An electrochemical sensor for honokiol based on a glassy carbon electrode modified with MoS2/graphene nanohybrid film

Abstract

A novel honokiol electrochemical sensor based on a MoS₂/graphene nanohybrid has been introduced in this work. The hybrid was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical behavior of honokiol on the MoS₂/graphene modified glassy carbon electrode was investigated in a phosphate buffer solution of pH 5.5 by cyclic voltammetry and differential pulse voltammetry. Compared with bare glassy carbon electrode, the proposed electrode showed improved analytical performance characteristics in the catalytic redox of honokiol. Under the optimal conditions, the modified electrode showed a linear voltammetric response to the honokiol in a concentration range from 1.0 × 10⁻⁹ to 2.5 × 10⁻⁶ mol L⁻¹, and the detection limit (S/N = 3) was estimated to be 6.2 × 10⁻¹⁰ mol L⁻¹. Moreover, the sensor also exhibited good reproducibility and stability, and could be used for the detection of honokiol in pharmaceutical samples.