Electrochemical detection of methyl parathion using zirconium dioxide@single-walled carbon nanotubes nanocomposite modified glassy carbon electrode
Meimei Guo, Jiale Han, Yurii Mishchenko, Andrii Butenko, V. D. Kovalenko, Tetiana Rozhkova, Hongyuan Zhao
Abstract
In this work, the multifunctional nanocomposite of zirconium dioxide (ZrO2) nanoparticles and single-walled carbon nanotubes (SCN) was prepared to modify the glassy carbon electrode (GCE) for the fabrication of ZrO2@SCN/GCE sensor. The fabricated nanocomposite electrochemical sensor was successfully used to achieve the efficient and sensitive detection of methyl parathion (MP). For the ZrO2@SCN nanocomposite, ZrO2 nanoparticles could promote the enrichment of MP molecules on the electrode surface of ZrO2@SCN/GCE sensor because of the interplay between Zr-O groups and phosphorus groups of MP molecules; SCN presented efficient one-dimensional charge transport channels, which achieved the excellent conductivity property of carbon material. Moreover, SCN could greatly compensate for the non-conductivity of ZrO2 nanoparticles. The functional combination of ZrO2 nanoparticles and SCN enhanced the electrochemical detection performance of MP. The ZrO2@SCN/GCE sensor exhibited good MP detection property with low limit of detection of 6.15 nM (pH=7.0, MP concentration: 0.01-10 μM). The fabricated sensor also showed good practical application property for the detection of MP in real samples (Lake water and green tea).