A Metal-Free, Non-Enzymatic Electrochemical Glucose Sensor with a de-Bundled Single-Walled Carbon Nanotube-Modified Electrode

摘要

A new metal-free, non-enzymatic electrochemical sensor system for the detection of glucose was developed in this study. The developed sensor uses a de-bundled single-walled carbon nanotube (SWCNT)-modified glassy carbon electrode (GCE). SWCNTs were de-bundled in aqueous solution by adding a synthesized polymer dispersant, sulfonated poly(ether sulfone). The de-bundled SWCNTs showed two significant characteristics: (1) improvement of the aspect ratio and dispersibility in aqueous solution and (2) suitability for use as a selective and sensitive sensing element in non-enzymatic glucose sensors. The experimental results clearly demonstrated that the SWCNTs/GCE possesses high electro-catalytic activity and efficient sensitivity with a stable and faster amperometric response production. Furthermore, interference by ascorbic acid, acetaminophen, uric acid, and dopamine is effectively avoided. Therefore, the proposed approach is favorable for the design and development of non-enzymatic glucose sensors.