Unique domain structure of pi-conjugated tolanethioacetate self-assembled monolayers on Au(111)

Youngdo Jeong; Seungwook Kwon; Yongku Kang; Changjin Lee; Eisuke Ito; Masahiko Hara; Jaegeun Noh

doi:10.1016/j.ultramic.2007.02.038

Unique domain structure of pi-conjugated tolanethioacetate self-assembled monolayers on Au(111)

Ultramicroscopy. 2007 Oct;107(10-11):1000-3. doi: 10.1016/j.ultramic.2007.02.038. Epub 2007 May 1.

Authors

Youngdo Jeong¹, Seungwook Kwon, Yongku Kang, Changjin Lee, Eisuke Ito, Masahiko Hara, Jaegeun Noh

Affiliation

¹ Advanced Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea.

PMID: 17570593
DOI: 10.1016/j.ultramic.2007.02.038

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.