Ultrasounds-Assisted Electrosynthesis of Sponge-Like MnO2 Nanostructures: Design a Novel Device for Nanomolar Sensing of Dopamine

چکیده مقاله

In this paper we report direct electrochemical synthesis of sponge-like MnO₂ nanostructures using ultrasonic vibration on the surface of MWCNT modified pencil graphite electrode (PGE). The synthesized nanostructures were characterized by scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDXS) and X-ray fluorescence spectroscopy (XRF). This device was used as a simple and sensitive electrochemical sensor for measurement of Dopamine. The diffusion coefficient (D) and the kinetic parameters such as electron transfer coefficient (α) and ionic exchange current (i_ex) for Dopamine were also determined using electrochemical approaches. The cyclic voltammetry method showed Dopamine oxidation reaction with an irreversible characteristic and was diffusion-controlled at low scan rates. Using differential pulse voltammetry, the peak current was linearly dependent on Dopamine …