Journal
ACS NANO
Volume 10, Issue 7, Pages 6491-6500Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02402
Keywords
ab initio calculations; contact-resonance atomic force microscopy; elastic properties; surfaces and interfaces; 2D materials and heterostructures
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Funding
- Duke University's Energy Research Seed Fund
- NSF through the Research Triangle MRSEC [DMR-11-21107]
- DOE Office of Science User Facility [DE-AC02-06CH11357]
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Interfaces and subsurface layers are critical for the performance of devices made of 2D materials and heterostructures. Facile, nondestructive, and quantitative ways to characterize the structure of atomically thin, layered materials are thus essential to ensure control of the resultant properties. Here, we show that contact-resonance atomic force microscopy which is exquisitely sensitive to stiffness changes that arise from even a single atomic layer of a van der Waals-adhered material is a powerful experimental tool to address this challenge. A combined density functional theory and continuum modeling approach is introduced that yields sub-surface-sensitive, nanomechanical fingerprints associated with specific, well-defined structure models of individual surface domains. Where such models are known, this information can be correlated with experimentally obtained contact-resonance frequency maps to reveal the (sub)surface structure of different domains on the sample.
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