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Titolo:
Electrochemical characterization of self-assembled alkylsiloxane monolayers on indium-tin oxide (ITO) semiconductor electrodes
Autore:
Hillebrandt, H; Tanaka, M;
Indirizzi:
Tech Univ Munich, Lehrstuhl Biophys, Dept Phys, D-85748 Garching, Germany Tech Univ Munich Garching Germany D-85748 hys, D-85748 Garching, Germany
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 19, volume: 105, anno: 2001,
pagine: 4270 - 4276
SICI:
1520-6106(20010517)105:19<4270:ECOSAM>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMPEDANCE SPECTROSCOPY; STRUCTURAL CHARACTERIZATION; AQUEOUS-ELECTROLYTES; SUPPORTED MEMBRANES; THIOL MONOLAYERS; GOLD ELECTRODES; LIPID BILAYER; FILMS; TEMPERATURE; DEPOSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Tanaka, M Tech Univ Munich, Lehrstuhl Biophys, Dept Phys, E22,James FranckStr, D-85748 Garching, Germany Tech Univ Munich E22,James Franck Str Garching Germany D-85748
Citazione:
H. Hillebrandt e M. Tanaka, "Electrochemical characterization of self-assembled alkylsiloxane monolayers on indium-tin oxide (ITO) semiconductor electrodes", J PHYS CH B, 105(19), 2001, pp. 4270-4276

Abstract

Self-assembled monolayers (SAMs) of octyltrimethoxysilane (OTMS) were deposited onto indium-tin oxide (ITO) electrode surfaces. Contact angle measurements evidenced the hydrophobicity and homogeneity of the functionalized surface despite the intrinsic surface roughness of the polycrystalline ITO electrodes. The electrochemical properties of the OTMS monolayers were quantitatively analyzed in terms of resistance, dielectric thickness, diffusion constant, and defect area by cyclic voltammetry and impedance spectroscopy. It has been demonstrated that the alkylsiloxane monolayer acts as a diffusion barrier for ions in the electrolyte. Furthermore, a significant suppression of the charge transfer at the interface was observed, demonstrating thepassivation effect of the monolayers against electrochemistry. In addition, the effect of alkyl chain length on the electrochemical properties was briefly analyzed by using octadecyltrimethoxysilane (ODTMS). The defect area of this self-assembled monolayer was reduced to 0.2%.

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Documento generato il 05/04/20 alle ore 19:37:00