Screen Printed Carbon Electrodes Modified with 3D Nanostructured Materials for Bioanalysis

Here, the modification of screen-printed carbon electrodes (SPCEs) with 3D nanostructured multi-walled carbon nanotube-sponge (MWCNT-Spng) and graphene foam along with their impact on analytical performance was reported. The bare and modified SPCE electrodes were imaged and characterized using scanning electron microscopy, energy dispersive and electrochemical impedance spectroscopy. The modified electrodes were tested for electrochemical detection of dopamine (DA) and a significant improvement was observed in terms of both limit of detection (LOD) and sensitivity as compared to bare SPCE. MWCNT-Spng-AuNPs/SPCE demonstrated the highest analytical performance for DA. It was also tested for enzyme-free glucose detection, in which case it demonstrated an LOD of 4.96 mu M and a sensitivity of 526 mu A/mM.cm(2), along with a good selectivity for glucose.