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10 pages, 6041 KB

Open AccessArticle

Investigating the Effects of Long-Term Ambient Air Storage on the Sliding Properties of N-Alloyed MoSe₂ Coatings

by Talha Bin Yaqub, Irfan Nadeem, Muhammad Aneeq Haq, Muhammad Yasir, Albano Cavaleiro and Mitjan Kalin

Nanomaterials 2025, 15(6), 414; https://doi.org/10.3390/nano15060414 - 7 Mar 2025

Cited by 2 | Viewed by 1298

Abstract

Transition metal dichalcogenide coatings have emerged as potential candidates for terrestrial and aerospace mobility applications. Among these, the alloyed MoSe₂ coatings have displayed promising results while sliding in diverse environments. N-alloyed Mose₂ coatings provide the additional benefit of overcoming the impact of PVD compositional variations on dry sliding, making them promising solid lubricants for mobility-sector applications. However, the impact of long-term storage has never been investigated for this rarely studied solid-lubricant system. This study investigates the tribological performance of direct current magnetron sputtered MoSeN coatings after 40 months of storage in an ambient atmosphere. Sliding tests were conducted under conditions consistent with pre-storage conditions. The results showed that coatings with 0 at. %, 22 at. %, 33 at. %, and 35 at. % N-alloying exhibited COF values nearly identical to the pre-storage results, with only a negligible increase in ~0.01. Similarly, all coatings displayed specific wear rates in the range of 10⁻⁷, aligning with earlier findings. The obtained results show that the sliding performance of MoSeN coatings does not deteriorate over time, highlighting their suitability for critical aerospace applications, where components and assembled parts may be stored for years before launching into space or in actual applications. Full article

(This article belongs to the Special Issue Design and Applications of Heterogeneous Nanostructured Materials)

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13 pages, 4907 KB

Open AccessArticle

Tribological Comparison of Coatings Produced by PVD Sputtering for Application on Combustion Piston Rings

by Ney Francisco Ferreira, Filipe Fernandes, Patric Daniel Neis, Jean Carlos Poletto, Talha Bin Yaqub, Albano Cavaleiro, Luis Vilhena and Amilcar Ramalho

Coatings 2024, 14(9), 1109; https://doi.org/10.3390/coatings14091109 - 2 Sep 2024

Cited by 4 | Viewed by 3080

Abstract

This article compares the tribological performance of coatings produced by PVD sputtering. Transition metal dichalcogenide (TMD) coatings doped with carbon (WSC and MoSeC) and nitrogen (WSN and MoSeN) and a conventional diamond-like carbon (DLC) coating are compared. The tribological evaluation was oriented towards the use of coatings on piston rings. Block-on-ring tests in a condition lubricated with an additive-free polyalphaolefin (PAO 8) and at temperatures of 30, 60, and 100 °C were carried out to evaluate the coatings in boundary lubrication conditions. A load scanner test was used to evaluate dry friction and scuffing propensity. In addition to WSN, all other TMD coatings (WSC, MoSeC, and MoSeN) exhibited lower friction than DLC in dry and lubricated conditions. The study reveals that WSC, among TMD coatings, offers promising results, with significantly lower friction levels than DLC, while demonstrating reduced wear and a lower risk of metal adhesion. These findings suggest that WSC may be a viable alternative to DLC in piston rings, with potential benefits for reducing fuel consumption and increasing engine durability. Full article

(This article belongs to the Special Issue Advanced Coating Technology by Physical Vapor Deposition and Applications)

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2 pages, 187 KB

Open AccessAbstract

Recent Progress toward the Development of TMD-Based Industrial Dry Lubricants for Multi-Environment Sliding

by Talha Bin Yaqub, Abbas Al-Rjoub, Filipe Fernandes and Albano Cavaleiro

Mater. Proc. 2022, 8(1), 20; https://doi.org/10.3390/materproc2022008020 - 20 May 2022

Cited by 1 | Viewed by 1655

Abstract

Transition metal dichalcogenides (TMDs) sputtered coatings are promising dry lubricants for dry and vacuum environments [...] Full article

