共 48 条
A New pH Sensor Using the Fluorescence Quenching of Carbon Nanotubes
被引:30
作者:

Cho, Eun Seon
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机构: Seoul Natl Univ, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea

Hong, Sung Woo
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h-index: 0
机构: Seoul Natl Univ, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea

Jo, Won Ho
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机构:
Seoul Natl Univ, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea Seoul Natl Univ, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea
机构:
[1] Seoul Natl Univ, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea
关键词:
carbon nanotubes;
fluorescence;
pH;
quenching;
sensors;
D O I:
10.1002/marc.200800457
中图分类号:
O63 [高分子化学(高聚物)];
学科分类号:
070305 ;
080501 ;
081704 ;
摘要:
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.
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页码:1798 / 1803
页数:6
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