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Su, Pei; Hu, Hang; Warneke, Jonas; Belov, Mikhail E; Anderson, Gordon A; Laskin, Julia
Analytical chemistry (Washington), 05/2019, Letnik: 91, Številka: 9Journal Article
A new apparatus for ion soft landing research was developed and is reported in this contribution. The instrument includes a dual polarity high-flux electrospray ionization (ESI) interface, a tandem electrodynamic ion funnel system, a collisional flatapole, a quadrupole mass filter, and a focusing lens. The instrument enables production of ionic layers by soft landing of mass-selected ions onto surfaces with balanced or imbalanced charge conditions using either layer-by-layer (LBL) or fast polarity switching modes. We present the first evidence of using weakly coordinating stable anions to protect the ionizing protons of soft-landed cations on the surface. The observed proton retention is particularly efficient when fast polarity switching of anions and cations is employed to deposit small quantities of ions in short deposition segments. Furthermore, we observe more efficient charge retention and better ionic complexation in a charge-balanced layer prepared by fast polarity switching deposition. These findings open up new opportunities for the fabrication of novel ionic assemblies using well-defined gaseous ions as building blocks.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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