An Alkyl Spacer Effect on the Structure of 4-Fluorobenzenethiol and 4-Fluorobenzenemethanethiol Self-Assembled Monolayers on Au(111)
- Title
- An Alkyl Spacer Effect on the Structure of 4-Fluorobenzenethiol and 4-Fluorobenzenemethanethiol Self-Assembled Monolayers on Au(111)
- Author
- 노재근
- Keywords
- Self-Assembled Monolayers; 4-Fluorobenzenethiol; 4-Fluorobenzenemethanethiol; Alkyl Spacer Effect; Scanning Tunneling Microscopy
- Issue Date
- 2012-05
- Publisher
- American Scientific Publishers
- Citation
- Journal of Nanoscience and Nanotechnology, 2012, 12(5), P.4274~4282
- Abstract
- Self-assembled monolayers (SAMs) formed by the adsorption of 4-fluorobenzenethiol (4-FBT) and 4-fluorobenzenemethanethiol (4-FBMT) on Au(111) were examined by scanning tunneling microscopy (STM) to understand the effect of a flexible methylene spacer between the sulfur headgroup and phenyl group and the effect of solution temperature on the formation and structure of the SAMs. Although the adsorption of 4-FBT on Au(111) at room temperature for 24 h generated only disordered phase SAMs containing gold adatom islands, 4-FBT at 75 °C for 2 h formed mixed SAMs: disordered phases and ordered (2 × 12√2)R10° superlattice with a rectangular unit cell containing six adsorbed molecules. On the other hand, SAMs formed from 4-FBMT, with a methylene spacer, at room temperature for 24 h on Au(111) had irregularly ordered phases containing uniformly distributed VIs with lateral dimensions of 2.5 nm; SAMs formed from 4-FBMT at 75 °C for 2 h were composed of slightly improved ordered phases and larger VIs with lateral dimensions of 5–12 nm as a result of Ostwald ripening. From this study, we found that the methylene spacer plays an important role in controlling the structure of SAMs formed from p-substituted fluorinated aromatic thiols.
- URI
- http://www.ingentaconnect.com/content/asp/jnn/2012/00000012/00000005/art00093?crawler=true&mimetype=application/pdfhttps://repository.hanyang.ac.kr/handle/20.500.11754/70120
- ISSN
- 1533-4880
- DOI
- 10.1166/jnn.2012.5943
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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