AVS 64th International Symposium & Exhibition, Paper SS+HC-FrM9

AVS 64th International Symposium & Exhibition
Surface Science Division	Friday Sessions
Session SS+HC-FrM

Paper SS+HC-FrM9
Ambient STM Study of Sequentially Adsorbed Octanethiol and Biphenylthiol Monolayers on Au(111)

Session:	Recent Advances in the Chemistry and Physics of Interfaces
Presenter:	Gaby Avila-Bront, College of the Holy Cross
Correspondent:	Click to Email

The mixed monolayers of biphenyl-4-thiol (BPT) and octanethiol (OT) are studied at the molecular level using

scanning tunneling microscopy (STM) in ambient conditions and X-ray photoelectron spectroscopy (XPS) on

Au(111). The effect of both the sequence of deposition, and the concentration of the BPT solution used is

investigated. We observe signs of coexisting domains in the form of disordered patches surrounding flat patches

when a 100 μM solution of BPT is used. This observation holds for both OT being deposited first, and BPT being

deposited first. The most clear formation of coexisting domains occurs when an OT monolayer is immersed in a

100 μM solution of BPT. The XP spectra reveal a shift in the C 1s signal of the monolayers that is unique to what

films are deposited on the surface. These data demonstrate the importance characterizing mixed self-assembled

monolayers that form final monolayer structures unique to each mixture.