Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition
To probe the effects of deposition temperature on the formation and structural order of self-assembled monolayers (SAMs) on Au(111) prepared by vapor deposition of 2-(2-methoxyethoxy)ethanethiol (CH<sub>3</sub>O(CH<sub>2</sub>)<sub>2</sub>O(CH<sub>2</sub&...
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MDPI AG
2022-08-01
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| author | Young Ji Son Hungu Kang Sicheon Seong Seulki Han Nam-Suk Lee Jaegeun Noh |
| author_facet | Young Ji Son Hungu Kang Sicheon Seong Seulki Han Nam-Suk Lee Jaegeun Noh |
| author_sort | Young Ji Son |
| collection | DOAJ |
| description | To probe the effects of deposition temperature on the formation and structural order of self-assembled monolayers (SAMs) on Au(111) prepared by vapor deposition of 2-(2-methoxyethoxy)ethanethiol (CH<sub>3</sub>O(CH<sub>2</sub>)<sub>2</sub>O(CH<sub>2</sub>)<sub>2</sub>SH, EG2) for 24 h, we examined the surface structure and electrochemical behavior of the resulting EG2 SAMs using scanning tunneling microscopy (STM) and cyclic voltammetry (CV). STM observations clearly revealed that EG2 SAMs vapor-deposited on Au(111) at 298 K were composed of a disordered phase on the entire Au surface, whereas those formed at 323 K showed improved structural order, showing a mixed phase of ordered and disordered phases. Moreover, at 348 K, uniform and highly ordered EG2 SAMs on Au(111) were formed with a (2 × 3√3) packing structure. CV measurements showed sharp reductive desorption (RD) peaks at −0.818, −0.861, and −0.880 V for EG2 SAM-modified Au electrodes formed at 298, 323, and 348 K, respectively. More negative potential shifts of RD peaks with increasing deposition temperature are attributed to an increase in van der Waals interactions between EG2 molecular backbones resulting from the improved structural quality of EG2 SAMs. Our results obtained herein provide new insights into the formation and thermally driven structural order of oligo(ethylene glycol)-terminated SAMs vapor-deposited on Au(111). |
| first_indexed | 2024-03-10T01:32:01Z |
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| id | doaj.art-d330e26371714ea7aa94ce1f780359ec |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T01:32:01Z |
| publishDate | 2022-08-01 |
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| record_format | Article |
| series | Molecules |
| spelling | doaj.art-d330e26371714ea7aa94ce1f780359ec2023-11-23T13:40:56ZengMDPI AGMolecules1420-30492022-08-012717537710.3390/molecules27175377Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor DepositionYoung Ji Son0Hungu Kang1Sicheon Seong2Seulki Han3Nam-Suk Lee4Jaegeun Noh5Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaDepartment of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaDepartment of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaDepartment of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaNational Institute for Nanomaterials Technology, Pohang University of Science and Technology, Pohang 37673, KoreaDepartment of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaTo probe the effects of deposition temperature on the formation and structural order of self-assembled monolayers (SAMs) on Au(111) prepared by vapor deposition of 2-(2-methoxyethoxy)ethanethiol (CH<sub>3</sub>O(CH<sub>2</sub>)<sub>2</sub>O(CH<sub>2</sub>)<sub>2</sub>SH, EG2) for 24 h, we examined the surface structure and electrochemical behavior of the resulting EG2 SAMs using scanning tunneling microscopy (STM) and cyclic voltammetry (CV). STM observations clearly revealed that EG2 SAMs vapor-deposited on Au(111) at 298 K were composed of a disordered phase on the entire Au surface, whereas those formed at 323 K showed improved structural order, showing a mixed phase of ordered and disordered phases. Moreover, at 348 K, uniform and highly ordered EG2 SAMs on Au(111) were formed with a (2 × 3√3) packing structure. CV measurements showed sharp reductive desorption (RD) peaks at −0.818, −0.861, and −0.880 V for EG2 SAM-modified Au electrodes formed at 298, 323, and 348 K, respectively. More negative potential shifts of RD peaks with increasing deposition temperature are attributed to an increase in van der Waals interactions between EG2 molecular backbones resulting from the improved structural quality of EG2 SAMs. Our results obtained herein provide new insights into the formation and thermally driven structural order of oligo(ethylene glycol)-terminated SAMs vapor-deposited on Au(111).https://www.mdpi.com/1420-3049/27/17/5377oligo(ethylene glycol)-terminated alkanethiolsself-assembled monolayerssurface structureelectrochemical behaviortemperature effectscanning tunneling microscopy |
| spellingShingle | Young Ji Son Hungu Kang Sicheon Seong Seulki Han Nam-Suk Lee Jaegeun Noh Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition Molecules oligo(ethylene glycol)-terminated alkanethiols self-assembled monolayers surface structure electrochemical behavior temperature effect scanning tunneling microscopy |
| title | Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition |
| title_full | Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition |
| title_fullStr | Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition |
| title_full_unstemmed | Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition |
| title_short | Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition |
| title_sort | thermally driven structural order of oligo ethylene glycol terminated alkanethiol monolayers on au 111 prepared by vapor deposition |
| topic | oligo(ethylene glycol)-terminated alkanethiols self-assembled monolayers surface structure electrochemical behavior temperature effect scanning tunneling microscopy |
| url | https://www.mdpi.com/1420-3049/27/17/5377 |
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