"Perfect" Electrochemical Molecular Sieving by Thin and Ultrathin Metallopolymeric Films

Suzanne Bélanger, Keith J. Stevenson, Shikata A. Mudakha, Joseph T Hupp

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Oxidative electropolymerization at glassy carbon and indium-tin-oxide electrodes from unbuffered aqueous solutions of Fe(5-NH2-phen)32+ and Ru(5-NH2-phen)32+ yields electrode-supported films that self-limit at thicknesses of ca. 50 and 2 nm, respectively. Electrodeposition is characterized by formation of nonelectroactive films, which are electronically insulating at least over the electrochemical potential range of 0 to + 1 V. Electrochemical measurements of redox-active probe molecules demonstrate that these films exhibit highly selective molecular sieving. Neutral permeants and hydrophobic permeants are observed to penetrate the polymeric coating more rapidly than charged or hydrophilic forms. Atomic force microscopy, UV-vis spectroscopy, and X-ray photoelectron spectroscopy were used to correlate the polymeric molecular structure with the observed electrochemical reactivity. Molecular sieving behavior is discussed in terms of a membrane transport model implying that the films are comprised of metallopolymeric molecular cavities of uniform size and distribution.

Original languageEnglish
Pages (from-to)837-843
Number of pages7
JournalLangmuir
Volume15
Issue number3
Publication statusPublished - Feb 2 1999

Fingerprint

Ultrathin films
Electrodes
electrodes
Electropolymerization
glassy carbon
Glassy carbon
Tin oxides
Ultraviolet spectroscopy
Electrodeposition
electrodeposition
indium oxides
Indium
Molecular structure
tin oxides
Atomic force microscopy
molecular structure
X ray photoelectron spectroscopy
reactivity
photoelectron spectroscopy
atomic force microscopy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Bélanger, S., Stevenson, K. J., Mudakha, S. A., & Hupp, J. T. (1999). "Perfect" Electrochemical Molecular Sieving by Thin and Ultrathin Metallopolymeric Films. Langmuir, 15(3), 837-843.

"Perfect" Electrochemical Molecular Sieving by Thin and Ultrathin Metallopolymeric Films. / Bélanger, Suzanne; Stevenson, Keith J.; Mudakha, Shikata A.; Hupp, Joseph T.

In: Langmuir, Vol. 15, No. 3, 02.02.1999, p. 837-843.

Research output: Contribution to journalArticle

Bélanger, S, Stevenson, KJ, Mudakha, SA & Hupp, JT 1999, '"Perfect" Electrochemical Molecular Sieving by Thin and Ultrathin Metallopolymeric Films', Langmuir, vol. 15, no. 3, pp. 837-843.
Bélanger, Suzanne ; Stevenson, Keith J. ; Mudakha, Shikata A. ; Hupp, Joseph T. / "Perfect" Electrochemical Molecular Sieving by Thin and Ultrathin Metallopolymeric Films. In: Langmuir. 1999 ; Vol. 15, No. 3. pp. 837-843.
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