Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers

Jianfeng Li; Lian Wang; Jun Liu; Guennadi Evmenenko; Pulak Dutta; Tobin J. Marks

doi:10.1021/la704038g

Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers

Jianfeng Li, Lian Wang, Jun Liu, Guennadi Evmenenko, Pulak Dutta, Tobin J. Marks

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

32 Scopus citations

Abstract

The electronic properties of various transparent conducting oxide (TCO) surfaces are probed electrochemically via self-assembled monolayers (SAMs). A novel graftable probe molecule having a tethered trichlorosilyl group and a redox-active ferrocenyl functionality (Fc(CH₂)₄SiCl ₃) is synthesized for this purpose. This molecule can be self-assembled via covalent bonds to form monolayers on various TCO surfaces. On as-received ITO, saturation coverage of 6.6 × 10^-10 mol/cm² by a close-packed monolayer and an electron-transfer rate of 6.65 s^-1 is achieved after 9 h of chemisorption, as determined by cyclic voltammetry (CV) and synchrotron X-ray reflectivity. With this molecular probe, it is found that O₂ plasma-treated ITO has a significantly greater electroactive coverage of 7.9 × 10^-10 mol/cm ² than as-received ITO. CV studies of this redox SAM on five different TCO surfaces reveal that MOCVD-derived CdO exhibits the greatest electroactive coverage (8.1 × 10^-10 mol/cm²) and MOCVD-derived ZITO (ZnIn_2.0Sn_1.5O) exhibits the highest electron transfer rate (7.12 s^-1).

Original language	English (US)
Pages (from-to)	5755-5765
Number of pages	11
Journal	Langmuir
Volume	24
Issue number	11
DOIs	https://doi.org/10.1021/la704038g
State	Published - Jun 3 2008

ASJC Scopus subject areas

Condensed Matter Physics
Spectroscopy
General Materials Science
Surfaces and Interfaces
Electrochemistry

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10.1021/la704038g

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title = "Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers",

abstract = "The electronic properties of various transparent conducting oxide (TCO) surfaces are probed electrochemically via self-assembled monolayers (SAMs). A novel graftable probe molecule having a tethered trichlorosilyl group and a redox-active ferrocenyl functionality (Fc(CH2)4SiCl 3) is synthesized for this purpose. This molecule can be self-assembled via covalent bonds to form monolayers on various TCO surfaces. On as-received ITO, saturation coverage of 6.6 × 10-10 mol/cm2 by a close-packed monolayer and an electron-transfer rate of 6.65 s-1 is achieved after 9 h of chemisorption, as determined by cyclic voltammetry (CV) and synchrotron X-ray reflectivity. With this molecular probe, it is found that O2 plasma-treated ITO has a significantly greater electroactive coverage of 7.9 × 10-10 mol/cm 2 than as-received ITO. CV studies of this redox SAM on five different TCO surfaces reveal that MOCVD-derived CdO exhibits the greatest electroactive coverage (8.1 × 10-10 mol/cm2) and MOCVD-derived ZITO (ZnIn2.0Sn1.5O) exhibits the highest electron transfer rate (7.12 s-1).",

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AU - Li, Jianfeng

AU - Wang, Lian

AU - Liu, Jun

AU - Evmenenko, Guennadi

AU - Dutta, Pulak

AU - Marks, Tobin J.

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AB - The electronic properties of various transparent conducting oxide (TCO) surfaces are probed electrochemically via self-assembled monolayers (SAMs). A novel graftable probe molecule having a tethered trichlorosilyl group and a redox-active ferrocenyl functionality (Fc(CH2)4SiCl 3) is synthesized for this purpose. This molecule can be self-assembled via covalent bonds to form monolayers on various TCO surfaces. On as-received ITO, saturation coverage of 6.6 × 10-10 mol/cm2 by a close-packed monolayer and an electron-transfer rate of 6.65 s-1 is achieved after 9 h of chemisorption, as determined by cyclic voltammetry (CV) and synchrotron X-ray reflectivity. With this molecular probe, it is found that O2 plasma-treated ITO has a significantly greater electroactive coverage of 7.9 × 10-10 mol/cm 2 than as-received ITO. CV studies of this redox SAM on five different TCO surfaces reveal that MOCVD-derived CdO exhibits the greatest electroactive coverage (8.1 × 10-10 mol/cm2) and MOCVD-derived ZITO (ZnIn2.0Sn1.5O) exhibits the highest electron transfer rate (7.12 s-1).

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Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers

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