Effect of solution concentration on the formation of ordered domains in pentachlorobenzenethiol self-assembled monolayers on au(111)

Hungu Kang, Eisuke Ito, Tomohiro Hayashi, Masahiko Hara, Jaegeun Noh

Research output: Contribution to journalArticle

Abstract

The surface structures of self-assembled monolayers (SAMs) formed by the adsorption of pentachlorobenzenethiol (PCBT) molecules on Au(111) as a function of solution concentration were examined by means of scanning tunneling microscopy (STM) to understand the effect of concentration on the formation of ordered domains. STM imaging revealed that PCBT SAMs formed in a 0.01 or 1 mM ethanol solution at room temperature for 20 min contained BV small ordered domains in the range of several to 20 nm2 and disordered phases, while PCBT SAMs formed in a 0.1 mM ethanol solution were composed of long-range ordered domains in the range of 20 to 50 nm2 , which can be assigned as a (4 × √3)R45° packing structure. Interestingly, the bright aggregated domains stacked by π-π interactions between PCBT rings were usually observed around boundary regions of ordered domains. In addition, X-ray photoelectron spectroscopy measurements revealed that ordered PCBT SAMs on Au(111) were formed via the chemical interactions between the sulfur atom of PCBT and gold surface. Our results obtained here will be very useful in understanding the formation and structure of PCBT SAMs on gold surfaces.

Original languageEnglish
Pages (from-to)6360-6363
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume16
Issue number6
DOIs
StatePublished - 2016 Jun

Fingerprint

Self assembled monolayers
Scanning tunneling microscopy
Gold
scanning tunneling microscopy
Ethanol
ethyl alcohol
gold
Sulfur
Surface structure
sulfur
X ray photoelectron spectroscopy
photoelectron spectroscopy
interactions
Imaging techniques
Adsorption
Atoms
Molecules
adsorption
rings
room temperature

Keywords

  • Pentachlorobenzenethiol
  • Scanning tunneling microscopy.
  • Self-Assembled monolayers
  • Solution concentration
  • Surface structure

Cite this

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title = "Effect of solution concentration on the formation of ordered domains in pentachlorobenzenethiol self-assembled monolayers on au(111)",
abstract = "The surface structures of self-assembled monolayers (SAMs) formed by the adsorption of pentachlorobenzenethiol (PCBT) molecules on Au(111) as a function of solution concentration were examined by means of scanning tunneling microscopy (STM) to understand the effect of concentration on the formation of ordered domains. STM imaging revealed that PCBT SAMs formed in a 0.01 or 1 mM ethanol solution at room temperature for 20 min contained BV small ordered domains in the range of several to 20 nm2 and disordered phases, while PCBT SAMs formed in a 0.1 mM ethanol solution were composed of long-range ordered domains in the range of 20 to 50 nm2 , which can be assigned as a (4 × √3)R45° packing structure. Interestingly, the bright aggregated domains stacked by π-π interactions between PCBT rings were usually observed around boundary regions of ordered domains. In addition, X-ray photoelectron spectroscopy measurements revealed that ordered PCBT SAMs on Au(111) were formed via the chemical interactions between the sulfur atom of PCBT and gold surface. Our results obtained here will be very useful in understanding the formation and structure of PCBT SAMs on gold surfaces.",
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Effect of solution concentration on the formation of ordered domains in pentachlorobenzenethiol self-assembled monolayers on au(111). / Kang, Hungu; Ito, Eisuke; Hayashi, Tomohiro; Hara, Masahiko; Noh, Jaegeun.

In: Journal of Nanoscience and Nanotechnology, Vol. 16, No. 6, 06.2016, p. 6360-6363.

Research output: Contribution to journalArticle

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AU - Noh, Jaegeun

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