A non-enzymatic glucose amperometric biosensor based on a simple one-step electrodeposition of Cu microdendrites onto single-walled carbon nanohorn-modified electrode

摘要

We report a novel, highly sensitive, and selective non-enzymatic glucose sensor fabricated by electrodepositing Cu microdendrites onto single-walled carbon nanohorn (SWCNH)-modified glassy carbon electrode. This sensor combined the advantages of SWCNHs and Cu microdendrites and exhibited high electrocatalytic activity toward glucose in 0.2 mol L-1 NaOH alkaline solution. Cyclic voltammetry and amperometric current-time curve were used to investigate the performance of the glucose sensor. We also optimize its preparation and test conditions. At an applied potential of 0.35 V, the oxidation peak current of glucose was good proportional to glucose concentration in the range from 0.04 to 12.6 mmol L-1 with a detection limit of 17 mu mol L-1 (S/N = 3). In addition, the sensor showed long-term stability and good reproducibility and can resist the interference of coexistent species efficiently.