Fabrication of a Novel Electrochemical Sensor Based on Carbon Cloth Matrix Functionalized with MoO3 and 2D-MoS2 Layers for Riboflavin Determination.

Rayhane Zribi,Giovanni Neri,Maria Grazia Donato,Pietro Giuseppe Gucciardi,Antonino Foti

doi:10.3390/s21041371

Rayhane Zribi, Giovanni Neri + Show 3 more

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https://doi.org/10.3390/s21041371

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Abstract

The preparation and characterization of a hybrid composite, based on carbon cloth (CC) matrix functionalized with two-dimensional (2D) MoS2 flakes and MoO3, and its use for developing an electrochemical sensor for the determination of riboflavin (RF) is here reported. The 2D-MoS2-MoO3CC composite was prepared by depositing 2D-MoS2 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-MoO3) by radio-frequency magnetron reactive sputtering technique. The 2D-MoS2-MoO3CC 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-MoS2-MoO3CC composite on the working electrode of a screen-printed carbon electrode (SPCE). The 2D-MoS2-MoO3-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−1 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-MoS2-MoO3-CC/SPCE electrochemical sensor for the determination of riboflavin.

Highlights

Published: 16 February 2021The discovery of graphene has been a revolution in the field of nanomaterials because of its inherent two-dimensionality [1]
We propose an electrochemical sensor for riboflavin (RF) detection using carbon cloth functionalized with MoO3 and decorated with 2D-MoS2 nanosheets
The modified platform was fabricated by layers of MoO3 and 2D-MoS2 nanosheets on the fiber of carbon cloth (CC) network structure

Summary

Introduction

The discovery of graphene has been a revolution in the field of nanomaterials because of its inherent two-dimensionality [1]. This characteristic has given the origin at a very impressive research for using graphene in many devices. Two-dimensional electron confinement of ultra-thin 2D graphene has improved the electrical properties compared to other nanomaterials [2]. Research is focused on other 2D nanomaterials, such as transition metal disulphides (TMDs), due to their amazing properties. They possess sizable band-gaps around 1–2 eV, promising interesting applications in chemical sensors. It has an indirect band-gap of 1.29 eV [3] that turns to semiconductor with a direct band-gap of

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