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Atomic layer MoS2-graphene van der Waals heterostructure nanomechanical resonators
Fan Ye1, Jaesung Lee, Philip X-L Feng
1Department of Electrical Engineering & Computer Science, Case School of Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA. philip.feng@case.edu.
Nanoscale
|November 22, 2017
Summary
Researchers created freestanding van der Waals heterostructures using molybdenum disulfide (MoS2) and graphene. These novel atomic layer structures demonstrate robust nanomechanical resonances, paving the way for new device applications.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Heterostructures are crucial for semiconductor devices, with current technology focusing on crystalline epi-layers.
- The ultimate limit for heterostructures involves atomic layer structures, offering unique properties.
Purpose of the Study:
- To experimentally demonstrate freestanding van der Waals heterostructures.
- To investigate the nanomechanical properties of MoS2-graphene heterostructures.
Main Methods:
- Stacking single-layer molybdenum disulfide (MoS2) onto suspended graphene sheets of varying thicknesses (1 to 4 layers).
- Fabricating and characterizing MoS2-graphene heterostructures as nanomechanical devices.
- Measuring nanomechanical resonances in the very high frequency (VHF) band.
Main Results:
- Successful creation of freestanding MoS2-graphene van der Waals heterostructures.
- Observed robust nanomechanical resonances up to approximately 100 MHz.
- Resonance frequencies of heterostructures lie between those of pure graphene and MoS2.
- Quality factors of heterostructures are lower than graphene but similar to MoS2, indicating interface damping.
Conclusions:
- Suspended atomic layer heterostructures serve as an effective platform for novel devices.
- Interlayer interactions and mechanical coupling effects in van der Waals heterostructures can be exploited for device applications.
