The striped phases of ethylthiolate monolayers on the Au(111) surface: A scanning tunneling microscopy study

Striped phases of ethylthiolate monolayers, corresponding to surface coverage in between 0.2 ML and 0.27 ML, were studied using high-resolution scanning tunneling microscopy. Striped phases consist of rows of Au-adatom-diethythiolate (AAD) aligned along the [11 (2) over bar] direction. In the perpendicular [1 (1) over bar0] direction, the AAD rows adjust their spacing according to the surface coverage. A (5 root 3 x root 3)-R30 degrees striped phase with 0.27 ML thiolate and a (6 root 3 x root 3)-R30 degrees striped phase with 0.23 ML thiolate, both with long-range order, are found. A localized (5 x root 3)-rect. phase is also found as a minority phase embedded in the 5 root 3 x root 3)-R30 degrees phase. This (5 x v 3)-rect. phase can be constructed using di-Au-adatom-tri-thiolate species. (