Gold particles modified 3D printed carbon black nanonetwork electrode for improving the detection sensitivity of dopamine

Abstract

Using 3-dimensional (3D) printing to create a fast and accurate electrochemical sensor has attracted the attention of analytical scientists. This study utilized a carbon black/PLA composite filament as the raw material for the construction of 3D electrodes (3DEs). Au particles were modified onto the activated surface of the carbon black nanonetwork 3DE. The physical and chemical properties of the 3DEs were evaluated through scanning electron microscopy (SEM) and X-ray spectroscopy (XPS). Additionally, a range of electrochemical techniques were employed to investigate the electrochemical performance of the 3DEs. The sensor is capable of detecting DA in the concentration range of 0.01–20 μM with the limit of detection (LOD) of 0.084 μM. The approach is also capable of being applied to the actual sample detection of DA with excellent selectivity. Hence, the method of combining noble metal particles and carbon black nanonetwork for constructing 3DE presents novel prospects towards the creation of electrochemical sensors with exceptional sensitivity.