title: Preparation and characterization of an ordered 1-dodecanethiol monolayer on bare Si(111) surface.
abstract: We have grown 1-dodecandthiol (DDT) monolayer on a bare Si(111) surface through ultraviolet-assisted photochemical reaction. The resulting monolayer was investigated by means of water contact angle measurement, synchrotron radiation-based high-resolution X-ray photoelectron spectroscopy, and polarization-dependent near-edge X-ray absorption fine structure spectroscopy. These combined probes for characterization reveal a hydrophobic ambient surface; the DDT was directly attached to Si through a Si-S bond, and the molecules formed an ordered monolayer with an average tilt angle of 57° of the alkyl chains relative to the substrate surface.
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
authors.forename: Jie Ling
authors.initials: JL
authors.lastname: Lou
authors.forename: Hung Wei
authors.initials: HW
authors.lastname: Shiu
authors.forename: Lo Yueh
authors.initials: LY
authors.lastname: Chang
authors.forename: Chia Ping
authors.initials: CP
authors.lastname: Wu
authors.forename: Yun-Liang
authors.initials: YL
authors.lastname: Soo
authors.forename: Chia-Hao
authors.initials: CH
authors.lastname: Chen