Sm. Driver et Dp. Woodruff, Adsorption structures of 1-octanethiol on Cu(111) studied by scanning tunneling microscopy, LANGMUIR, 16(16), 2000, pp. 6693-6700
The interaction of 1-octanethiol with Cu(111) at room temperature in ultrah
igh vacuum has been studied using scanning tunneling microscopy (STM). Two
structural phases are observed, a "honeycomb" phase and a pseudo-(100) reco
nstructed surface phase, which are essentially equivalent to methanethiolat
e structures observed on Cu(111) in a recent study using STM. The pseudo-(1
00) structure can also be reconciled with the results of a prior study of t
his phase using normal-incidence X-ray standing wavefield absorption, which
indicated the presence of adsorbate-induced reconstruction but was unable
to establish further details of the local structure. We discuss the similar
ity of the behavior of octanethiol and methanethiol on Cu(111), contrast th
is with alkanethiol behavior on Au(111), and discuss the role of S-substrat
e interactions in the structures of these self-organized monolayers.