Noncovalent functionalization of single-walled carbon nanotubes with water-soluble porphyrins

Jinyu Chen; C. Patrick Collier

doi:10.1021/jp050389i

Noncovalent functionalization of single-walled carbon nanotubes with water-soluble porphyrins

Jinyu Chen, C. Patrick Collier

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

188 Scopus citations

Abstract

We have employed water-soluble porphyrin molecules [meso-(tetrakis-4- sulfonatophenyl) porphine dihydro-chloride] to solubilize single-walled carbon nanotubes (SWNTs), resulting in aqueous solutions that are stable for several weeks. The porphyrin-nanotube complexes have been characterized with absorption and fluorescence spectroscopy and with AFM. We find that the porphyrin/SWNT interaction is selective for the free base form, and that this interaction stabilizes the free base against protonation to the diacid. Under mildly acidic conditions nanotube-mediated J-aggregates form, which are unstable in solution and result in precipitation of the nanotubes over the course of a few days. Porphyrin-coated SWNTs can be precisely aligned on hydrophilic poly(dimethylsiloxane) (PDMS) surfaces by combing SWNT solution along a desired direction and then transferred to silicon substrates by stamping. Parallel SWNT patterns have been fabricated in this manner.

Original language	English
Pages (from-to)	7605-7609
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	109
Issue number	16
DOIs	https://doi.org/10.1021/jp050389i
State	Published - Apr 28 2005
Externally published	Yes

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title = "Noncovalent functionalization of single-walled carbon nanotubes with water-soluble porphyrins",

abstract = "We have employed water-soluble porphyrin molecules [meso-(tetrakis-4- sulfonatophenyl) porphine dihydro-chloride] to solubilize single-walled carbon nanotubes (SWNTs), resulting in aqueous solutions that are stable for several weeks. The porphyrin-nanotube complexes have been characterized with absorption and fluorescence spectroscopy and with AFM. We find that the porphyrin/SWNT interaction is selective for the free base form, and that this interaction stabilizes the free base against protonation to the diacid. Under mildly acidic conditions nanotube-mediated J-aggregates form, which are unstable in solution and result in precipitation of the nanotubes over the course of a few days. Porphyrin-coated SWNTs can be precisely aligned on hydrophilic poly(dimethylsiloxane) (PDMS) surfaces by combing SWNT solution along a desired direction and then transferred to silicon substrates by stamping. Parallel SWNT patterns have been fabricated in this manner.",

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AU - Collier, C. Patrick

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N2 - We have employed water-soluble porphyrin molecules [meso-(tetrakis-4- sulfonatophenyl) porphine dihydro-chloride] to solubilize single-walled carbon nanotubes (SWNTs), resulting in aqueous solutions that are stable for several weeks. The porphyrin-nanotube complexes have been characterized with absorption and fluorescence spectroscopy and with AFM. We find that the porphyrin/SWNT interaction is selective for the free base form, and that this interaction stabilizes the free base against protonation to the diacid. Under mildly acidic conditions nanotube-mediated J-aggregates form, which are unstable in solution and result in precipitation of the nanotubes over the course of a few days. Porphyrin-coated SWNTs can be precisely aligned on hydrophilic poly(dimethylsiloxane) (PDMS) surfaces by combing SWNT solution along a desired direction and then transferred to silicon substrates by stamping. Parallel SWNT patterns have been fabricated in this manner.

AB - We have employed water-soluble porphyrin molecules [meso-(tetrakis-4- sulfonatophenyl) porphine dihydro-chloride] to solubilize single-walled carbon nanotubes (SWNTs), resulting in aqueous solutions that are stable for several weeks. The porphyrin-nanotube complexes have been characterized with absorption and fluorescence spectroscopy and with AFM. We find that the porphyrin/SWNT interaction is selective for the free base form, and that this interaction stabilizes the free base against protonation to the diacid. Under mildly acidic conditions nanotube-mediated J-aggregates form, which are unstable in solution and result in precipitation of the nanotubes over the course of a few days. Porphyrin-coated SWNTs can be precisely aligned on hydrophilic poly(dimethylsiloxane) (PDMS) surfaces by combing SWNT solution along a desired direction and then transferred to silicon substrates by stamping. Parallel SWNT patterns have been fabricated in this manner.

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Noncovalent functionalization of single-walled carbon nanotubes with water-soluble porphyrins

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