title: Functionalization of carbon nanotubes with a pH-responsive molecule to produce a pH sensor.
abstract: 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.
authors.affiliation: Nano Functionality Integration Group, National Institute for Materials Science, Tsukuba 305-0044, Japan. zhao.liping@nims.go.jp
authors.forename: Liping
authors.initials: L
authors.lastname: Zhao
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Nakayama
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tomimoto
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Shingaya
authors.forename: Qing
authors.initials: Q
authors.lastname: Huang
mesh_terms: D056246:Chemistry, Analytic; D004396:Coloring Agents / Q000737:chemistry*; D004583:Electrons; D004952:Esters / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008163:Luminescent Measurements; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D055620:Optical Phenomena; D011721:Pyrenes / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013451:Sulfonic Acids / Q000737:chemistry*
chemical_list: C545559:6,8-dihydroxy-1,3-pyrenedisulfonic acid; D004396:Coloring Agents; D004952:Esters; D037742:Nanotubes, Carbon; D011721:Pyrenes; D013451:Sulfonic Acids