Cadmium hexacyanidoferrate(III) nanocubes (CdFeNc) have been synthesized and characterized using elemental analysis, thermal analysis, infrared spectroscopy, and X-ray diffraction technique. FE-SEM image showed that nanoparticles have cubic shape with size range 60–90 nm. Electrochemical behavior of CdFeNc has been studied. Electrocatalytic oxidation of morphine was studied using a cadmium hexacyanidoferrate(III) nanocube–carbon nanotube composite modified glassy carbon electrode (CdFeNc–CNT/GCE). The modified electrode reduced the peak potential of morphine by nearly 95 mV. The CdFeNc–CNT/GCE showed a linear response in a concentration range of 500–20 µM. The correlation coefficients (R) for phenolic and t-amine groups of morphine were 0.9925 and 0.9996 respectively while their sensitivity was 3.363 and 4.154 µA µM−1. The CdFeNc–CNT/GCE exhibited a detection limit of 0.21 µM for phenolic and t-amine groups of morphine.
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