Hierarchical Gadolinium Oxide Microspheres for Enzymeless Electro-biosensors in Hydrogen Peroxide Dynamic Detection

A porous gadolinium oxide spherically hierarchical structure (Gd2O3-ms) has been developed by using a hydrothermal method to perform enzymeless dynamic detection of hydrogen peroxide (H2O2), based on its high sensitivity in electrocatalytic reduction of H2O2. X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy have assisted in shedding light on the morphology, material formation process, structure, and properties of the porous gadolinium oxide microspheres. The linear range from 1 to 450M (linear correlation coefficient 0.991), sensitivity of 13.9A mM(-1), and fine detection limit with a prompt current response attaining stable value were achieved by this enzymeless sensor, which was also employed to implement the dynamic tracing of H2O2-releasing processes.