✦ LIBER ✦

Laser Desorption/Vacuum Ultraviolet Photoionization of Alkanethiolate Self-assembled Monolayers

✍ Scribed by Jennifer L. Trevor; Luke Hanley; Keith R. Lykke

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 65 KB
Volume: 11
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(199704)11:6<587::aid-rcm877>3.0.co;2-j

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✦ Synopsis

Self

-assembled monolayers of straight-chain alkanethiolates (RS) on gold were studied by nitrogen laser desorption followed by vacuum ultraviolet (118 nm) photoionization of secondary neutrals in a time-of-flight mass spectrometer. The dominant feature of all photoionization mass spectra were the dimers (RSSR + ) for all thiolates studied. No monomer ions (RS + ) were observed, in contrast with previous results from time-of-flight secondary ion and direct laser desorption mass spectrometry. Results are presented from experiments on the tetradecyl (C 14 ) and hexadecyl (C 16 ) mercaptan monolayers. Mixed C 14 /C 16 monolayers generated both pure and mixed dimers, indicating a facile association between different monomer chain lengths.

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