Formation and superlattice of long-range and highly ordered alicyclic selenolate monolayers on Au(111) studied by scanning tunneling microscopy
- Authors
- Kang, Hungu; Jeong, Hyerim; Seong, Sicheon; Han, Seulki; Son, Young Ji; Tahara, Hiroyuki; Hayashi, Tomohiro; Yoon, Hyo Jae; Noh, Jaegeun
- Issue Date
- 15-1월-2022
- Publisher
- ELSEVIER
- Keywords
- Self-assembled monolayers; Cyclohexanethiolate; Cyclohexaneselenolate; Surface structure; Domain formation; Scanning tunneling microscopy
- Citation
- APPLIED SURFACE SCIENCE, v.572
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 572
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135268
- DOI
- 10.1016/j.apsusc.2021.151454
- ISSN
- 0169-4332
- Abstract
- The formation and surface structures of cyclohexanethiolate (CYH-S) and cyclohexaneselenolate (CYH-Se) self assembled monolayers (SAMs) on Au(1 1 1) were probed to understand headgroup effects on the formation of SAMs with an alicyclic backbone using scanning tunneling microscopy (STM). CYH-S SAMs on Au(1 1 1) formed via solution deposition at room temperature (RT) were composed of small ordered domains with sizes ranging from 10 to 30 nm, whereas CYH-Se SAMs on Au(1 1 1) usually had a disordered phase. The molecular arrangements of CYH-S SAMs on Au(1 1 1) could be described as a (5 x 2 root 3)R30 degrees structure. CYH-Se SAMs formed via vapor deposition at RT had a long-range ordered phase (greater than 100 nm) including missing rows and molecular defects. A highly ordered crystalline phase of CYH-Se SAMs on Au(1 1 1) with fewer structural defects was formed at 323 K for 12 h that was assigned to a (root 3.5 x 2 root 10)R27 degrees structure. STM observations revealed that the domain formation and surface structures of CYH-Se SAMs on Au(1 1 1) were completely different from those of CYH-S SAMs. Furthermore, we found that CYH-S and CYH-Se SAM can be utilized for bonding-induced work function modification of Au substrate through Kelvin probe force microscopy measurement.
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