Noncovalent porphyrin-functionalized single-walled carbon nanotubes

Solubilization and spectral behaviors

Hiroto Murakami, Genki Nakamura, Takuro Nomura, Takeshi Miyamoto, Naotoshi Nakashima

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We describe the solubilization/dispersion of as-produced and purified single-walled carbon nanotubes (raw-SWNTs and p-SWNTs) with protoporphyrin IX derivatives and tetraphenylporphyrin iron(III) chloride, the spectral behavior of the octaalkylporphyrins-solubilized shortened-SWNTs (s-SWNTs), and the electrochemistry of a p-SWNTs/FePP cast film on a glassy carbon electrode. Transmission electron and atomic force microscopies, as well as UV-visible-near IR spectroscopy, revealed that the protoporphyrin IX derivatives individually dissolved the p-SWNTs in polar solvents under mild conditions of sonication using a bath-type sonicator, followed by centrifugation at 1000 g. The raw-SWNTs were more easily dissolved than the p-SWNTs with protoporphyrin IX zinc(II) (ZnPP), whereas the amount of the solubilized/dispersed p-SWNTs did not depend on the concentration of the solubilizer and sonication time. The absorption and fluorescence spectral measurements of the octaalkylporphyrins in dimethylformamide containing 1 vol% tetrahydrofuran with various amounts of the s-SWNTs showed that the absorption maxima of the octaalkylporphyrins decreased with an increase in the concentration of the s-SWNTs without wavelength shift and the fluorescence of the porphyrins was quenched by the addition of the s-SWNTs. These spectral behaviors are direct evidence for the interaction between the nanotube sidewall and the porphyrins in the solutions. The cyclic voltammograms of the p-SWNTs/hemin (FePP) and free hemin (FePP) suggest that the nanotubes act as a conduction passage for electrons between hemin (FePP) and the glassy carbon electrode.

Original languageEnglish
Pages (from-to)418-427
Number of pages10
JournalJournal of Porphyrins and Phthalocyanines
Volume11
Issue number5-6
Publication statusPublished - Jan 1 2007

Fingerprint

Hemin
Porphyrins
Single-walled carbon nanotubes (SWCN)
Sonication
Glassy carbon
Nanotubes
Fluorescence
Derivatives
Dimethylformamide
Electrodes
Centrifugation
Electrons
Electrochemistry
Chlorides
Infrared spectroscopy
Atomic force microscopy
Wavelength
protoporphyrin IX

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Murakami, H., Nakamura, G., Nomura, T., Miyamoto, T., & Nakashima, N. (2007). Noncovalent porphyrin-functionalized single-walled carbon nanotubes: Solubilization and spectral behaviors. Journal of Porphyrins and Phthalocyanines, 11(5-6), 418-427.

Noncovalent porphyrin-functionalized single-walled carbon nanotubes : Solubilization and spectral behaviors. / Murakami, Hiroto; Nakamura, Genki; Nomura, Takuro; Miyamoto, Takeshi; Nakashima, Naotoshi.

In: Journal of Porphyrins and Phthalocyanines, Vol. 11, No. 5-6, 01.01.2007, p. 418-427.

Research output: Contribution to journalArticle

Murakami, H, Nakamura, G, Nomura, T, Miyamoto, T & Nakashima, N 2007, 'Noncovalent porphyrin-functionalized single-walled carbon nanotubes: Solubilization and spectral behaviors', Journal of Porphyrins and Phthalocyanines, vol. 11, no. 5-6, pp. 418-427.
Murakami, Hiroto ; Nakamura, Genki ; Nomura, Takuro ; Miyamoto, Takeshi ; Nakashima, Naotoshi. / Noncovalent porphyrin-functionalized single-walled carbon nanotubes : Solubilization and spectral behaviors. In: Journal of Porphyrins and Phthalocyanines. 2007 ; Vol. 11, No. 5-6. pp. 418-427.
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