Nanomechanical Resonators and Their Applications in Biological/Chemical Detection: Nanomechanics Principles

TL;DR

This paper reviews the principles and recent advances in nanomechanical resonators for biological and chemical detection, emphasizing novel detection mechanisms beyond simple mass change and highlighting future research directions.

Contribution

It provides a comprehensive overview of physical models, experimental findings, and future prospects for nanoresonator-based sensing technologies.

Findings

Surface effects and nonlinear oscillations influence detection sensitivity.

Coupled resonance and stiffness effects offer new detection mechanisms.

Integration of experiments and simulations enhances understanding of nanoscale detection.

Abstract

Recent advances in nanotechnology have led to the development of nano-electro-mechanical systems (NEMS) such as nanomechanical resonators, which have recently received significant attention from the scientific community. This has not only been for their capability for the label-free detection of bio/chemical-molecules at single-molecule (or atomic) resolution for future applications such as the early diagnostics of diseases such as cancer, but also for their unprecedented ability to detect physical quantities such as molecular weight, elastic stiffness, surface stress, and surface elastic stiffness for adsorbed molecules on the surface. Most experimental works on resonator-based molecular detection have been based on the principle that molecular adsorption onto a resonator surface increases the effective mass, and consequently decreases the resonant frequencies of the nanomechanical resonator. However, this principle is insufficient to provide fundamental insights into resonator-based molecular detection at the nanoscale; this is due to recently proposed novel nanoscale detection principles including various effects such as surface effects, nonlinear oscillations, coupled resonance, and stiffness effects. Therefore, our objective in this review is to overview the current attempts to understand the underlying mechanisms in nanoresonator-based detection using physical models coupled to computational simulations and/or experiments. Specifically, we will focus on issues of special relevance to the dynamic behavior of nanoresonators and their applications in biological/chemical detection. We additionally provide extensive discussion regarding potentially fruitful future research directions coupling experiments and simulations in order to develop a fundamental understanding of the basic physical principles that govern NEMS and NEMS-based sensing applications.