Mass sensing for the advanced fabrication of nanomechanical resonators

TL;DR

This paper introduces a real-time mass sensing technique using nanomechanical resonators combined with electron beam deposition, enabling precise monitoring of nanostructure growth and facilitating advanced fabrication and study of nanomaterials.

Contribution

The study presents a novel, easily implementable method for real-time mass monitoring during nanostructure growth using existing FEBID systems, enhancing nanomechanical engineering capabilities.

Findings

Achieved zeptogram-level mass resolution in real-time

Demonstrated selective growth and monitoring of platinum particles

Enabled new insights into nanostructure growth dynamics

Abstract

We report on a nanomechanical engineering method to monitor matter growth in real time via e-beam electromechanical coupling. This method relies on the exceptional mass sensing capabilities of nanomechanical resonators. Focused electron beam induced deposition (FEBID) is employed to selectively grow platinum particles at the free end of singly clamped nanotube cantilevers. The electron beam has two functions: it allows both to grow material on the nanotube and to track in real time the deposited mass by probing the noise-driven mechanical resonance of the nanotube. On the one hand, this detection method is highly effective as it can resolve mass deposition with a resolution in the zeptogram range; on the other hand, this method is simple to use and readily available to a wide range of potential users, since it can be operated in existing commercial FEBID systems without making any modification. The presented method allows to engineer hybrid nanomechanical resonators with precisely tailored functionality. It also appears as a new tool for studying growth dynamics of ultra-thin nanostructures, opening new opportunities for investigating so far out-of-reach physics of FEBID and related methods.