Free-standing and Flexible MoS2/rGO Paper Electrode for Amperometric Detection of Folic Acid


Kiransan K. , TOPÇU E.

Electroanalysis, cilt.30, ss.810-818, 2018 (SCI Expanded İndekslerine Giren Dergi) identifier

  • Cilt numarası: 30 Konu: 5
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1002/elan.201700778
  • Dergi Adı: Electroanalysis
  • Sayfa Sayısı: ss.810-818

Özet

The development of flexible electrodes is of considerable current interest because of the increasing demand for modern electronics, portable medical products, and compact devices. We report a new type of flexible electrochemical sensor fabricated by integrating graphene and MoS2 nanosheets. A highly flexible and free-standing conductive MoS2 nanosheets/reduced graphene oxide (MoS2/rGO) paper was prepared by a two-step process: vacuum filtration and chemical reduction treatment. The MoS2/graphene oxide (MoS2/GO) paper obtained by a simple filtration method was transformed into MoS2/rGO paper after a chemical reduction process. The obtained MoS2/rGO paper was characterized by scanning electron microscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, electrochemical impedance spectroscopy. The electrochemical behavior of folic acid (FA) on MoS2/rGO paper electrode was investigated by cyclic voltammetry and amperometry. Electrochemical experiments indicated that flexible MoS2/rGO composite paper electrode exhibited excellent electrocatalytic activity toward the FA, which can be attributed to excellent electrical conductivity and high specific surface area of the MoS2/rGO paper. The resulting biosensor showed highly sensitive amperometric response to FA with a wide linear range.