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 journalArticle

28 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)5755-5765
Number of pages11
JournalLangmuir
Volume24
Issue number11
DOIs
Publication statusPublished - Jun 3 2008

Fingerprint

ITO (semiconductors)
Oxides
Monolayers
Metallorganic chemical vapor deposition
Self assembled monolayers
conduction
Cyclic voltammetry
metalorganic chemical vapor deposition
oxides
electron transfer
Molecular Probes
Molecules
Covalent bonds
Electrons
probes
covalent bonds
Chemisorption
Synchrotrons
Electronic properties
chemisorption

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers. / Li, Jianfeng; Wang, Lian; Liu, Jun; Evmenenko, Guennadi; Dutta, Pulak; Marks, Tobin J.

In: Langmuir, Vol. 24, No. 11, 03.06.2008, p. 5755-5765.

Research output: Contribution to journalArticle

Li, Jianfeng ; Wang, Lian ; Liu, Jun ; Evmenenko, Guennadi ; Dutta, Pulak ; Marks, Tobin J. / Characterization of transparent conducting oxide surfaces using self-assembled electroactive monolayers. In: Langmuir. 2008 ; Vol. 24, No. 11. pp. 5755-5765.
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