This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1021/la052791u in citations.
Please use the identifier: http://hdl.handle.net/2128/1026 in citations.
STM study of mixed alkanethiol/biphenylthiol self-assembled monolayers on Au(111)
STM study of mixed alkanethiol/biphenylthiol self-assembled monolayers on Au(111)
A method is presented for depositing mixed self-assembled monolayers (SAMs) of dodecanethiol (C12) and 4'-methyl-1,1'-biphenyl-4-butane (H3C-C6H4-C6H4-(CH2)4-SH, BP4) by insertion of BP4 into a closely packed SAM of dodecanethiol on Au(111). Insertion takes place at defect sites such as do...
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Personal Name(s): | Lüssem, B. |
---|---|
Müller-Meskamp, B. / Karthäuser, S. / Waser, R. / Homberger, M. / Simon, U. | |
Contributing Institute: |
Elektronische Materialien; IFF-IEM JARA-FIT; JARA-FIT |
Published in: | Langmuir, 22 (2006) 7, S. 3021 - 3027 |
Imprint: |
Washington, DC
ACS Publ.
2006
|
Physical Description: |
3021 - 3027 |
PubMed ID: |
16548552 |
DOI: |
10.1021/la052791u |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Langmuir
22 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/1026 in citations.
A method is presented for depositing mixed self-assembled monolayers (SAMs) of dodecanethiol (C12) and 4'-methyl-1,1'-biphenyl-4-butane (H3C-C6H4-C6H4-(CH2)4-SH, BP4) by insertion of BP4 into a closely packed SAM of dodecanethiol on Au(111). Insertion takes place at defect sites such as domain boundaries or etch pits in the gold surface that are characteristic of C12 monolayers on gold. With a lower probability, insertion also occurs beside defect sites inside dodecanethiol domains. Insertion at defect sites results in domains of BP4, whereas insertion into C12 domains leads to isolated BP4 molecules. The isolated BP4 molecules are shown not to move at room temperature. By comparing the apparent height of the isolated BP4 molecules and BP4 domains, it is proposed that the isolated molecules have the same conformation as in the full-coverage phase. A simple two-layer model is proposed to characterize the current transport through BP4. The decay constant beta for the phenylene groups is deduced from the apparent STM heights of the inserted BP4 islands compared to the STM heights of the C12 closely packed monolayers. |