| Affiliation: | 1. Institute of BioPhysio Sensor Technology (IBST), Pusan National University, Busan, 46241 Republic of Korea Department of Chemistry, Pusan National University, Busan, 46241 South Korea;2. Department of Chemistry, Pusan National University, Busan, 46241 South Korea;3. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, 46241 South Korea;4. Institute of BioPhysio Sensor Technology (IBST), Pusan National University, Busan, 46241 Republic of Korea |
| Abstract: | The performance enhancement of 3D-printed electrode comprised of polylactic acid (PLA) and graphite (Gr) doped with graphene oxide (GO) was studied to detect five heavy metal ions in trace level. The pretreatment of PLA/Gr/GO electrode with potential cycling in H2SO4 solution achieved the most sensitive response. The characteristics of the composite electrodes were verified using XPS, FE-SEM, EDXS, Raman, and impedance spectroscopy. The experimental variables affecting the response current were optimized with respect to pH, deposition time, ratio of PLA/Gr/GO, and supporting electrolytes. The pretreated 3D-PLA/Gr/GO electrode showed a wide dynamic range from 0.5 ppb to 1.0 ppm with low detection limits of 0.039–0.13 ppb. The reliability of the PLA/Gr/GO electrode was evaluated by analyzing the reference samples of European Reference Materials. |
