A Flexible, Low-Cost, Disposable Non-Enzymatic Electrochemical Sensor Based on MnO2/Cellulose Nanostructure


 In this investigation, a new class of polysaccharide (cellulose nanowhiskers ) in the presence of manganese oxide nanoparticles (MnO2 NPs) to produce hybrid materials was synthesized and used as a new sensor platform with high and fast electrochemical responses. A simple method of synthesis for producing different cellulosic nanostructures has been evaluated and characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, scanning electron microscope (SEM) ,cyclic voltammogram (CV), and electrochemical impedance spectra (EIS). The FTIR analysis data approved the formation of cellulose and MnO2 nanostructures. The uniform distribution of MnO2 nanostructure over the cellulose nanowhiskers surface has been approved by using SEM. In addition, from CV and EIS characterization MnO2/Cellulose hybrid materials have electrocatalytic properties and promising applications in biosensors and non-enzymatic sensors fields. The MnO2/cellulose non-enzymatic sensor have been used for hydrogen peroxide choronoamperometric detection with high sensitivity 0.70 µA/µM , a linear concentration range from 0.2 - 400 µM, lower limit of detection of 0.04 µM (S/N =3) and R2 of 0.98. The sensor was used for hydrogen peroxide detection in real samples with a high percentage of recovery from 93 to 110%.