Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide

Dmitry A. Krapchetov; Hong Ma; Alex K.Y. Jen; Daniel A. Fischer; Yueh Lin Loo

doi:10.1021/la0503000

Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide

Dmitry A. Krapchetov, Hong Ma, Alex K.Y. Jen, Daniel A. Fischer, Yueh Lin Loo

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Abstract

The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor.

Original language	English (US)
Pages (from-to)	5887-5893
Number of pages	7
Journal	Langmuir
Volume	21
Issue number	13
DOIs	https://doi.org/10.1021/la0503000
State	Published - Jun 21 2005

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Spectroscopy
General Materials Science
Surfaces and Interfaces
Electrochemistry

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10.1021/la0503000

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title = "Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide",

abstract = "The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor.",

author = "Krapchetov, {Dmitry A.} and Hong Ma and Jen, {Alex K.Y.} and Fischer, {Daniel A.} and Loo, {Yueh Lin}",

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T1 - Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide

AU - Krapchetov, Dmitry A.

AU - Ma, Hong

AU - Jen, Alex K.Y.

AU - Fischer, Daniel A.

AU - Loo, Yueh Lin

PY - 2005/6/21

Y1 - 2005/6/21

N2 - The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor.

AB - The assembly of terphenyldithiol (TPDT) and quaterphenyldithiol (QPDT) on gold and gallium arsenide from ethanol (EtOH), tetrahydrofuran (THF), and solutions consisting of both solvents has been characterized by near-edge X-ray absorption fine structure spectroscopy. The surface coverage and the average orientation of both TPDT and QPDT on gold are solvent-independent. These molecules readily form monolayers on gold with an ensemble-average backbone tilt of 30°±3° from the substrate normal. In sharp contrast, the assembly of TPDT and QPDT on gallium arsenide is extremely solvent-sensitive. At high ethanol fractions, both molecules form monolayers with an ensemble-average orientation that is indistinguishable from those on gold substrates. At low ethanol fractions and in pure THF, however, these molecules are disordered on gallium arsenide and the surface coverage is poor.

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Solvent-dependent assembly of terphenyl- And quaterphenyldithiol on gold and gallium arsenide

Abstract

All Science Journal Classification (ASJC) codes

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