COLL 352 |
| Frank Schreiber, Physical and Theoretical Chemistry Laboratory, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Rd, Oxford, OX1 3QZ, United Kingdom |
| We discuss the structures and phase transitions of thiol-based self-assembled monolayers (SAMs) as a function of temperature and coverage. Starting from the archetypal case of alkanethiols of various length on Au(111), which is used to describe the general scenario of phase transitions in SAMs (F. Schreiber, Prog. Surf. Sci. 65 (2000) 151), we discuss the effect of various changes of the molecular backbone and of the endgroup. The systems studied include biphenyls, dithiols, and endgroup-fluorinated alkanethiols. It is found that while the general scenario observed for alkanethiols can act as a guide, even small modifications of the molecules can lead to important changes in the phase diagram. Finally, we will discuss the effect of species adsorbed on SAMs as cap layers which can cause strong changes of the phase transitions and the thermal stability of multi-component systems, which is a technologically important issue. The results have been obtained in Princeton, Stuttgart, and Brookhaven and are a collaborative effort. The contributions of all collaborators involved are gratefully acknowledged. |
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Adamson Award Symposium Honoring Dave Allara and Ralph Nuzzo
Division of Colloid and Surface Chemistry |