Functional 2D MoS₂ NEMS resonator array with independent electronic tunability based on mass transfer printing

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Electrical Engineering

Background:

• Resonant nanoelectromechanical systems (NEMS) using 2D materials offer superior resonance properties for sensing and signal processing.
• Scalable fabrication of high-performance, electronically controlled 2D NEMS arrays remains a significant challenge.

Purpose of the Study:

• To develop a scalable fabrication method for large-scale, electronically independent 2D NEMS resonators.
• To demonstrate individual electronic control and potential applications of these NEMS arrays.

Main Methods:

• A novel mass transfer printing (MTP) technique was employed for fabricating molybdenum disulfide (MoS2) NEMS resonators.
• The MTP method involves precise tearing of MoS2 using surface tension and dry transfer to a patterned substrate with microtrenches and electrodes.
• This process avoids lithography-induced damage, preserving the integrity of suspended 2D materials.

Main Results:

• Fabrication of 84 monolayer MoS2 NEMS resonators with maintained material quality and structural integrity.
• Demonstrated highly tunable resonance frequencies in the very-high-frequency (VHF) band with consistent quality (Q) factor trends and significant signal-to-noise ratios (SNRs).
• Confirmed independent electronic control of adjacent resonators without crosstalk, enabling functional device demonstrations like a decimal-to-binary converter.

Conclusions:

• The MTP technique provides a scalable and straightforward pathway for fabricating large-scale, independently addressable 2D NEMS arrays.
• This advancement facilitates the integration of 2D NEMS devices for diverse applications in sensing, signal processing, and computing.
• The developed NEMS platform shows significant promise for future integrated nanoelectronic systems.