Scanning tunneling microscopy investigation of tricycloquinazoline liquid crystals on gold

Renate Hiesgen; Holger Schönherr; Sandeep Kumar; Helmut Ringsdorf; Dieter Meissner

doi:10.1016/s0040-6090(99)00685-9

Scanning tunneling microscopy investigation of tricycloquinazoline liquid crystals on gold

Renate Hiesgen, Holger Schönherr, Sandeep Kumar, Helmut Ringsdorf, Dieter Meissner

Research output: Contribution to journal › Article › peer-review

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Abstract

Self-assembled monolayers (SAMs) of hexaalkylthioether derivatives of tricycloquinazoline (TCQ) on Au(111) and tungsten diselenide (WSe₂) were investigated by scanning tunneling microscopy (STM). The Au(111) surfaces were found to be etched by the thioether containing solutions. Corroded surfaces which are similar to gold surfaces that were coated with SAMs of thiols or disulfides were revealed by STM. Atomic adsorption spectroscopy proved that an amount of gold that corresponds to ca. 30% of a monolayer was dissolved in the assembly solutions. On gold, the aromatic cores of the molecules were found to be in face-on orientation. The alkyl substituents were in most cases folded upwards and shielding the aromatic cores. Only after long immersion times were crystalline areas observed locally, in which the alkyl chains were lying flat on the gold surface. On WSe₂ mono- and multilayers of TCQ molecules in face-on orientation could be imaged by STM. The observed columnar structures displayed long-range order.

Original language	English
Pages (from-to)	241-249
Number of pages	9
Journal	Thin Solid Films
Volume	358
Issue number	1
DOIs	https://doi.org/10.1016/s0040-6090(99)00685-9
State	Published - 10 Jan 2000
Externally published	Yes

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title = "Scanning tunneling microscopy investigation of tricycloquinazoline liquid crystals on gold",

abstract = "Self-assembled monolayers (SAMs) of hexaalkylthioether derivatives of tricycloquinazoline (TCQ) on Au(111) and tungsten diselenide (WSe2) were investigated by scanning tunneling microscopy (STM). The Au(111) surfaces were found to be etched by the thioether containing solutions. Corroded surfaces which are similar to gold surfaces that were coated with SAMs of thiols or disulfides were revealed by STM. Atomic adsorption spectroscopy proved that an amount of gold that corresponds to ca. 30% of a monolayer was dissolved in the assembly solutions. On gold, the aromatic cores of the molecules were found to be in face-on orientation. The alkyl substituents were in most cases folded upwards and shielding the aromatic cores. Only after long immersion times were crystalline areas observed locally, in which the alkyl chains were lying flat on the gold surface. On WSe2 mono- and multilayers of TCQ molecules in face-on orientation could be imaged by STM. The observed columnar structures displayed long-range order.",

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AU - Hiesgen, Renate

AU - Schönherr, Holger

AU - Kumar, Sandeep

AU - Ringsdorf, Helmut

AU - Meissner, Dieter

PY - 2000/1/10

Y1 - 2000/1/10

N2 - Self-assembled monolayers (SAMs) of hexaalkylthioether derivatives of tricycloquinazoline (TCQ) on Au(111) and tungsten diselenide (WSe2) were investigated by scanning tunneling microscopy (STM). The Au(111) surfaces were found to be etched by the thioether containing solutions. Corroded surfaces which are similar to gold surfaces that were coated with SAMs of thiols or disulfides were revealed by STM. Atomic adsorption spectroscopy proved that an amount of gold that corresponds to ca. 30% of a monolayer was dissolved in the assembly solutions. On gold, the aromatic cores of the molecules were found to be in face-on orientation. The alkyl substituents were in most cases folded upwards and shielding the aromatic cores. Only after long immersion times were crystalline areas observed locally, in which the alkyl chains were lying flat on the gold surface. On WSe2 mono- and multilayers of TCQ molecules in face-on orientation could be imaged by STM. The observed columnar structures displayed long-range order.

AB - Self-assembled monolayers (SAMs) of hexaalkylthioether derivatives of tricycloquinazoline (TCQ) on Au(111) and tungsten diselenide (WSe2) were investigated by scanning tunneling microscopy (STM). The Au(111) surfaces were found to be etched by the thioether containing solutions. Corroded surfaces which are similar to gold surfaces that were coated with SAMs of thiols or disulfides were revealed by STM. Atomic adsorption spectroscopy proved that an amount of gold that corresponds to ca. 30% of a monolayer was dissolved in the assembly solutions. On gold, the aromatic cores of the molecules were found to be in face-on orientation. The alkyl substituents were in most cases folded upwards and shielding the aromatic cores. Only after long immersion times were crystalline areas observed locally, in which the alkyl chains were lying flat on the gold surface. On WSe2 mono- and multilayers of TCQ molecules in face-on orientation could be imaged by STM. The observed columnar structures displayed long-range order.

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Scanning tunneling microscopy investigation of tricycloquinazoline liquid crystals on gold

Abstract

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