(This article belongs to the Proceedings of MATERIAIS 2022)

14 pages, 3336 KB

Open AccessArticle

Preparation and Characterization of Thin-Film Solar Cells with Ag/C₆₀/MAPbI₃/CZTSe/Mo/FTO Multilayered Structures

by Tsung-Wen Chang, Chzu-Chiang Tseng, Dave W. Chen, Gwomei Wu, Chia-Ling Yang and Lung-Chien Chen

Molecules 2021, 26(12), 3516; https://doi.org/10.3390/molecules26123516 - 9 Jun 2021

Cited by 7 | Viewed by 4717

Abstract

New solar cells with Ag/C₆₀/MAPbI₃/Cu₂ZnSnSe₄ (CZTSe)/Mo/FTO multilayered structures on glass substrates have been prepared and investigated in this study. The electron-transport layer, active photovoltaic layer, and hole-transport layer were made of C₆₀, CH₃NH₃PbI₃ (MAPbI₃) perovskite, and CZTSe, respectively. The CZTSe hole-transport layers were deposited by magnetic sputtering, with the various thermal annealing temperatures at 300 °C, 400 °C, and 500 °C, and the film thickness was also varied at 50~300 nm The active photovoltaic MAPbI₃ films were prepared using a two-step spin-coating method on the CZTSe hole-transport layers. It has been revealed that the crystalline structure and domain size of the MAPbI₃ perovskite films could be substantially improved. Finally, n-type C₆₀ was vacuum-evaporated to be the electronic transport layer. The 50 nm C₆₀ thin film, in conjunction with 100 nm Ag electrode layer, provided adequate electron current transport in the multilayered structures. The solar cell current density–voltage characteristics were evaluated and compared with the thin-film microstructures. The photo-electronic power-conversion efficiency could be improved to 14.2% when the annealing temperature was 500 °C and the film thickness was 200 nm. The thin-film solar cell characteristics of open-circuit voltage, short-circuit current density, fill factor, series-resistance, and Pmax were found to be 1.07 V, 19.69 mA/cm², 67.39%, 18.5 Ω and 1.42 mW, respectively. Full article

(This article belongs to the Special Issue Nanomaterials for Solar Cells)

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12 pages, 1180 KB

Open AccessArticle

Fabrication of CIS Absorber Layers with Different Thicknesses Using A Non-Vacuum Spray Coating Method

by Chien-Chen Diao, Hsin-Hui Kuo, Wen-Cheng Tzou, Yen-Lin Chen and Cheng-Fu Yang

Materials 2014, 7(1), 206-217; https://doi.org/10.3390/ma7010206 - 3 Jan 2014

Cited by 14 | Viewed by 7202

Abstract

In this study, a new thin-film deposition process, spray coating method (SPM), was investigated to deposit the high-densified CuInSe₂ absorber layers. The spray coating method developed in this study was a non-vacuum process, based on dispersed nano-scale CuInSe₂ precursor and could offer a simple, inexpensive, and alternative formation technology for CuInSe₂ absorber layers. After spraying on Mo/glass substrates, the CuInSe₂ thin films were annealed at 550 °C by changing the annealing time from 5 min to 30 min in a selenization furnace, using N₂ as atmosphere. When the CuInSe₂ thin films were annealed, without extra Se or H₂Se gas used as the compensation source during the annealing process. The aim of this project was to investigate the influence of annealing time on the densification and crystallization of the CuInSe₂ absorber layers to optimize the quality for cost effective solar cell production. The thickness of the CuInSe₂ absorber layers could be controlled as the volume of used dispersed CuInSe₂-isopropyl alcohol solution was controlled. In this work, X-ray diffraction patterns, field emission scanning electron microscopy, and Hall parameter measurements were performed in order to verify the quality of the CuInSe₂ absorber layers obtained by the Spray Coating Method. Full article

(This article belongs to the Special Issue Solar Energy Materials 2013)

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