Fabrication of NiFeB flexible electrode via electroless deposition towards selective and sensitive detection of dopamine

Abstract

A novel cost-effective and eco-friendly flexible electrochemical sensor was designed for highly selective and sensitive detection of dopamine to deal with the problems related to serious neurological disorders. The novel flexible paper electrode with NiFeB synthesised by simple dip-coating exhibits a high sensitivity of 35.35 μA μM⁻¹ cm⁻², 2.36 μA μM⁻¹ cm⁻² and 0.215 μA μM⁻¹ cm⁻² in the linear ranges from 10 nM to 1 μM, 5 μM to 50 μM and 100 μM to 400 μM, respectively, with an ultra-low detection limit of 2.1 nM. Besides, the free-standing flexible electrode for the detection of DA, the flexible paper sensor displayed superior selectivity towards various interferents, such as ascorbic acid, glucose and uric acid, as well as stability under various deformations.