Suppression of the Charge Density Wave State in Two‐Dimensional 1T‐TiSe2 by Atmospheric Oxidation. Issue 31 (27th June 2017)

• Record Type: Journal Article
• Authors: Sun, Lifei; Chen, Chuanhui; Zhang, Qinghua; Sohrt, Christian; Zhao, Tianqi; Xu, Guanchen; Wang, Jinghui; Wang, Dong; Rossnagel, Kai; Gu, Lin; Tao, Chenggang; Jiao, Liying
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 31(2017)
• Page Start: 8981
• Page End: 8985
• Publication Date: 2017-06-27
• Subjects: charge density wave materials -- oxidation mechanism -- TiSe2 -- two-dimensional atomic crystals; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201612605
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Two‐dimensional (2D) metallic transition‐metal dichalcogenides (TMDCs), such as 1 T ‐TiSe2, have recently emerged as unique platforms for exploring their exciting properties of superconductivity and the charge density wave (CDW). 2D 1 T ‐TiSe2 undergoes rapid oxidation under ambient conditions, significantly affecting its CDW phase‐transition behavior. We comprehensively investigate the oxidation process of 2D TiSe2 by tracking the evolution of the chemical composition and atomic structure with various microscopic and spectroscopic techniques and reveal its unique selenium‐assisting oxidation mechanism. Our findings facilitate a better understanding of the chemistry of ultrathin TMDCs crystals, introduce an effective method to passivate their surfaces with capping layers, and thus open a way to further explore the functionality of these materials toward devices. Abstract : The oxidation behavior and the effect of the oxidation on the charge density wave transition behavior of two‐dimensional TiSe2 is revealed (see picture; Ti purple, Se yellow, O blue). This provides important insights into the oxidation mechanism of ultrathin layered materials, and paves the way for exploiting the unusual properties of these materials.