Noncovalent Functionalization of Single-Walled Carbon Nanotubes with Water-Soluble Porphyrins
- Creators
- Chen, Jinyu
- Collier, C. Patrick
Abstract
We have employed water-soluble porphyrin molecules [meso-(tetrakis-4-sulfonatophenyl) porphine dihydrochloride] 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.
Additional Information
© 2005 American Chemical Society. Received 21 January 2005. Published online 6 April 2005. Published in print 1 April 2005. This work was supported by Arrowhead Research. We thank Yoshie Narui for help with the fluorescence measurements.Additional details
- Eprint ID
- 77961
- Resolver ID
- CaltechAUTHORS:20170606-082255211
- Arrowhead Research
- Created
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2017-06-06Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field