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Selective anchoring groups for molecular electronic junctions with ITO electrodes

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Selective anchoring groups for molecular electronic junctions with ITO electrodes. / Planje, I.J.; Davidson, R.J.; Vezzoli, A. et al.
In: ACS Sensors, Vol. 6, No. 2, 26.02.2021, p. 530-537.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Planje, IJ, Davidson, RJ, Vezzoli, A, Daaoub, A, Sangtarash, S, Sadeghi, H, Martín, S, Cea, P, Lambert, CJ, Beeby, A, Higgins, SJ & Nichols, RJ 2021, 'Selective anchoring groups for molecular electronic junctions with ITO electrodes', ACS Sensors, vol. 6, no. 2, pp. 530-537. https://doi.org/10.1021/acssensors.0c02205

APA

Planje, I. J., Davidson, R. J., Vezzoli, A., Daaoub, A., Sangtarash, S., Sadeghi, H., Martín, S., Cea, P., Lambert, C. J., Beeby, A., Higgins, S. J., & Nichols, R. J. (2021). Selective anchoring groups for molecular electronic junctions with ITO electrodes. ACS Sensors, 6(2), 530-537. https://doi.org/10.1021/acssensors.0c02205

Vancouver

Planje IJ, Davidson RJ, Vezzoli A, Daaoub A, Sangtarash S, Sadeghi H et al. Selective anchoring groups for molecular electronic junctions with ITO electrodes. ACS Sensors. 2021 Feb 26;6(2):530-537. Epub 2021 Jan 21. doi: 10.1021/acssensors.0c02205

Author

Planje, I.J. ; Davidson, R.J. ; Vezzoli, A. et al. / Selective anchoring groups for molecular electronic junctions with ITO electrodes. In: ACS Sensors. 2021 ; Vol. 6, No. 2. pp. 530-537.

Bibtex

@article{5510710161c94230b980ca32cda755fd,
title = "Selective anchoring groups for molecular electronic junctions with ITO electrodes",
abstract = "Indium tin oxide (ITO) is an attractive substrate for single-molecule electronics since it is transparent while maintaining electrical conductivity. Although it has been used before as a contacting electrode in single-molecule electrical studies, these studies have been limited to the use of carboxylic acid terminal groups for binding molecular wires to the ITO substrates. There is thus the need to investigate other anchoring groups with potential for binding effectively to ITO. With this aim, we have investigated the single-molecule conductance of a series of eight tolane or “tolane-like” molecular wires with a variety of surface binding groups. We first used gold-molecule- gold junctions to identify promising targets for ITO selectivity. We then assessed the propensity and selectivity of carboxylic acid, cyanoacrylic acid, and pyridinium-squarate to bind to ITO and promote the formation of molecular heterojunctions. We found that pyridinium squarate zwitterions display excellent selectivity for binding to ITO over gold surfaces, with contact resistivity comparable to that of carboxylic acids. These single-molecule experiments are complemented by surface chemical characterization with X-ray photoelectron spectroscopy, quartz crystal microbalance, contact angle determination, and nanolithography using an atomic force miscroscope. Finally, we report the first density-functional theory calculations involving ITO electrodes to model charge transport through ITO-molecule-gold heterojunctions.",
keywords = "Anchoring groups, Indium tin oxide, ITO, Scanning tunneling microscopy, Single-molecule conductance, STM break junction, STM-I(t), X-ray photoelectron spectroscopy, Carboxylic acids, Contact angle, Density functional theory, Electrodes, Gold, Heterojunctions, Indium compounds, Molecules, Nanowires, Tin oxides, X ray photoelectron spectroscopy, Contact angle determination, Contact resistivities, Electrical conductivity, Electrical studies, Molecular electronic junction, Single molecule conductance, Single molecule experiments, Single-molecule electronics, Substrates",
author = "I.J. Planje and R.J. Davidson and A. Vezzoli and A. Daaoub and S. Sangtarash and H. Sadeghi and S. Mart{\'i}n and P. Cea and C.J. Lambert and A. Beeby and S.J. Higgins and R.J. Nichols",
year = "2021",
month = feb,
day = "26",
doi = "10.1021/acssensors.0c02205",
language = "English",
volume = "6",
pages = "530--537",
journal = "ACS Sensors",
issn = "2379-3694",
publisher = "American Chemical Society",
number = "2",

}

RIS

TY - JOUR

T1 - Selective anchoring groups for molecular electronic junctions with ITO electrodes

AU - Planje, I.J.

