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Wafer-Scale Growth of 2D PtTe2 with Layer Orientation Tunable High Electrical Conductivity and Superior Hydrophobicity
NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.
NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States.
NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States. Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida 32816, United States.
NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States. Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea.
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2020 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 12, no 9, p. 10839-10851Article in journal (Refereed) Published
Abstract [en]

Platinum ditelluride (PtTe2) is an emerging semimetallic two-dimensional (2D) transition-metal dichalcogenide (TMDC) crystal with intriguing band structures and unusual topological properties. Despite much devoted efforts, scalable and controllable synthesis of large-area 2D PtTe2 with well-defined layer orientation has not been established, leaving its projected structure–property relationship largely unclarified. Herein, we report a scalable low-temperature growth of 2D PtTe2 layers on an area greater than a few square centimeters by reacting Pt thin films of controlled thickness with vaporized tellurium at 400 °C. We systematically investigated their thickness-dependent 2D layer orientation as well as its correlated electrical conductivity and surface property. We unveil that 2D PtTe2 layers undergo three distinct growth mode transitions, i.e., horizontally aligned holey layers, continuous layer-by-layer lateral growth, and horizontal-to-vertical layer transition. This growth transition is a consequence of competing thermodynamic and kinetic factors dictated by accumulating internal strain, analogous to the transition of Frank–van der Merwe (FM) to Stranski–Krastanov (SK) growth in epitaxial thin-film models. The exclusive role of the strain on dictating 2D layer orientation has been quantitatively verified by the transmission electron microscopy (TEM) strain mapping analysis. These centimeter-scale 2D PtTe2 layers exhibit layer orientation tunable metallic transports yielding the highest value of ∼1.7 × 106 S/m at a certain critical thickness, supported by a combined verification of density functional theory (DFT) and electrical measurements. Moreover, they show intrinsically high hydrophobicity manifested by the water contact angle (WCA) value up to ∼117°, which is the highest among all reported 2D TMDCs of comparable dimensions and geometries. Accordingly, this study confirms the high material quality of these emerging large-area 2D PtTe2 layers, projecting vast opportunities employing their tunable layer morphology and semimetallic properties from investigations of novel quantum phenomena to applications in electrocatalysis.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020. Vol. 12, no 9, p. 10839-10851
Keywords [en]
2D material, platinum ditelluride, PtTe2, vertically aligned layers, hydrophobic, electrical conductivity
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Other Physics Topics
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Applied Physics
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URN: urn:nbn:se:ltu:diva-78326DOI: 10.1021/acsami.9b21838ISI: 000518702300080PubMedID: 32043876Scopus ID: 2-s2.0-85080031490OAI: oai:DiVA.org:ltu-78326DiVA, id: diva2:1421477
Note

Validerad;2020;Nivå 2;2020-04-03 (alebob)

Available from: 2020-04-03 Created: 2020-04-03 Last updated: 2020-04-03Bibliographically approved

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Larsson, J. Andreas

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