Unique domain structure of pi-conjugated tolanethioacetate self-assembled monolayers on Au(111).
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.
Jeong
Youngdo
Y
Advanced Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea.
Kwon
Seungwook
S
Kang
Yongku
Y
Lee
Changjin
C
Ito
Eisuke
E
Hara
Masahiko
M
Noh
Jaegeun
J