{"title":"仪器传感器用TiS2/WS2层状异质结材料的应变工程:DFT研究","authors":"Yang Zhou","doi":"10.1016/j.chemphys.2025.112950","DOIUrl":null,"url":null,"abstract":"<div><div>Two-dimensional nanomaterials, due to their excellent and tunable optoelectronic properties, show broad prospects in the field of smart musical instrument sensors. In this study, first-principles calculations were employed to systematically investigate the structural, electronic, and optical properties of TiS<sub>2</sub>/WS<sub>2</sub> layered heterojunctions, including TiS<sub>2</sub>/WS<sub>2</sub>, TiS<sub>2</sub>/WS<sub>2</sub>/TiS<sub>2</sub>, and WS<sub>2</sub>/TiS<sub>2</sub>/WS<sub>2</sub>. The results indicate that all three heterojunctions are indirect bandgap semiconductors, with bandgaps of 0.358 eV, 0.097 eV, and 0.122 eV, respectively. Significant charge transfer occurs at the heterojunction interfaces, with electrons directionally migrating from the WS<sub>2</sub> layer to the TiS<sub>2</sub> layer, and the transferred charge ranging from 0.27 |e| to 0.41 |e|. Strain effectively modulates the bandgap; when a 6 % tensile strain is applied, all systems transition to a metallic state. Optical analysis reveals that the TiS<sub>2</sub>/WS<sub>2</sub>/TiS<sub>2</sub> heterojunction exhibits an absorption coefficient as high as 1.82 × 10<sup>5</sup> cm<sup>−1</sup>, and strain can induce a blue shift (compression) or red shift (tension) of the absorption peaks. This work significantly advances the application of two-dimensional materials in smart cello instruments.</div></div>","PeriodicalId":272,"journal":{"name":"Chemical Physics","volume":"601 ","pages":"Article 112950"},"PeriodicalIF":2.4000,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Strain engineering of TiS2/WS2 layered heterojunction materials for instrument sensors: A DFT study\",\"authors\":\"Yang Zhou\",\"doi\":\"10.1016/j.chemphys.2025.112950\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Two-dimensional nanomaterials, due to their excellent and tunable optoelectronic properties, show broad prospects in the field of smart musical instrument sensors. In this study, first-principles calculations were employed to systematically investigate the structural, electronic, and optical properties of TiS<sub>2</sub>/WS<sub>2</sub> layered heterojunctions, including TiS<sub>2</sub>/WS<sub>2</sub>, TiS<sub>2</sub>/WS<sub>2</sub>/TiS<sub>2</sub>, and WS<sub>2</sub>/TiS<sub>2</sub>/WS<sub>2</sub>. The results indicate that all three heterojunctions are indirect bandgap semiconductors, with bandgaps of 0.358 eV, 0.097 eV, and 0.122 eV, respectively. Significant charge transfer occurs at the heterojunction interfaces, with electrons directionally migrating from the WS<sub>2</sub> layer to the TiS<sub>2</sub> layer, and the transferred charge ranging from 0.27 |e| to 0.41 |e|. Strain effectively modulates the bandgap; when a 6 % tensile strain is applied, all systems transition to a metallic state. Optical analysis reveals that the TiS<sub>2</sub>/WS<sub>2</sub>/TiS<sub>2</sub> heterojunction exhibits an absorption coefficient as high as 1.82 × 10<sup>5</sup> cm<sup>−1</sup>, and strain can induce a blue shift (compression) or red shift (tension) of the absorption peaks. This work significantly advances the application of two-dimensional materials in smart cello instruments.</div></div>\",\"PeriodicalId\":272,\"journal\":{\"name\":\"Chemical Physics\",\"volume\":\"601 \",\"pages\":\"Article 112950\"},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2025-09-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemical Physics\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0301010425003519\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Physics","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301010425003519","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Strain engineering of TiS2/WS2 layered heterojunction materials for instrument sensors: A DFT study
Two-dimensional nanomaterials, due to their excellent and tunable optoelectronic properties, show broad prospects in the field of smart musical instrument sensors. In this study, first-principles calculations were employed to systematically investigate the structural, electronic, and optical properties of TiS2/WS2 layered heterojunctions, including TiS2/WS2, TiS2/WS2/TiS2, and WS2/TiS2/WS2. The results indicate that all three heterojunctions are indirect bandgap semiconductors, with bandgaps of 0.358 eV, 0.097 eV, and 0.122 eV, respectively. Significant charge transfer occurs at the heterojunction interfaces, with electrons directionally migrating from the WS2 layer to the TiS2 layer, and the transferred charge ranging from 0.27 |e| to 0.41 |e|. Strain effectively modulates the bandgap; when a 6 % tensile strain is applied, all systems transition to a metallic state. Optical analysis reveals that the TiS2/WS2/TiS2 heterojunction exhibits an absorption coefficient as high as 1.82 × 105 cm−1, and strain can induce a blue shift (compression) or red shift (tension) of the absorption peaks. This work significantly advances the application of two-dimensional materials in smart cello instruments.
期刊介绍:
Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal.