Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Abstract

In this report, hierarchical cobalt hydroxide [Co(OH) 2 ] hollow spheres composed of nanosheets were synthesized by fast etching of polycrystalline cuprous oxide and were then applied for the nonenzymatic electrochemical detection of glucose. The fabricated hierarchical Co(OH) 2 nanosheet hollow spheres were characterized by X‐ray photoelectron spectroscopy, X‐ray diffraction, field‐emission scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction. The electrochemical performance of the hierarchical Co(OH) 2 nanosheet hollow spheres modified electrode to detect glucose was investigated by cyclic voltammetry. These sensors exhibited excellent electrocatalytic activity toward glucose, with a response time of less than 5 s. The calibration plot is linear over the wide concentration range of 1 µ m to 0.13 m m , with a high sensitivity of 925.21 µA m m –1 cm –2 , a correlation coefficient of 0.9942, and a detection limit of 0.93 µ m (signal to noise: 3). The results demonstrate that hierarchical Co(OH) 2 nanosheet hollow spheres play a vital role in the development of electrochemical sensors for nonenzymatic glucose detection.