Compact and modular system architecture for a nano-resonator-mass spectrometer

Area of Science:

• Nanotechnology
• Analytical Chemistry
• Mass Spectrometry

Background:

• Characterizing ultra-high mass analytes (mega-to-giga-Dalton range) is crucial but challenging for conventional mass spectrometers.
• Nano-electro-mechanical system (NEMS) based mass spectrometry (MS) offers unique capabilities for such analyses.
• Existing NEMS-MS designs inherited limitations from conventional MS, including high vacuum needs and ion guides.

Purpose of the Study:

• To investigate the impact of pressure on NEMS sensor and aerodynamic lens performance.
• To develop a more compact and efficient NEMS-MS prototype.
• To enhance nanoparticle analysis through improved focusing and mass measurement.

Main Methods:

• Investigated pressure effects on NEMS sensor and aerodynamic lens performance.
• Designed and constructed a new, more compact NEMS-MS prototype with improved aerodynamic lens alignment.
• Evaluated the prototype using nanoparticle deposition for aerodynamic focusing and mass measurements of gold nanoparticles.

Main Results:

• The NEMS spectrometer demonstrated robust performance at significantly higher pressures than anticipated.
• The new prototype exhibited superior particle focusing capabilities.
• Particle capture efficiency improved by nearly two orders of magnitude at two orders of magnitude higher operating pressure, without compromising mass resolution.

Conclusions:

• NEMS-MS can operate effectively at higher pressures, overcoming limitations of conventional MS.
• The developed compact NEMS-MS prototype offers enhanced performance for nanoparticle characterization.
• This advancement paves the way for more accessible and efficient ultra-high mass analysis.