Formation and superlattice of long-range and highly ordered alicyclic selenolate monolayers on Au(1 1 1) studied by scanning tunneling microscopy

Hungu Kang, Hyerim Jeong, Sicheon Seong, Seulki Han, Young Ji Son, Hiroyuki Tahara, Tomohiro Hayashi, Hyo Jae Yoon, Jaegeun Noh

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    8 Citations (Scopus)

    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 × 2√3)R30° 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 (√3.5 × 2√10)R27° 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.

    Original languageEnglish
    Article number151454
    JournalApplied Surface Science
    Volume572
    DOIs
    Publication statusPublished - 2022 Jan 15

    Bibliographical note

    Funding Information:
    This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2012R1A6A1029029, NRF-2018R1D1A1B07048063, NRF-2020R1A6A1A06046728 , and NRF-2021R1A2C2010917 for J. Noh; NRF-2019R1A2C2011003 and NRF-2021M3F3A2A03017999 for H. J. Yoon). A part of this work was also supported by a Scientific Research on Innovative Areas Grant Number JP20H05210 from JSPS.

    Publisher Copyright:
    © 2021 Elsevier B.V.

    Keywords

    • Cyclohexaneselenolate
    • Cyclohexanethiolate
    • Domain formation
    • Scanning tunneling microscopy
    • Self-assembled monolayers
    • Surface structure

    ASJC Scopus subject areas

    • General Chemistry
    • Condensed Matter Physics
    • General Physics and Astronomy
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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