1T@2H-MoS₂/cMWCNTs composite modified electrode for ultrasensitive detection of illegal Sudan I dye in food samples." Analytical Methods 14, no. 5 (2022): 549–59. http://dx.doi.org/10.1039/d1ay01775f.

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Анотація:

Based on the synergistic electrocatalysis effect of 1T@2H-MoS2 nanosheets and carboxylated carbon nanotubes (cMWCNTs), a simple electrochemical sensing platform was established for the highly sensitive detection of Sudan I.

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41

Politano, Grazia Giuseppina, Marco Castriota, Maria Penelope De Santo, Mario Michele Pipita, Giovanni Desiderio, Carlo Vena, and Carlo Versace. "Variable Angle Spectroscopic Ellipsometry Characterization of Spin-Coated MoS2 Films." Materials Proceedings 4, no. 1 (November 12, 2020): 86. http://dx.doi.org/10.3390/iocn2020-07978.

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Анотація:

In the field of Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted an outstanding interest due to it having several applications. MoS2 has potentialities not yet fully realized in solution-based applications. However, the lack of knowledge of the optical properties of MoS2, especially in the infrared range, has significantly limited its use in many exciting photonic fields. In this work, the broadband optical properties of MoS2 films deposited by spin-coating onto Si/SiO2 substrates were studied by means of Variable Angle Spectroscopic Ellipsometry (VASE). The morphological and the structural properties of the samples were investigated by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Micro-Raman Spectroscopy. Micro-Raman spectroscopy measurements reveal the presence of 2H-MoS2 and 1T-MoS2 phases. The optical properties of the films show a mid-gap state at 0.6 eV, not reported in an ellipsometry work before, induced by defects in the MoS2 samples.

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42

Sharma, Uttam, Smagul Karazhanov, Rajan Jose, and Santanu Das. "Plasmonic hot-electron assisted phase transformation in 2D-MoS₂ for the hydrogen evolution reaction: current status and future prospects." Journal of Materials Chemistry A 10, no. 16 (2022): 8626–55. http://dx.doi.org/10.1039/d1ta10918a.

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Анотація:

This review thoroughly discussed plasmonic hot electron-induced 2H to 1T phase transformation in 2D-MoS2 for its application as an effective electrocatalyst for the hydrogen evolution reaction with possible future challenges.

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43

Politano, Grazia Giuseppina, Marco Castriota, Maria Penelope De Santo, Mario Michele Pipita, Giovanni Desiderio, Carlo Vena, and Carlo Versace. "Physical Investigation of Spin-Coated MoS2 Films." Materials Proceedings 4, no. 1 (November 12, 2020): 3. http://dx.doi.org/10.3390/iocn2020-08005.

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Анотація:

Among emerging Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted a remarkable interest due to its many possible applications. In particular, MoS2 has potentialities not yet fully realized in solution-based applications. The morphological and the structural properties of MoS2 films deposited by spin-coating onto Si/SiO2 substrates were investigated by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Micro-Raman Spectroscopy. High resolution AFM imaging highlights the presence of a layered structure. The thickness of each layer is estimated to be around 13 nm. Micro-Raman measurements reveal that there is a coexistence between 2H-MoS2 and 1T-MoS2 phases, which could be useful for electrical applications. Moreover, the band at 290 cm−1 is assigned to the amorphous phase of MoS2. The detectability of the mode E1g in back scattering geometry is ascribed to the disorder of the amorphous phase.

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44

Yan, Zhishuo, Jixing Zhao, Qingsheng Gao, and Hao Lei. "A 2H-MoS2/carbon cloth composite for high-performance all-solid-state supercapacitors derived from a molybdenum dithiocarbamate complex." Dalton Transactions 50, no. 34 (2021): 11954–64. http://dx.doi.org/10.1039/d1dt01643a.

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Анотація:

A 2H-MoS2/CC composite is obtained by hydrothermal treatment and subsequent single-source pyrolysis of a Mo dithiocarbamate complex. The electrode is assembled into a high-performance symmetric all-solid-state supercapacitor.

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45

Le Ngoc, Long, Kien Pham Trung, and Khai Tran Van. "SYNTHESIS OF MoS2/GRAPHENE NANOCOMPOSITE BY FACILE ULTRASONIC-ASSISTED HYDROTHERMALMETHOD." Vietnam Journal of Science and Technology 57, no. 6 (November 20, 2019): 703. http://dx.doi.org/10.15625/2525-2518/57/6/13955.

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In this report, thin layers of MoS2 were in-situ incorporated into graphene oxide (GO) to form MoS2/graphene nanocomposite by a facile ultrasonic-assisted hydrothermal method. X-ray Diffraction (XRD) and Raman analysis revealed that the as-synthesized MoS2 nanosheets crystalized in hexagonal phase 2H-MoS2 while High Resolution Transmission Electron Microscopy (HRTEM) images confirmed that MoS2 layers with average thickness of ~5–6 nm (6–8 layers) attached on the edges and surfaces of graphene sheets with high density and uniform shape restacking in three-dimensional (3D) architectures. The Scanning Transmission Electron Microscopy – Energy Dispersive X-ray spectrum (STEM-EDX) investigation further confirmed the low impurity of MoS2/graphene composite, and the well repairing of defects in GO surfaces during the hydrothermal process. Our approach is promising for a scalable, inexpensive, and accurate strategy to fabricate state-of-the-art materials with a certain structure for various practical applications such as electrode material for Lithium battery or supercapacitor.

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46

Schankler, Aaron M., Lingyuan Gao, and Andrew M. Rappe. "Large Bulk Piezophotovoltaic Effect of Monolayer 2H-MoS2." Journal of Physical Chemistry Letters 12, no. 4 (January 26, 2021): 1244–49. http://dx.doi.org/10.1021/acs.jpclett.0c03503.

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47

Blue, Brandon T., Glenn G. Jernigan, Duy Le, Jose J. Fonseca, Stephanie D. Lough, Jesse E. Thompson, Darian D. Smalley, Talat S. Rahman, Jeremy T. Robinson, and Masahiro Ishigami. "Metallicity of 2H-MoS2 induced by Au hybridization." 2D Materials 7, no. 2 (February 5, 2020): 025021. http://dx.doi.org/10.1088/2053-1583/ab6d34.

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48

Lee, Choong Hee, Yuewei Zhang, Jared M. Johnson, Rachel Koltun, Vincent Gambin, John S. Jamison, Roberto C. Myers, Jinwoo Hwang, and Siddharth Rajan. "Molecular beam epitaxy of GaN on 2H–MoS2." Applied Physics Letters 117, no. 12 (September 21, 2020): 123102. http://dx.doi.org/10.1063/5.0012682.

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49

Li, Wang, Guihua Liu, Jingde Li, Yanji Wang, Luis Ricardez-Sandoval, Yongguang Zhang, and Zisheng Zhang. "Hydrogen evolution reaction mechanism on 2H-MoS2 electrocatalyst." Applied Surface Science 498 (December 2019): 143869. http://dx.doi.org/10.1016/j.apsusc.2019.143869.

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50

Backes, Claudia, Nina C. Berner, Xin Chen, Paul Lafargue, Pierre LaPlace, Mark Freeley, Georg S. Duesberg, Jonathan N. Coleman, and Aidan R. McDonald. "Functionalization of Liquid-Exfoliated Two-Dimensional 2H-MoS2." Angewandte Chemie International Edition 54, no. 9 (January 21, 2015): 2638–42. http://dx.doi.org/10.1002/anie.201409412.

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