A new multifunctional platform based on high aspect ratio interdigitated NEMS structures

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Development of mass-producible nanomechanical systems (NEMS) is crucial for advanced sensing.
• Polymer-based NEMS offer potential for low-cost fabrication and integration.
• Surface relief gratings provide a platform for high-density nanostructure fabrication.

Purpose of the Study:

• To develop and fabricate a multifunctional NEMS platform using polymer materials.
• To demonstrate the platform's application as a high-sensitivity mass sensor in ambient air.
• To showcase the device's capability as a varactor for electronic circuits.

Main Methods:

• Fabrication of a surface relief grating with high aspect ratio nanometer-sized walls using nanoimprint lithography.
• Characterization of the NEMS platform's resonant frequency response at approximately 200 MHz.
• Demonstration of selective adsorption of airborne molecules (thiols) and measurement of tunable capacitive range.

Main Results:

• Achieved mass responsivity of 0.1 Hz/zg per wall at room temperature and in ambient air.
• Successfully demonstrated selective adsorption of airborne target molecules.
• Confirmed the device's functionality as a varactor with a large tunable capacitive range.

Conclusions:

• The developed polymer-based NEMS platform is a versatile and mass-producible technology.
• The platform exhibits high sensitivity for mass sensing applications in air.
• The dual functionality as a mass sensor and varactor highlights its broad applicability in NEMS.