Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s

Zhongming Wei; Tao Li; Karsten Stein Jennum; Marco Santella; Nicolas Emile Bovet; Wenping Hu; Mogens Brøndsted Nielsen; Thomas Bjørnholm; Gemma C. Solomon; Bo Wegge Laursen; Kasper Nørgaard

doi:10.1021/la204340n

Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s

Zhongming Wei, Tao Li, Karsten Stein Jennum, Marco Santella, Nicolas Emile Bovet, Wenping Hu, Mogens Brøndsted Nielsen, Thomas Bjørnholm, Gemma C. Solomon, Bo Wegge Laursen, Kasper Nørgaard

Department of Chemistry

27 Citations (Scopus)

Abstract

Cruciform oligo(phenylene ethynylene)s (OPEs) with an extended tetrathiafulvalene (TTF) donor moiety (OPE5-TTF and OPE3-TTF) and their simple analogues (OPE5-S and OPE3) without conjugated substituents were used to form high-quality self-assembled monolayers (SAMs) on ultraflat gold substrates. Molecular junctions based on these SAMs were investigated using conducting-probe atomic force microscopy (CP-AFM). The TTF substituent changes the molecular orbital energy levels and decreases the HOMO-LUMO energy gap, resulting in a 9-fold increase in conductance for both TTF cruciform OPEs compared to the unsubstituted analogues. The difference in electrical transport properties of the SAMs was reproduced by the theoretical transport calculations for the single molecules.

Original language	English
Journal	Langmuir
Volume	28
Issue number	8
Pages (from-to)	4016–4023
Number of pages	8
ISSN	0743-7463
DOIs	https://doi.org/10.1021/la204340n
Publication status	Published - 28 Feb 2012

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title = "Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s",

abstract = "Cruciform oligo(phenylene ethynylene)s (OPEs) with an extended tetrathiafulvalene (TTF) donor moiety (OPE5-TTF and OPE3-TTF) and their simple analogues (OPE5-S and OPE3) without conjugated substituents were used to form high-quality self-assembled monolayers (SAMs) on ultraflat gold substrates. Molecular junctions based on these SAMs were investigated using conducting-probe atomic force microscopy (CP-AFM). The TTF substituent changes the molecular orbital energy levels and decreases the HOMO-LUMO energy gap, resulting in a 9-fold increase in conductance for both TTF cruciform OPEs compared to the unsubstituted analogues. The difference in electrical transport properties of the SAMs was reproduced by the theoretical transport calculations for the single molecules.",

author = "Zhongming Wei and Tao Li and Jennum, {Karsten Stein} and Marco Santella and Bovet, {Nicolas Emile} and Wenping Hu and Nielsen, {Mogens Br{\o}ndsted} and Thomas Bj{\o}rnholm and Solomon, {Gemma C.} and Laursen, {Bo Wegge} and Kasper N{\o}rgaard",

year = "2012",

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doi = "10.1021/la204340n",

language = "English",

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TY - JOUR

T1 - Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s

AU - Wei, Zhongming

AU - Li, Tao

AU - Jennum, Karsten Stein

AU - Santella, Marco

AU - Bovet, Nicolas Emile

AU - Hu, Wenping

AU - Nielsen, Mogens Brøndsted

AU - Bjørnholm, Thomas

AU - Solomon, Gemma C.

AU - Laursen, Bo Wegge

AU - Nørgaard, Kasper

PY - 2012/2/28

Y1 - 2012/2/28

N2 - Cruciform oligo(phenylene ethynylene)s (OPEs) with an extended tetrathiafulvalene (TTF) donor moiety (OPE5-TTF and OPE3-TTF) and their simple analogues (OPE5-S and OPE3) without conjugated substituents were used to form high-quality self-assembled monolayers (SAMs) on ultraflat gold substrates. Molecular junctions based on these SAMs were investigated using conducting-probe atomic force microscopy (CP-AFM). The TTF substituent changes the molecular orbital energy levels and decreases the HOMO-LUMO energy gap, resulting in a 9-fold increase in conductance for both TTF cruciform OPEs compared to the unsubstituted analogues. The difference in electrical transport properties of the SAMs was reproduced by the theoretical transport calculations for the single molecules.

AB - Cruciform oligo(phenylene ethynylene)s (OPEs) with an extended tetrathiafulvalene (TTF) donor moiety (OPE5-TTF and OPE3-TTF) and their simple analogues (OPE5-S and OPE3) without conjugated substituents were used to form high-quality self-assembled monolayers (SAMs) on ultraflat gold substrates. Molecular junctions based on these SAMs were investigated using conducting-probe atomic force microscopy (CP-AFM). The TTF substituent changes the molecular orbital energy levels and decreases the HOMO-LUMO energy gap, resulting in a 9-fold increase in conductance for both TTF cruciform OPEs compared to the unsubstituted analogues. The difference in electrical transport properties of the SAMs was reproduced by the theoretical transport calculations for the single molecules.

U2 - 10.1021/la204340n

DO - 10.1021/la204340n

M3 - Journal article

C2 - 22283520

SN - 0743-7463

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SP - 4016

EP - 4023

JO - Langmuir

JF - Langmuir

IS - 8

ER -

Molecular junctions based on SAMs of cruciform oligo(phenylene ethynylene)s

Abstract

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