Surface structures and adsorption states of self-assembled monolayers formed by various COOH-terminated alkanethiols on Au(111)

Kaoru Konno, Eisuke Ito, Jaegeun Noh, Masahiko Hara

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9 Citations (Scopus)

Abstract

Surface structures and adsorption states of self-assembled monolayers (SAMs) formed by COOH-terminated alkanethiols (ATs) with different alkyl chain lengths were examined by scanning tunneling microscopy (STM), contact angle measurement, and X-ray photoelectron spectroscopy (XPS). STM imaging reveals that COOH-terminated ATs with longer alkyl chains [HS(CH2) nCOOH, n ≥ 7] can easily form well-ordered SAMs, while COOH-terminated ATs with shorter alkyl chains hardly form ordered SAMs [HS(CH2)nCOOH, n ≤ 5], From contact angle and XPS measurements, however, we found that the most surface characteristics, such as surface wettability as well as the adsorption state and the amount of adsorbed molecules, are independent of alkyl chain length. In this study, we elucidate that the intermolecular interaction between alkyl chains is a very important factor in obtaining two-dimensional well-ordered COOH-terminated SAMs.

Original languageEnglish
Pages (from-to)405-408
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number1 B
DOIs
StatePublished - 2006 Jan 20

Fingerprint

Self assembled monolayers
Surface structure
Adsorption
adsorption
scanning tunneling microscopy
Scanning tunneling microscopy
Chain length
photoelectron spectroscopy
Contact angle
X ray photoelectron spectroscopy
wettability
x rays
Angle measurement
Wetting
Imaging techniques
Molecules
molecules
interactions

Keywords

  • Adsorption state
  • Scanning tunneling microscopy (STM)
  • Self-assembled monolayers
  • Surface structure
  • X-ray photoelectron spectroscopy (XPS)

Cite this

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title = "Surface structures and adsorption states of self-assembled monolayers formed by various COOH-terminated alkanethiols on Au(111)",
abstract = "Surface structures and adsorption states of self-assembled monolayers (SAMs) formed by COOH-terminated alkanethiols (ATs) with different alkyl chain lengths were examined by scanning tunneling microscopy (STM), contact angle measurement, and X-ray photoelectron spectroscopy (XPS). STM imaging reveals that COOH-terminated ATs with longer alkyl chains [HS(CH2) nCOOH, n ≥ 7] can easily form well-ordered SAMs, while COOH-terminated ATs with shorter alkyl chains hardly form ordered SAMs [HS(CH2)nCOOH, n ≤ 5], From contact angle and XPS measurements, however, we found that the most surface characteristics, such as surface wettability as well as the adsorption state and the amount of adsorbed molecules, are independent of alkyl chain length. In this study, we elucidate that the intermolecular interaction between alkyl chains is a very important factor in obtaining two-dimensional well-ordered COOH-terminated SAMs.",
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T1 - Surface structures and adsorption states of self-assembled monolayers formed by various COOH-terminated alkanethiols on Au(111)

AU - Konno, Kaoru

AU - Ito, Eisuke

AU - Noh, Jaegeun

AU - Hara, Masahiko

PY - 2006/1/20

Y1 - 2006/1/20

N2 - Surface structures and adsorption states of self-assembled monolayers (SAMs) formed by COOH-terminated alkanethiols (ATs) with different alkyl chain lengths were examined by scanning tunneling microscopy (STM), contact angle measurement, and X-ray photoelectron spectroscopy (XPS). STM imaging reveals that COOH-terminated ATs with longer alkyl chains [HS(CH2) nCOOH, n ≥ 7] can easily form well-ordered SAMs, while COOH-terminated ATs with shorter alkyl chains hardly form ordered SAMs [HS(CH2)nCOOH, n ≤ 5], From contact angle and XPS measurements, however, we found that the most surface characteristics, such as surface wettability as well as the adsorption state and the amount of adsorbed molecules, are independent of alkyl chain length. In this study, we elucidate that the intermolecular interaction between alkyl chains is a very important factor in obtaining two-dimensional well-ordered COOH-terminated SAMs.

AB - Surface structures and adsorption states of self-assembled monolayers (SAMs) formed by COOH-terminated alkanethiols (ATs) with different alkyl chain lengths were examined by scanning tunneling microscopy (STM), contact angle measurement, and X-ray photoelectron spectroscopy (XPS). STM imaging reveals that COOH-terminated ATs with longer alkyl chains [HS(CH2) nCOOH, n ≥ 7] can easily form well-ordered SAMs, while COOH-terminated ATs with shorter alkyl chains hardly form ordered SAMs [HS(CH2)nCOOH, n ≤ 5], From contact angle and XPS measurements, however, we found that the most surface characteristics, such as surface wettability as well as the adsorption state and the amount of adsorbed molecules, are independent of alkyl chain length. In this study, we elucidate that the intermolecular interaction between alkyl chains is a very important factor in obtaining two-dimensional well-ordered COOH-terminated SAMs.

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KW - Scanning tunneling microscopy (STM)

KW - Self-assembled monolayers

KW - Surface structure

KW - X-ray photoelectron spectroscopy (XPS)

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