Open AccessLaser desorption ion trap mass spectrometry of self-assembled monolayers
Author(s) -
John A. Burroughs,
Luke Hanley
Publication year - 1993
Publication title -
journal of the american society for mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.961
H-Index - 127
eISSN - 1879-1123
pISSN - 1044-0305
DOI - 10.1016/1044-0305(93)80024-s
Subject(s) - chemistry , monolayer , mass spectrometry , analytical chemistry (journal) , fragmentation (computing) , ion , desorption , mass spectrum , adsorption , ion trap , sulfonate , static secondary ion mass spectrometry , secondary ion mass spectrometry , chromatography , organic chemistry , biochemistry , operating system , sodium , computer science
It is demonstrated that laser desorption ion trap mass spectrometry (LD-ITMS) can be successfully applied to the chemical analysis of a monolayer of adsorbates on a solid surface. Negative ion spectra obtained from LD-ITMS of self-assembled monolayers adsorbed from solutions of alkanethiols (CH3(CH2)nSH with n=5, 9, and 15) onto polycrystalline gold surfaces displayed clear ion peaks corresponding to the sulfonate adsorbate species. Sulfonate ions with the general formula CH3(CH2)n SO3 were detected at m/z 165, 221, and 305, respectively, and were derived from the partial oxidation of the corresponding alkanethiol self-assembled monolayers. Little fragmentation and no clustering was observed in these mass spectra. These results indicate that the sensitivity of LD-ITMS is sufficient to allow its application to a wide array of problems in surface science.