2021 Fiscal Year Final Research Report
Effect of interaction with external molecules on CDW phase transition of two-dimensional 1T-TaS2
Project/Area Number |
19K15395
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 28030:Nanomaterials-related
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Research Institution | Tokyo Denki University (2021) Hosei University (2019-2020) |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 2次元物質 / 遷移金属ダイカルコゲナイド / CDW相転移 / ガス吸着 / 水素センサ |
Outline of Final Research Achievements |
Tantalum disulfide (1T-TaS2) is known as a two-dimensional material. The thin film of the 1T-TaS2 exhibits charge density wave (CDW) phase transition behavior, but the behavior is different from that of the bulk 1T-TaS2. In the thin layer, the adsorbed molecules on the surface have a great influence on the CDW phase transition, but the mechanism of the CDW phase transition in the thin film is unknown. In order to elucidate the mechanism, change in conductivity of each CDW phase when hydrogen molecules were adsorbed on the surface of 1T-TaS2 was investigated. The change in the electrical conductivity differs between the ICCDW phase at 500 K and the NCCDW phase at 350 K when hydrogen molecules are adsorbed, indicating that the effect of the adsorbed molecules on the surface differs between the ICCDW phase and the NCCDW phase.
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Free Research Field |
材料物性
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Academic Significance and Societal Importance of the Research Achievements |
薄層のCDW相転移現象において吸着分子の影響を調べた研究例はこれまでに報告されていない.今回の成果は,吸着分子の影響がCDW相の違いによって異なることを示しており,今後は他の分子吸着の影響や,基板の影響などを調べることによって,薄層のCDW相転移のメカニズムの解明に繋がることが期待される.またこの成果によってCDW相転移の基本原理の解明だけでなく,分子吸着による電気伝導性変化を利用したガスセンサ等の応用などにも繋がることが期待される.
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