• 文献标题:   A sensitive nitrite sensor using an electrode consisting of reduced graphene oxide functionalized with ferrocene
  • 文献类型:   Article
  • 作  者:   RABTI A, BEN AOUN S, RAOUAFI N
  • 作者关键词:   electroanalysi, nitrite sensor, functionalized reduced graphene oxide, ferrocene, amperometric detection
  • 出版物名称:   MICROCHIMICA ACTA
  • ISSN:   0026-3672 EI 1436-5073
  • 通讯作者地址:   Univ Tunis El Manar
  • 被引频次:   7
  • DOI:   10.1007/s00604-016-1959-4
  • 出版年:   2016

▎ 摘  要

A composite consisting of chitosan containing azidomethylferrocene covalently immobilized on sheets of reduced graphene oxide was drop-casted on a polyester support to form a screen-printed working electrode that is shown to enable the determination of nitrite by cyclic voltammetry and chronoamperometry. Both reduction and oxidation of nitrite can be accomplished due to the high electron-transfer rate of this electrode. Under optimal experimental conditions (i.e. an applied potential of 0.7 V vs. Ag/AgCl in pH 7.0 solution), the calibration plot is linear in the 2.5 to 1450 mu M concentration range, with an similar to 0.35 mu M limit of detection (at a signal-to-noise ratio of 3). The sensor was successfully applied to the determination of nitrite in spiked mineral water samples, with recoveries ranging between 95 and 101 %.