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Free‐standing and Flexible MoS 2 /rGO Paper Electrode for Amperometric Detection of Folic Acid
Author(s) -
Kıranşan Kader Dağcı,
Topçu Ezgi
Publication year - 2018
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201700778
Subject(s) - graphene , dielectric spectroscopy , amperometry , materials science , cyclic voltammetry , electrode , raman spectroscopy , x ray photoelectron spectroscopy , electrochemistry , oxide , chemical engineering , nanotechnology , analytical chemistry (journal) , inorganic chemistry , chemistry , organic chemistry , physics , engineering , optics , metallurgy
Abstract 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 MoS 2 nanosheets. A highly flexible and free‐standing conductive MoS 2 nanosheets/reduced graphene oxide (MoS 2 /rGO) paper was prepared by a two‐step process: vacuum filtration and chemical reduction treatment. The MoS 2 /graphene oxide (MoS 2 /GO) paper obtained by a simple filtration method was transformed into MoS 2 /rGO paper after a chemical reduction process. The obtained MoS 2 /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 MoS 2 /rGO paper electrode was investigated by cyclic voltammetry and amperometry. Electrochemical experiments indicated that flexible MoS 2 /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 MoS 2 /rGO paper. The resulting biosensor showed highly sensitive amperometric response to FA with a wide linear range.