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- W2155232419 abstract "Secondary ion mass spectrometry (SIMS) run in the event-by-event bombardment/detection mode provides a unique ability to obtain molecular information from single nano-objects, since assays are based on secondary ion coemission from single impacts. The characterization of individual nano-objects is demonstrated with negatively charged polymer spheres that are attracted to and retained by nanoalumina whiskers. The whiskers, 2 nm in diameter and ∼250 nm in length, are grafted to a microglass fiber with an average diameter of ∼0.6 μm and several millimeters long. The spheres are monodisperse polystyrene nanoparticles (30 nm diameter). Massive Au projectiles, specifically 136 keV Au4004+, were utilized to bombard analyte surfaces due to its high efficiency for producing multi-ion emission identified by time-of-flight mass spectrometry. Our results show that this mode of mass spectrometry can provide information on the nature, size, relative location, and abundance of nano-objects in the field of view. The key to characterizing nanodomains is to monitor the coincidental secondary ion emission from the nanovolume perturbed by single projectile impacts." @default.
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- W2155232419 date "2009-08-05" @default.
- W2155232419 modified "2023-09-28" @default.
- W2155232419 title "Molecular Identification of Individual Nano-Objects" @default.
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- W2155232419 doi "https://doi.org/10.1021/ac9014337" @default.
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