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Formation and Thermal Stability of Ordered Self-Assembled Monolayers by the Adsorption of Amide-Containing Alkanethiols on Au(111).
| Content Provider | Europe PMC |
|---|---|
| Author | Son, Young Ji Han, Jin Wook Kang, Hungu Seong, Sicheon Han, Seulki Maeda, Shoichi Chikami, Shunta Hayashi, Tomohiro Hara, Masahiko Noh, Jaegeun |
| Editor | Ihee, Hyotcherl Kim, Tae Kyu Kim, Hyungjun Rhee, Young Min |
| Copyright Year | 2023 |
| Abstract | We examined the surface structure, binding conditions, electrochemical behavior, and thermal stability of self-assembled monolayers (SAMs) on Au(111) formed by N-(2-mercaptoethyl)heptanamide (MEHA) containing an amide group in an inner alkyl chain using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) to understand the effects of an internal amide group as a function of deposition time. The STM study clearly showed that the structural transitions of MEHA SAMs on Au(111) occurred from the liquid phase to the formation of a closely packed and well-ordered β-phase via a loosely packed α-phase as an intermediate phase, depending on the deposition time. XPS measurements showed that the relative peak intensities of chemisorbed sulfur against Au 4f for MEHA SAMs formed after deposition for 1 min, 10 min, and 1 h were calculated to be 0.0022, 0.0068, and 0.0070, respectively. Based on the STM and XPS results, it is expected that the formation of a well-ordered β-phase is due to an increased adsorption of chemisorbed sulfur and the structural rearrangement of molecular backbones to maximize lateral interactions resulting from a longer deposition period of 1 h. CV measurements showed a significant difference in the electrochemical behavior of MEHA and decanethiol (DT) SAMs as a result of the presence of an internal amide group in the MEHA SAMs. Herein, we report the first high-resolution STM image of well-ordered MEHA SAMs on Au(111) with a (3 × 2√3) superlattice (β-phase). We also found that amide-containing MEHA SAMs were thermally much more stable than DT SAMs due to the formation of internal hydrogen networks in MEHA SAMs. Our molecular-scale STM results provide new insight into the growth process, surface structure, and thermal stability of amide-containing alkanethiols on Au(111). |
| Journal | International Journal of Molecular Sciences [Int J Mol Sci] |
| Volume Number | 24 |
| DOI | 10.3390/ijms24043241 |
| PubMed Central reference number | PMC9967528 |
| Issue Number | 4 |
| PubMed reference number | 36834654 |
| e-ISSN | 14220067 |
| Language | English |
| Publisher | Molecular Diversity Preservation International (MDPI) |
| Publisher Date | 2023-02-07 |
| Access Restriction | Open |
| Subject Keyword | self-assembled monolayers N-(2-mercaptoethyl)heptanamide decanethiol adsorption structure thermal stability amide group hydrogen bonding scanning tunneling microscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physical and Theoretical Chemistry Molecular Biology Spectroscopy Catalysis Computer Science Applications Medicine Inorganic Chemistry Organic Chemistry |
