Sensitivity in Nanomechanical Pedestal MEMS Cantilever

TL;DR

This paper investigates the sensitivity and mechanical behavior of nanomechanical MEMS cantilevers, focusing on surface stress effects, coating-related issues, and factors influencing sensing performance in nanowire-like structures.

Contribution

It provides new insights into the effects of surface stress, coating materials, and tip sharpness on the sensitivity and reliability of nanomechanical MEMS cantilevers.

Findings

Surface stress significantly affects nanowire resonator behavior.

Bioceramic and nanocomposite coatings influence fracture and sensitivity.

Tip sharpness impacts tip-sample conduction mechanisms.

Abstract

Nanomechanical resonator-based sensing devices are used in medical diagnostics based on their high-frequency dynamic behavior. Cantilevers fall into the category of Nanomechanical resonators. It also resembles a resonator whose shape is like that of a nanowire clamped at one end. As the surface-to-volume ratio of a nanowire resonator increases due to scaling down, surface stress plays a crucial role in the mechanical behavior of a resonator. Piezoresistive MEMS cantilevers are used for vapor phase analysis of volatile compounds and gas. Studies were done to address the mass sensitivity issues and fractures associated with bioceramic and nanocomposite coatings-based cantilever resonators. The studies show how the sensing performance can be determined or tuned. Nanomechanical studies of thin films of SiCN on silicon were performed. The sharpness of the tip was found to have an influence on the tip-sample conduction mechanism useful for MEMS applications