Abstract
The ionic charge state of monodisperse multiply charged cationic gold clusters on surfaces may be controlled by selecting the coverage of mass-selected ions soft landed onto a substrate. Polydisperse diphosphine-capped gold clusters were synthesized in solution and introduced into the gas phase by electrospray ionization. Mass selection was employed to isolate a multiply charged cationic cluster species (Au11L53+, m/z = 1409, L = 1,3-bis(diphenylphosphino)propane) which was delivered to the surfaces of four different self-assembled monolayers on gold (SAMs) at controlled coverages of 1011 and 1012 clusters. Employing the spatial profiling capabilities of in situ time-of-flight secondary ion mass spectrometry (TOF-SIMS), it is shown that, in addition to the chemical functionality of the monolayer (as demonstrated previously: ACS Nano 2012, 6, 573), the coverage of cationic gold clusters on the surface may be used to control the relative abundance of different charge states of the soft landed multiply charg...
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