Multiwalled carbon nanotube-based nanosensor for ultrasensitive detection of uric acid, dopamine, and ascorbic acid.

Abstract A novel multiwalled carbon nanotube (MWCNT) based sensor was fabricated as a highly precise and stable electrochemical sensor. The synthesized sensor which consists of ZnNi bimetallic nanoalloy called the ZnNi NPs@f-MWCNT sensor, have been used for the simultaneous detection of uric acid (UA), dopamine (DA) and ascorbic acid (AA). The ZnNi NPs@f-MWCNT sensor obtained based on the microwave irradiation process, and its characterization was performed by using several physical techniques such as XRD, XPS, TEM, Raman, etc. The characterization showed that this sensor has excellent properties such as rich pore channels, excellent structural durability, and large surface area. These properties facilitated mass transfer and electron conductions. It was observed that the obtained sensor gave high electrochemical activity and wide linear responses (0.3–1.1 mM AA, 0.2–1.2 mM DA, 0.2–1.1 mM UA) in the detection of uric acid (UA), dopamine (DA) and ascorbic acid (AA). In addition to these properties, it has been found that the sensor has excellent anti-interferents properties towards AlCl 3 , KCl 3 , glucose, etc. and ZnNi NPs@f-MWCNT sensor was further applied to determine uric acid (UA), dopamine (DA) and ascorbic acid (AA) in real samples. Graphical abstract Unlabelled Image Highlights • An easy and facile synthesis of highly monodisperse novel ZnNi@f-MWCNT nanocomposites • The surface of the f-MWCNT layers appeared effectively and stabilized the metal nanoparticles dimensionally. • Rapid, Sensitive, and Reusable Detection of ascorbic acid, dopamine, uric acid by novel nanocomposites • The excellent electrochemical sensing properties of monodisperse ZnNi@f-MWCNT nanocomposites • Thanks to the ultrasmall sizes, monodispersity and high Zn and Ni % surface of novel materials [ABSTRACT FROM AUTHOR]