Direct Measurement of the Thermal Expansion Coefficient of Epitaxial WSe2 by Four-Dimensional Scanning Transmission Electron Microscopy
Source abstract
Abstract
High Resolution Image Download MS PowerPoint Slide Current reports of thermal expansion coefficients (TEC) of two-dimensional (2D) materials show large discrepancies that span orders of magnitude. Determining the TEC of any 2D material remains difficult due to approaches involving indirect measurement of samples that are atomically thin and optically transparent. We demonstrate a methodology to address this discrepancy and directly measure TEC of nominally monolayer epitaxial WSe 2 using four-dimensional scanning transmission electron microscopy (4D-STEM). Experimentally, WSe 2 from metal–organic chemical vapor deposition (MOCVD) was heated through a temperature range of 18–564 °C using a barrel-style heating sample holder to observe temperature-induced structural changes without additional alterations or destruction of the sample. By combining 4D-STEM measurements with quantitative structural analysis, the thermal expansion coefficient of nominally monolayer polycrystalline epitaxial 2D WSe 2 was determined to be (3.5 ± 0.9) × 10 –6 K –1 and (5.7 ± 2) × 10 –5 K –1 for the in- and out-of-plane TEC, respectively, and (3.6 ± 0.2) × 10 –5 K –1 for the unit cell volume TEC, in good agreement with historically determined values for bulk crystals.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: 2D Materials and Applications · Advanced Thermoelectric Materials and Devices · Machine Learning in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
Nuclear Materials Science Group (MST-16), Materials and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
National Center for Electron Microscopy (NCEM), The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
Physics and Chemistry of Materials Group (T-1), Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
Electrochemistry and Corrosion Team, Sigma Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
Department of Electrical & Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
Funding
Los Alamos National Laboratory · Basic Energy Sciences · National Research Foundation of Korea · Laboratory Directed Research and Development
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