Journal
SMALL
Volume 16, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201905892
Keywords
alloys; electron energy-loss spectroscopy; scanning transmission electron microscopy; thermal expansion coefficient; transition metal dichalcogenides
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Funding
- National Science Foundation [DMR-1831406, EFRI 2-DARE EFMA-1542864, DMREF CBET-1729420]
- NSF [ACI-1548562, DMREF-1729787, DMR-1626065]
- MRI-R2 grant from the National Science Foundation [DMR-0959470]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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2D materials, such as transition metal dichalcogenides (TMDs), graphene, and boron nitride, are seen as promising materials for future high power/high frequency electronics. However, the large difference in the thermal expansion coefficient (TEC) between many of these 2D materials could impose a serious challenge for the design of monolayer-material-based nanodevices. To address this challenge, alloy engineering of TMDs is used to tailor their TECs. Here, in situ heating experiments in a scanning transmission electron microscope are combined with electron energy-loss spectroscopy and first-principles modeling of monolayer Mo1-xWxS2 with different alloying concentrations to determine the TEC. Significant changes in the TEC are seen as a function of chemical composition in Mo1-xWxS2, with the smallest TEC being reported for a configuration with the highest entropy. This study provides key insights into understanding the nanoscale phenomena that control TEC values of 2D materials.
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