Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 47, Pages 19993-19999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1044157
Keywords
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Funding
- ECOS Sud MINCyT program [A07E01]
- MINCyT [PICT 06-715]
- Argentine Nanoscience Network PAE [22708, 22711]
- CONICET [PIP 112-200801-00958]
- UNC [06/C323, 06/C317]
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We present results of a clean vacuum evaporative adsorption method of assembly of the conjugated dithiol molecule 1,4-benzenedimethanethiol on the surfaces of gold and indium phosphide. Measurements of direct recoil spectroscopy with time-of-flight analysis show in both cases formation of a self-assembled monolayer (SAM) with S atoms available at the SAM-vacuum interface. Investigation of the adsorption kinetics shows that a lying-down phase is formed at low exposures, which precedes the standing up SAM phase. The standing up SAM formation requires exposures of the order of a mega Langmuir. A study of the SAM stability with temperature shows that the S terminated layer survives up to similar to 370 K, above this temperature a reordering of the layer takes piece where S atoms are no longer available at the vacuum interface. Final desorption occurs around 450 K for Au and around 500K for InP.
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