Thiol Terminated 1,4-Benzenedimethanethiol Self-Assembled Monolayers on Au(111) and InP(110) from Vapor Phase

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• 作者：Leonardo Salazar Alarcn ; Lin Chen ; Vladimir A. Esaulov ; Julio E. Gayone ; Esteban A. Snchez ; Oscar Grizzi
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 2, 2010
• 年：2010
• 卷：114
• 期：47
• 页码：19993-19999
• 全文大小：430K
• 年卷期：v.114,no.47(December 2, 2010)
• ISSN：1932-7455

文摘

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 370 K, above this temperature a reordering of the layer takes place where S atoms are no longer available at the vacuum interface. Final desorption occurs around 450 K for Au and around 500K for InP.