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Son YJ, Kang H, Seong S, Han S, Lee NS, Noh J. Thermally Driven Structural Order of Oligo(Ethylene Glycol)-Terminated Alkanethiol Monolayers on Au(111) Prepared by Vapor Deposition. Molecules 2022; 27:molecules27175377. [PMID: 36080145 PMCID: PMC9457651 DOI: 10.3390/molecules27175377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/22/2022] [Accepted: 08/22/2022] [Indexed: 11/16/2022] Open
Abstract
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 (CH3O(CH2)2O(CH2)2SH, 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).
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Affiliation(s)
- Young Ji Son
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
| | - Hungu Kang
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
| | - Sicheon Seong
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
| | - Seulki Han
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
| | - Nam-Suk Lee
- National Institute for Nanomaterials Technology, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jaegeun Noh
- Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
- Institute of Nano Science and Technology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
- Correspondence:
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Park T, Kang H, Ito E, Noh J. Self‐Assembled Monolayers of Alkanethioacetates on Au(111) in Ammonium Hydroxide Solution. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Taesung Park
- Department of Chemistry Hanyang University Seongdong‐gu, Seoul 04763 Korea
| | - Hungu Kang
- Department of Chemistry Hanyang University Seongdong‐gu, Seoul 04763 Korea
| | - Eisuke Ito
- Chemical Materials Evaluation and Research Base (CEREBA) Higashi 1‐1‐1, AIST Central 5‐2, Tsukuba, Ibaraki 305‐8565 Japan
| | - Jaegeun Noh
- Department of Chemistry Hanyang University Seongdong‐gu, Seoul 04763 Korea
- Institute of Nano Science and Technology Hanyang University Seongdong‐gu, Seoul 04763 Korea
- Research Institute for Convergence of Basic Science Hanyang University Seongdong‐gu, Seoul 04763 Korea
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