Nanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO 3

Handle URI:
http://hdl.handle.net/10754/621627
Title:
Nanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO 3
Authors:
Li, Yangyang ( 0000-0003-4469-0659 ) ; Wang, Qingxiao; An, Ming; Li, Kun; Wehbe, Nimer; Zhang, Qiang; Dong, Shuai; Wu, Tao ( 0000-0003-0845-4827 )
Abstract:
Metal/oxide interfaces are ubiquitous in a wide range of applications such as electronics, photovoltaics, memories, catalysis, and sensors. However, there have been few investigations dedicated to the nanoscale structural and chemical characteristics of these buried interfaces. In this work, the metal/oxide interface between Ti and SrTiO3 (STO) is examined as a prototypical system using high-resolution scanning transmission electron microscopy and electron energy loss spectroscopy. An atomic-thin Ti2O3-like layer at the Ti/STO interface prepared at room temperature is discovered, and first-principles calculations predict a metallic band structure of this 2D electron system. As a universal feature of such interfaces prepared at different temperatures, near the interface nanoscale oxygen-deficient domains and continuous modulation of Ti oxidation states are found. Overall, these results directly reveal complex chemical and valence evolutions at the metal/oxide interfaces, providing microscopic insights on such heterostructures. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
KAUST Department:
Materials Science and Engineering Program; Imaging & Characterization Core Lab; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia
Citation:
Li Y, Wang Q, An M, Li K, Wehbe N, et al. (2016) Nanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO 3 . Advanced Materials Interfaces 3: 1600201. Available: http://dx.doi.org/10.1002/admi.201600201.
Publisher:
Wiley-Blackwell
Journal:
Advanced Materials Interfaces
Issue Date:
27-Jun-2016
DOI:
10.1002/admi.201600201
Type:
Article
ISSN:
2196-7350
Sponsors:
This work was supported by the King Abdullah University of Science and Technology (KAUST). M.A. and S.D. were supported by the National Natural Science Foundation (Grant No. 11274060). The experiments were performed in the Nanofabrication & Thin Film core lab, and the Imaging & Characterization Core Lab in KAUST.
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Yangyangen
dc.contributor.authorWang, Qingxiaoen
dc.contributor.authorAn, Mingen
dc.contributor.authorLi, Kunen
dc.contributor.authorWehbe, Nimeren
dc.contributor.authorZhang, Qiangen
dc.contributor.authorDong, Shuaien
dc.contributor.authorWu, Taoen
dc.date.accessioned2016-11-03T13:21:17Z-
dc.date.available2016-11-03T13:21:17Z-
dc.date.issued2016-06-27en
dc.identifier.citationLi Y, Wang Q, An M, Li K, Wehbe N, et al. (2016) Nanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO 3 . Advanced Materials Interfaces 3: 1600201. Available: http://dx.doi.org/10.1002/admi.201600201.en
dc.identifier.issn2196-7350en
dc.identifier.doi10.1002/admi.201600201en
dc.identifier.urihttp://hdl.handle.net/10754/621627-
dc.description.abstractMetal/oxide interfaces are ubiquitous in a wide range of applications such as electronics, photovoltaics, memories, catalysis, and sensors. However, there have been few investigations dedicated to the nanoscale structural and chemical characteristics of these buried interfaces. In this work, the metal/oxide interface between Ti and SrTiO3 (STO) is examined as a prototypical system using high-resolution scanning transmission electron microscopy and electron energy loss spectroscopy. An atomic-thin Ti2O3-like layer at the Ti/STO interface prepared at room temperature is discovered, and first-principles calculations predict a metallic band structure of this 2D electron system. As a universal feature of such interfaces prepared at different temperatures, near the interface nanoscale oxygen-deficient domains and continuous modulation of Ti oxidation states are found. Overall, these results directly reveal complex chemical and valence evolutions at the metal/oxide interfaces, providing microscopic insights on such heterostructures. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheimen
dc.description.sponsorshipThis work was supported by the King Abdullah University of Science and Technology (KAUST). M.A. and S.D. were supported by the National Natural Science Foundation (Grant No. 11274060). The experiments were performed in the Nanofabrication & Thin Film core lab, and the Imaging & Characterization Core Lab in KAUST.en
dc.publisherWiley-Blackwellen
dc.subjectelectron energy loss spectrumen
dc.subjectfirst-principles calculationen
dc.subjectinterfacesen
dc.subjectoxygen vacanciesen
dc.subjectSrTiO 3en
dc.titleNanoscale Chemical and Valence Evolution at the Metal/Oxide Interface: A Case Study of Ti/SrTiO 3en
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentImaging & Characterization Core Lab; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabiaen
dc.identifier.journalAdvanced Materials Interfacesen
dc.contributor.institutionDepartment of Materials Science and Engineering; University of Texas at Dallas; 800 W. Campbell Rd. RL10 Richardson TX 75080 USAen
dc.contributor.institutionDepartment of Physics; Southeast University; Nanjing 211189 Chinaen
kaust.authorLi, Yangyangen
kaust.authorLi, Kunen
kaust.authorWehbe, Nimeren
kaust.authorZhang, Qiangen
kaust.authorWu, Taoen
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