The structure of organic langmuir films on liquid metal surfaces

H. Kraack; M. Deutsch; B. M. Ocko; P. S. Pershan

doi:10.1016/s0168-583x(02)01724-x

The structure of organic langmuir films on liquid metal surfaces

H. Kraack, M. Deutsch, B. M. Ocko, P. S. Pershan

Department of Physics - at Bar-Ilan University

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

15 Scopus citations

Abstract

Langmuir films (LFs) on water have long been studied for their interest for basic science and their numerous applications in chemistry, physics, materials science and biology. We present here Å-resolution synchrotron X-ray studies of the structure of stearic acid LFs on a liquid mercury surface. At low coverage, ≥110 Å²/mol, a 2D gas phase of flat-lying molecules is observed. At high coverage, ≤23 Å²/mol, two different hexatic phases of standing-up molecules are observed. At intermediate coverage, 52≤A≤110 Å²/mol, novel single- and double-layered phases of flat-lying molecular dimers are found, exhibiting a 1D in-layer order. Such flat-lying phases were not hitherto observed in any LF. Measurements on LFs of fatty acids of other chain lengths indicate that this structure is generic to chain molecules on mercury, although the existence of some of the flat-lying phases, and the observed phase sequence, depend on the chain length. Organic LFs on Hg, and in particular the new flat-lying phases, should provide a broader nano-structural tunability range for molecular electronic device construction than most solid-supported self-assembled monolayers used at present.

Original language	English
Pages (from-to)	363-370
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	200
DOIs	https://doi.org/10.1016/s0168-583x(02)01724-x
State	Published - Jan 2003

Bibliographical note

Funding Information:
Support to P.S.P. by the US DOE (grant no. DE-FG02-88-ER45379) and the National Science Foundation (grant no. DMR-01-124936) and to M.D. by the US–Israel Binational Science Foundation, Jerusalem, is gratefully acknowledged. We thank D. Vaknin (Ames) for generous advice and drawings of the trough. BNL is supported by the US DOE (contract no. DE-AC02-98CH10886).

Funding

Support to P.S.P. by the US DOE (grant no. DE-FG02-88-ER45379) and the National Science Foundation (grant no. DMR-01-124936) and to M.D. by the US–Israel Binational Science Foundation, Jerusalem, is gratefully acknowledged. We thank D. Vaknin (Ames) for generous advice and drawings of the trough. BNL is supported by the US DOE (contract no. DE-AC02-98CH10886).

Funders	Funder number
National Science Foundation	DMR-01-124936
U.S. Department of Energy	DE-FG02-88-ER45379
United States-Israel Binational Science Foundation	DE-AC02-98CH10886

Keywords

2D phases
Langmuir films
Liquid metals
Monolayers
Surface

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10.1016/s0168-583x(02)01724-x

Cite this

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title = "The structure of organic langmuir films on liquid metal surfaces",

abstract = "Langmuir films (LFs) on water have long been studied for their interest for basic science and their numerous applications in chemistry, physics, materials science and biology. We present here {\AA}-resolution synchrotron X-ray studies of the structure of stearic acid LFs on a liquid mercury surface. At low coverage, ≥110 {\AA}2/mol, a 2D gas phase of flat-lying molecules is observed. At high coverage, ≤23 {\AA}2/mol, two different hexatic phases of standing-up molecules are observed. At intermediate coverage, 52≤A≤110 {\AA}2/mol, novel single- and double-layered phases of flat-lying molecular dimers are found, exhibiting a 1D in-layer order. Such flat-lying phases were not hitherto observed in any LF. Measurements on LFs of fatty acids of other chain lengths indicate that this structure is generic to chain molecules on mercury, although the existence of some of the flat-lying phases, and the observed phase sequence, depend on the chain length. Organic LFs on Hg, and in particular the new flat-lying phases, should provide a broader nano-structural tunability range for molecular electronic device construction than most solid-supported self-assembled monolayers used at present.",

keywords = "2D phases, Langmuir films, Liquid metals, Monolayers, Surface",

author = "H. Kraack and M. Deutsch and Ocko, {B. M.} and Pershan, {P. S.}",

note = "Funding Information: Support to P.S.P. by the US DOE (grant no. DE-FG02-88-ER45379) and the National Science Foundation (grant no. DMR-01-124936) and to M.D. by the US–Israel Binational Science Foundation, Jerusalem, is gratefully acknowledged. We thank D. Vaknin (Ames) for generous advice and drawings of the trough. BNL is supported by the US DOE (contract no. DE-AC02-98CH10886).",

year = "2003",

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doi = "10.1016/s0168-583x(02)01724-x",

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AU - Kraack, H.

AU - Deutsch, M.

AU - Ocko, B. M.

AU - Pershan, P. S.

N1 - Funding Information: Support to P.S.P. by the US DOE (grant no. DE-FG02-88-ER45379) and the National Science Foundation (grant no. DMR-01-124936) and to M.D. by the US–Israel Binational Science Foundation, Jerusalem, is gratefully acknowledged. We thank D. Vaknin (Ames) for generous advice and drawings of the trough. BNL is supported by the US DOE (contract no. DE-AC02-98CH10886).

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N2 - Langmuir films (LFs) on water have long been studied for their interest for basic science and their numerous applications in chemistry, physics, materials science and biology. We present here Å-resolution synchrotron X-ray studies of the structure of stearic acid LFs on a liquid mercury surface. At low coverage, ≥110 Å2/mol, a 2D gas phase of flat-lying molecules is observed. At high coverage, ≤23 Å2/mol, two different hexatic phases of standing-up molecules are observed. At intermediate coverage, 52≤A≤110 Å2/mol, novel single- and double-layered phases of flat-lying molecular dimers are found, exhibiting a 1D in-layer order. Such flat-lying phases were not hitherto observed in any LF. Measurements on LFs of fatty acids of other chain lengths indicate that this structure is generic to chain molecules on mercury, although the existence of some of the flat-lying phases, and the observed phase sequence, depend on the chain length. Organic LFs on Hg, and in particular the new flat-lying phases, should provide a broader nano-structural tunability range for molecular electronic device construction than most solid-supported self-assembled monolayers used at present.

AB - Langmuir films (LFs) on water have long been studied for their interest for basic science and their numerous applications in chemistry, physics, materials science and biology. We present here Å-resolution synchrotron X-ray studies of the structure of stearic acid LFs on a liquid mercury surface. At low coverage, ≥110 Å2/mol, a 2D gas phase of flat-lying molecules is observed. At high coverage, ≤23 Å2/mol, two different hexatic phases of standing-up molecules are observed. At intermediate coverage, 52≤A≤110 Å2/mol, novel single- and double-layered phases of flat-lying molecular dimers are found, exhibiting a 1D in-layer order. Such flat-lying phases were not hitherto observed in any LF. Measurements on LFs of fatty acids of other chain lengths indicate that this structure is generic to chain molecules on mercury, although the existence of some of the flat-lying phases, and the observed phase sequence, depend on the chain length. Organic LFs on Hg, and in particular the new flat-lying phases, should provide a broader nano-structural tunability range for molecular electronic device construction than most solid-supported self-assembled monolayers used at present.

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ER -

The structure of organic langmuir films on liquid metal surfaces

Abstract

Bibliographical note

Funding

Keywords

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