Atmospheric pressure mass spectrometry of single viruses and nanoparticles by nanoelectromechanical systems

Erdogan, R. Tufan and Alkhaled, Mohammed and Kaynak, Batuhan E. and Alhmoud, Hashim and Pisheh, Hadi Sedaghat and Kelleci, Mehmet and Karakurt, Ilbey and Yanık, Cenk and Şen, Zehra Betül and Sarı, Burak and Yagci, Ahmet M. and Özkul, Aykut and Hanay, M. Selim (2022) Atmospheric pressure mass spectrometry of single viruses and nanoparticles by nanoelectromechanical systems. ACS Nano, 16 (3). pp. 3821-3833. ISSN 1936-0851 (Print) 1936-086X (Online)

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Mass spectrometry of intact nanoparticles and viruses can serve as a potent characterization tool for material science and biophysics. Inaccessible by widespread commercial techniques, the mass of single nanoparticles and viruses (>10MDa) can be readily measured by nanoelectromechanical systems (NEMS)-based mass spectrometry, where charged and isolated analyte particles are generated by electrospray ionization (ESI) in air and transported onto the NEMS resonator for capture and detection. However, the applicability of NEMS as a practical solution is hindered by their miniscule surface area, which results in poor limit-of-detection and low capture efficiency values. Another hindrance is the necessity to house the NEMS inside complex vacuum systems, which is required in part to focus analytes toward the miniscule detection surface of the NEMS. Here, we overcome both limitations by integrating an ion lens onto the NEMS chip. The ion lens is composed of a polymer layer, which charges up by receiving part of the ions incoming from the ESI tip and consequently starts to focus the analytes toward an open window aligned with the active area of the NEMS electrostatically. With this integrated system, we have detected the mass of gold and polystyrene nanoparticles under ambient conditions and with two orders-of-magnitude improvement in capture efficiency compared to the state-of-the-art. We then applied this technology to obtain the mass spectrum of SARS-CoV-2 and BoHV-1 virions. With the increase in analytical throughput, the simplicity of the overall setup, and the operation capability under ambient conditions, the technique demonstrates that NEMS mass spectrometry can be deployed for mass detection of engineered nanoparticles and biological samples efficiently.
Item Type: Article
Uncontrolled Keywords: atmospheric pressure mass spectrometry; label-free virus detection; nanoelectromechanical systems; nanoparticle mass measurement; NEMS mass spectrometry; self-focusing NEMS; vacuum-free mass spectrometry
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Cenk Yanık
Date Deposited: 26 Aug 2022 09:30
Last Modified: 26 Aug 2022 09:30

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