AU - Davidson, R.J.

AU - Vezzoli, A.

AU - Daaoub, A.

AU - Sangtarash, S.

AU - Sadeghi, H.

AU - Martín, S.

AU - Cea, P.

AU - Lambert, C.J.

AU - Beeby, A.

AU - Higgins, S.J.

AU - Nichols, R.J.

PY - 2021/2/26

Y1 - 2021/2/26

N2 - Indium tin oxide (ITO) is an attractive substrate for single-molecule electronics since it is transparent while maintaining electrical conductivity. Although it has been used before as a contacting electrode in single-molecule electrical studies, these studies have been limited to the use of carboxylic acid terminal groups for binding molecular wires to the ITO substrates. There is thus the need to investigate other anchoring groups with potential for binding effectively to ITO. With this aim, we have investigated the single-molecule conductance of a series of eight tolane or “tolane-like” molecular wires with a variety of surface binding groups. We first used gold-molecule- gold junctions to identify promising targets for ITO selectivity. We then assessed the propensity and selectivity of carboxylic acid, cyanoacrylic acid, and pyridinium-squarate to bind to ITO and promote the formation of molecular heterojunctions. We found that pyridinium squarate zwitterions display excellent selectivity for binding to ITO over gold surfaces, with contact resistivity comparable to that of carboxylic acids. These single-molecule experiments are complemented by surface chemical characterization with X-ray photoelectron spectroscopy, quartz crystal microbalance, contact angle determination, and nanolithography using an atomic force miscroscope. Finally, we report the first density-functional theory calculations involving ITO electrodes to model charge transport through ITO-molecule-gold heterojunctions.

AB - Indium tin oxide (ITO) is an attractive substrate for single-molecule electronics since it is transparent while maintaining electrical conductivity. Although it has been used before as a contacting electrode in single-molecule electrical studies, these studies have been limited to the use of carboxylic acid terminal groups for binding molecular wires to the ITO substrates. There is thus the need to investigate other anchoring groups with potential for binding effectively to ITO. With this aim, we have investigated the single-molecule conductance of a series of eight tolane or “tolane-like” molecular wires with a variety of surface binding groups. We first used gold-molecule- gold junctions to identify promising targets for ITO selectivity. We then assessed the propensity and selectivity of carboxylic acid, cyanoacrylic acid, and pyridinium-squarate to bind to ITO and promote the formation of molecular heterojunctions. We found that pyridinium squarate zwitterions display excellent selectivity for binding to ITO over gold surfaces, with contact resistivity comparable to that of carboxylic acids. These single-molecule experiments are complemented by surface chemical characterization with X-ray photoelectron spectroscopy, quartz crystal microbalance, contact angle determination, and nanolithography using an atomic force miscroscope. Finally, we report the first density-functional theory calculations involving ITO electrodes to model charge transport through ITO-molecule-gold heterojunctions.

KW - Anchoring groups

KW - Indium tin oxide

KW - ITO

KW - Scanning tunneling microscopy

KW - Single-molecule conductance

KW - STM break junction

KW - STM-I(t)

KW - X-ray photoelectron spectroscopy

KW - Carboxylic acids

KW - Contact angle

KW - Density functional theory

KW - Electrodes

KW - Gold

KW - Heterojunctions

KW - Indium compounds

KW - Molecules

KW - Nanowires

KW - Tin oxides

KW - X ray photoelectron spectroscopy

KW - Contact angle determination

KW - Contact resistivities

KW - Electrical conductivity

KW - Electrical studies

KW - Molecular electronic junction

KW - Single molecule conductance

KW - Single molecule experiments

KW - Single-molecule electronics

KW - Substrates

U2 - 10.1021/acssensors.0c02205

DO - 10.1021/acssensors.0c02205

M3 - Journal article

VL - 6

SP - 530

EP - 537

JO - ACS Sensors

JF - ACS Sensors

SN - 2379-3694

IS - 2

ER -