Dynamic Analysis of a Novel Mass Nanosensor Made From Piezo-Electro-Magnetic Sandwich Nanoplate

Abstract

In this study, a novel nano-electromechanical system (NEMS) mass nanosensor made from a functionally graded porous (FGP) core bonded with piezo-electro-magnetic (PEM) layers is proposed to reveal the combined effect of FGP and PEM on the sensitivity performance of mass nanosensors. First, a theoretical model for this mass nanosensor attached with single/multiple nanoparticles is established via nonlocal strain gradient plate theory. Herein, the FGP core obeying the power-law and sigmoid-law gradient patterns is taken into account, and the inside porosity is considered as even and uneven distributions. Subsequently, the natural frequency shift (NFS) behavior of this mass nanosensor with different attached nanoparticles is investigated via Galerkin method. Finally, a comprehensive parametric analysis is performed to reveal the influence of inhomogeneity index, porosity distributed pattern and porosity volume fraction of core material, size-dependent parameters, as well as the external electric voltage and magnetic potential on the NFS performance of the NEMS mass nanosensor. The obtained results have illustrated that combining PEM surface and FGP core can present significant improvement on the sensitivity of the NEMS mass nanosensor for detecting nanoparticles. The sandwich design strategy for the mass nanosensor proposed in this work would be highly valuable for designing high-performance mass nanosensor in biomedical and industrial applications.