Fabrication of a Novel Electrochemical Sensor Based on Carbon Cloth Matrix Functionalized with MoO 3 and 2D-MoS 2 Layers for Riboflavin Determination

• Published in: Sensors (Basel, Switzerland) Vol. 21; no. 4
• Main Authors: Zribi, Rayhane, Foti, Antonino, Donato, Maria Grazia, Gucciardi, Pietro Giuseppe, Neri, Giovanni
• Format: Journal Article
• Language: English
• Published: Switzerland 16.02.2021
• Subjects: molybdenum disulphide nanosheets; electrochemical sensors; molybdenum oxide; riboflavine sensing
• ISSN: 1424-8220

The preparation and characterization of a hybrid composite, based on carbon cloth (CC) matrix functionalized with two-dimensional (2D) MoS flakes and MoO , and its use for developing an electrochemical sensor for the determination of riboflavin (RF) is here reported. The 2D-MoS -MoO CC composite was prepared by depositing 2D-MoS nanosheets, obtained by liquid phase exfoliation (LPE), on the surface of a carbon cloth fiber network, previously functionalized with a layer of molybdenum oxide (α-MoO ) by radio-frequency magnetron reactive sputtering technique. The 2D-MoS -MoO CC composite was characterized by scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDX), and Raman spectroscopy. An electrochemical sensor has been then fabricated by fixing a slice of the 2D-MoS -MoO CC composite on the working electrode of a screen-printed carbon electrode (SPCE). The 2D-MoS -MoO -CC/SPCE sensor display good electrochemical characteristics which have been exploited, for the first time, in the electroanalytical determination of riboflavin (RF). The sensitivity to RF, equal to 0.67 µA mM in the linear range from 2 to 40 µM, and a limit of detection (LOD) of 1.5 µM at S/N = 3, demonstrate the promising characteristics of the proposed 2D-MoS -MoO -CC/SPCE electrochemical sensor for the determination of riboflavin.