Flexible non-enzymatic glucose biosensor based on CoNi2S4 nanosheets grown on nitrogen-doped carbon foam substrate

A flexible non-enzymatic glucose sensing material which consists of the CoNi2S4 nanosheets grown on the reticular Nitrogen-doped Carbon Foam substrate (CoNi2S4@NCF) has been successfully fabricated by a simple two-step synthesis process. The micromorphology, composition and valence of the CoNi2S4@NCF are researched by means of FESEM, TEM, XPS and XRD. Subsequently, the glucose sensing characteristics of the CoNi2S4@NCF are studied by Cyclic Voltammetry and Amperometry, and the detection performance of CoNi2S4@NCF synthesized by different processes is compared. Through a series of tests, it is found that when the volume ratio of deionized water to anhydrous ethanol is 30 ml: 30 ml, the prepared CoNi2S4@NCF has excellent glucose sensing properties. The sensitivity is 6.675 mu A mM(-1) cm(-2) and 54.82 mu A mM(-1) cm(-2) over the linear detection range of 0.5-12.5 mM and 12.5-30 mM, respectively. At the same time, the CoNi2S4@NCF has outstanding anti-interference, stability, repeatability and shows good performance in the detection of actual samples. In addition, the synthesized CoNi2S4@NCF has good flexibility and compres-sibility. Compared with general sensing materials, this flexible material is more conducive to storage and use. It provides a new idea for wearable instruments. All these fully indicate that the fabricated CoNi2S4@ NCF have a good prospect in the field of non-enzymatic glucose sensing. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A flexible non-enzymatic glucose sensing material CoNi2S4@NCF has been successfully fabricated with excellent sensing properties, anti-interference, stability, and repeatability. This material also exhibits good flexibility and compressibility, making it more convenient for storage and use, providing a new idea for wearable instruments.