Tungsten sulphide decorated carbon nanotube based electroanalytical sensing of neurotransmitter dopamine

Here, a tungsten sulphide-decorated multi-walled carbon nanotube (WS2/MW-CNT) modified GCE was fabricated to enable electroanalytical detection of dopamine. The prepared nanomaterial was characterized using FE-SEM, EDS, HR-TEM, XRD, and FTIR techniques. The electrochemical performance of the prepared WS2/MW-CNT towards detecting the neurotransmitter dopamine was achieved using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The CV analysis showed that the prepared heterostructure nanomaterial significantly enhances electrocatalytic activity, thereby enhancing the sensing performance. The WS2/MW-CNT modified GCE exhibited a 345 % increase in oxidative peak current value compared to the bare GCE electrode. The DPV technique-based sensing results showed linearity in a concentration range of 1 mu M to 22 mu M with a LOD of 0.55 mu M. The prepared sensing platform demonstrated remarkable selectivity in the presence of interferent substances such as epinephrine and ascorbic acid. Furthermore, WS2/MW-CNT/GCE provided acceptable results during the stability study.