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A Prussian Blue (PB) zinc oxide (ZnO) nanoparticle carboxylic acid-functionalized multiwalled carbon nanotube (PB/ZnO/COOH-MWNT) composite was fabricated for the determination of dopamine (DA). ZnO nanoparticles were tethered to COOH-MWNTs using sonication. Upon attachment of the PB to the ZnO/COOH-MWNTs, which consisted of ZnO nanoparticles 13 nm in diameter, the ZnO coalesced to larger clusters with an average diameter of 573 ± 4 nm. The current response versus various concentrations of DA was measured using chronoamperometry. The optimum conditions for DA measurements were at pH 7.0 using the oxidation current. The sensor has a linear dynamic range from 10 to 900 μM with a limit of detection of 0.37 8  ± 0.01 5  μM, suitable for practical neuroblastoma screening at the lower concentration range and process controls for polydopamine synthesis at the upper concentration range, important for modifying polymeric membranes for water purification.

Electrochemical Detection of Dopamine Using a Prussian Blue Carbon Nanotube Composite Decorated with Agglomerated ZnO Particles