A New pH Sensor Using the Fluorescence Quenching of Carbon Nanotubes

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A new pH sensor based on carbon nanotubes (CNTs), which consist of a fluorescent molecule and a CNT attached to each chain end of a pH sensitive polysulfonamide, respectively, is synthesized, and its pH sensitivity is examined in terms of the fluorescent quenching efficiency of the CNT. The pH sensitive polymeric linker shows an abrupt conformational change between an expanded coil structure and a collapsed globule structure, which results in the drastic on-and-off fluorescent quenching efficiency because of the change in the distance between the fluorophore and CNT. This CNT-based sensor responds to a small change in pH with well-defined on-and-off behavior, and also shows an excellent reversibility against pH change, which explains its feasibility to be widely used in the areas of biological and environmental applications.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2008-11
Language
English
Article Type
Article
Keywords

RESONANCE ENERGY-TRANSFER; INTRACELLULAR PH; NONCOVALENT FUNCTIONALIZATION; GENE DELIVERY; COMPOSITES; BIOSENSORS; TEMPERATURE; NANOPARTICLES; ELEMENTS; DESIGN

Citation

MACROMOLECULAR RAPID COMMUNICATIONS, v.29, no.22, pp.1798 - 1803

ISSN
1022-1336
DOI
10.1002/marc.200800457
URI
http://hdl.handle.net/10203/221046
Appears in Collection
CBE-Journal Papers(저널논문)
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