A Flexible, Low-Cost, Disposable Non-Enzymatic Electrochemical Sensor Based on MnO <sub>2</sub> /Cellulose Nanostructure
Hebat‐Allah S. Tohamy, Hend S. Magar
Abstract
In this investigation, a new class of polysaccharide (cellulose nanowhiskers ) in the presence of manganese oxide nanoparticles (MnO 2 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 (XRD), scanning electron microscope (SEM),cyclic voltammogram (CV) and electrochemical impedance spectra (EIS). The FTIR analysis data approved the formation of cellulose and MnO 2 nanostructures. The uniform distribution of MnO 2 nanostructure over the cellulose nanowhiskers surface has been approved by using SEM. In addition, From CV and EIS characterization MnO 2 /Cellulose hybrid materials have electrocatalytic properties and promising applications in biosensors and non-enzymatic sensors fields. The MnO 2 /cellulose non-enzymatic sensor have been used for hydrogen peroxide choronoamperometric detection with high sensitivity 0.70 μ A μ M −1 , a linear concentration range from 0.2 − 400 μ M, lower of detection limit (LOD) of 0.04 μ M (S/N = 3) and R 2 of 0.98. The sensor was used for hydrogen peroxide detection in real samples with a high percentage of recovery from 93 to 110 %.