Dynamic Behavior of Mass Sensor Based on Switchable Dual-Mode Composite Strips.

Area of Science:

• Mechanical Engineering
• Materials Science
• Nanotechnology

Background:

• Micro- and nanoscale mass sensing is vital for molecular detection and wearable devices.
• Observing mass changes in flexible composites needs theoretical analysis.

Purpose of the Study:

• Develop a dual-mode vibration-based mass-sensing model for film-substrate composites.
• Analyze mass perturbation effects in flexible structures switching between 2D and 3D configurations.

Main Methods:

• Formulated displacement fields and kinematic relations for flat (Mode 1) and buckled (Mode 2) configurations using Euler-Bernoulli beam theory.
• Employed an energy-based approach and Hamiltonian function to derive governing equations of motion.
• Incorporated an added-mass block into kinetic energy for mass perturbation analysis.

Main Results:

• Investigated the influence of added mass on displacement signatures in both configurations.
• Compared the mode-dependent observability of mass perturbations in flat versus buckled states.
• Demonstrated distinct dynamic responses based on the composite strip's configuration.

Conclusions:

• The developed model provides an analytical framework for evaluating vibration-based mass sensors.
• Understanding mode-dependent responses is crucial for designing sensitive and reliable flexible mass sensors.
• The reversible switching mechanism offers a novel approach for tunable mass sensing applications.