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

被引：158
作者：
Chen, JY [1 ]
Collier, CP [1 ]
机构：
[1] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 16期
关键词：
D O I：
10.1021/jp050389i
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
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收藏
页码：7605 / 7609
页数：5
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