Journal
NANO LETTERS
Volume 17, Issue 9, Pages 5329-5334Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01735
Keywords
Adhesion; MoS2; adhesion hysteresis; Young's modulus; friction; bubble
Categories
Funding
- National Science Foundation (NSF) [1054406]
- NSF Graduate Research Fellowship Program [DGE-1247312]
- BUnano Cross-Disciplinary Fellowship
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1054406] Funding Source: National Science Foundation
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We measured the work of separation of single and few layer MoS2 membranes from a SiOx substrate using a mechanical blister test and found a value of 220 +/- 35 mJ/m(2). Our measurements were also used to determine the 2D Young's modulus (E-2D) of a single MoS2 layer to be 160 +/- 40 N/m. We then studied the delamination mechanics of pressurized MoS2 bubbles, demonstrating both stable and unstable transitions between the bubbles' laminated and delaminated states as the bubbles were inflated. When they were deflated, we observed edge pinning and a snap -in transition that are not accounted for by the previously reported, models. We attribute this result to adhesion, hysteresis and use our results to estimate the work of adhesion -of our membranes to be 42 + 20 mJ/m(2).
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