Daniela Lucio-Rosales, David Torres-Torres, Alejandra Garcia-Garcia
{"title":"A focused study of the out-plane mechanical properties and the spiral growth of MoS2 structures","authors":"Daniela Lucio-Rosales, David Torres-Torres, Alejandra Garcia-Garcia","doi":"10.1016/j.surfcoat.2025.132034","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the growth and mechanical properties of MoS<sub>2</sub> structures deposited on a Si/SiO<sub>2</sub> substrate via Chemical Vapor Deposition (CVD). The MoS<sub>2</sub> structures exhibit distinct triangular shapes with spiral growth patterns, indicative of strong substrate-layer interactions facilitated by screw dislocations. The initiation of spiral growth is influenced by substrate characteristics, which serve as active sites for layer-by-layer deposition. Raman spectroscopy revealed peaks at 176 cm<sup>−1</sup> (<em>A</em><sub><em>1g</em></sub>(<em>M</em>) + <em>LA</em>(<em>M</em>)) and 228 cm<sup>−1</sup> (<em>LA</em>(<em>M</em>)), signifying structural integrity of the MoS<sub>2</sub> layers. Key vibrational modes such as <em>E</em><sup><em>1</em></sup><sub><em>2g</em></sub> at 383 cm<sup>−1</sup> and <em>A</em><sub><em>1g</em></sub> at 408 cm<sup>−1</sup> were associated with in-plane and out-plane dynamics, respectively. Variations in peak positions and their relative intensities can provide information about the presence of a few or multi-layer MoS<sub>2</sub>. Additional peaks at 418 cm<sup>−1</sup>, 454 cm<sup>−1</sup> (2<em>LA</em>), and 465 cm<sup>−1</sup> (<em>A</em><sub>2<em>u</em></sub>) suggested complex vibrational interactions in multilayer configurations. Atomic Force Microscopy (AFM) confirmed the spiral growth morphology of MoS<sub>2</sub> structures. Mechanical properties evaluated by nanoindentation revealed both elastic and elastoplastic behavior, with screw dislocations contributing to enhanced deformability and toughness. These results underscore the substantial impact of growth mechanisms on the mechanical properties of MoS<sub>2</sub> films, demonstrating their potential for applications in flexible electronics and energy absorption systems.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"504 ","pages":"Article 132034"},"PeriodicalIF":5.3000,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface & Coatings Technology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0257897225003081","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigates the growth and mechanical properties of MoS2 structures deposited on a Si/SiO2 substrate via Chemical Vapor Deposition (CVD). The MoS2 structures exhibit distinct triangular shapes with spiral growth patterns, indicative of strong substrate-layer interactions facilitated by screw dislocations. The initiation of spiral growth is influenced by substrate characteristics, which serve as active sites for layer-by-layer deposition. Raman spectroscopy revealed peaks at 176 cm−1 (A1g(M) + LA(M)) and 228 cm−1 (LA(M)), signifying structural integrity of the MoS2 layers. Key vibrational modes such as E12g at 383 cm−1 and A1g at 408 cm−1 were associated with in-plane and out-plane dynamics, respectively. Variations in peak positions and their relative intensities can provide information about the presence of a few or multi-layer MoS2. Additional peaks at 418 cm−1, 454 cm−1 (2LA), and 465 cm−1 (A2u) suggested complex vibrational interactions in multilayer configurations. Atomic Force Microscopy (AFM) confirmed the spiral growth morphology of MoS2 structures. Mechanical properties evaluated by nanoindentation revealed both elastic and elastoplastic behavior, with screw dislocations contributing to enhanced deformability and toughness. These results underscore the substantial impact of growth mechanisms on the mechanical properties of MoS2 films, demonstrating their potential for applications in flexible electronics and energy absorption systems.
期刊介绍:
Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance:
A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting.
B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.