Preparation and identification of functional organic monolayers on Si wafer surfaces

Monolayers of organic adsorbates formed on Si wafers are prospective materials for nanometer-scale fabrication, chemical functionalization and biochemical analysis. We have been studying the methods of preparing organic monolayers by activating hydrogen-terminated H:Si(1 1 1). In this report, the method of photo-assisted adsorption of allylamine (CH2CH–CH2–NH2) and 1-butene (CH2CH–CH2–CH3) onto H:Si(1 1 1) is described. The adsorbates were identified by high-resolution electron energy loss spectroscopy and Auger electron spectroscopy. The functional group, NH2 in allylamine, was observed reserved in the adlayer. Mixed adlayers of allylamine and 1-butene, which is practically favorable, were also prepared.