Abstract
Self-assembled monolayers of 1-octanethiol (OT-SAMs) on Au(111) substrates prepared using ethanol, N,N′-dimethylformamide (DMF), toluene, or hexane were examined using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) to investigate the effects of the solvent on the molecular packing at high solution temperatures (90 °C) and high pressures (21 psi) in a closed vessel. STM imaging revealed the formation of ordered OT-SAMs with a (3 × √7)R11° overlayer structure on Au(111) surfaces in ethanol, whereas OT-SAMs prepared in DMF revealed large ordered domains with a (√3 × √3)R30° phase and a c(4 × 2) superstructure. OT-SAMs prepared in toluene produced a mixture of ordered and striped phases, while no clear ordered structures were observed for OT-SAMs prepared in hexane. The disposition of OT bound to the Au(111) surfaces depended on the solvent, which also affected whether the OT-SAMs formed ordered or disordered phases. The intensities of XPS peaks at 161 and 162.3 eV increased wi...
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