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Functionalization of carbon nanotubes with a pH-responsive molecule to produce a pH sensor

2009; IOP Publishing; Volume: 20; Issue: 32 Linguagem: Inglês

10.1088/0957-4484/20/32/325501

1361-6528

Liping Zhao, Tomonobu Nakayama, Hiroyuki Tomimoto, Yoshitaka Shingaya, Qing Huang,

Electrochemical sensors and biosensors

Carbon nanotubes were functionalized with the ratiometric pH-responsive dye molecule 6,8-dihydroxy-1,3-pyrenedisulfonic acid disodium salt, which enabled them to indicate pH values over the range of pH 5.6–8.3. The nanotubes were coated with a layer of electron-donating ZnPc, which strengthened the CNT–dye interaction. The range of pH response is relevant for biological systems, which makes the nanotubes suitable for a wide range of applications within nanobiotechnology.