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  • Title: Unique domain structure of pi-conjugated tolanethioacetate self-assembled monolayers on Au(111).
    Author: Jeong Y, Kwon S, Kang Y, Lee C, Ito E, Hara M, Noh J.
    Journal: Ultramicroscopy; 2007 Oct; 107(10-11):1000-3. PubMed ID: 17570593.
    Abstract:
    Surface structures of tolanethioacetate (TTA) self-assembled monolayers (SAMs) on Au(111), formed in a 0.5mM N,N'-dimethylformamide (DMF) solution, were investigated as a function of solution temperature by scanning tunneling microscopy (STM). The STM study revealed that thioacetyl-terminated TTA molecules on Au(111) did not form ordered SAMs at room temperature and 80 degrees C, whereas the adsorption of TTA molecules on Au(111) at a solution temperature of 50 degrees C led to the formation of two mixed phases: a disordered phase and a unique ordered phase, consisting rod-like domains, which can be described as a ( radical6x radical13)15 degrees superstructure. From this study, it was demonstrated that solution temperature is a key factor controlling the two-dimensional SAM structure of TTA molecules.
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