부산대학교 도서관

Present research, for the first time, reports a cetylpyridinium (CP)-capped hafnia (HfO.sub.2)-based novel nanomaterials (NMs) for efficient electrochemical sensing of 2-naphthol (2-NPT)-a noxious, mutagenic, and carcinogenic pollutant. A facile two-step hydrothermal approach was optimized to synthesise amorphous nanospheres of CP@HfO.sub.2 NMs (18-25 nm). The results of spectroscopic and electrochemical studies confirmed the availability of electron-rich and surface-active sites in CP@HfO.sub.2 NMs, which provided better chelating centres improving the stability of NMs and allowing selective detection of 2-NPT. For the sensing application, a CP@HfO.sub.2 NMs film was grown onto a gold (Au) electrode and electrochemical sensing was performed as a function of varied 2-NPT concentration using differential pulse voltammetry (DPV). Due to facile electron transport, the CP@HfO.sub.2-NMs/Au sensor exhibited a sensitivity of 1.62 [micro]A [micro]M.sup.-1 cm.sup.-2, a low limit of detection (LOD) of 133.92 nM, and a wide linear dynamic range (LDR) from 2.5 to 100 [micro]M. The interference study evinced good selectivity and the propounded approach was successfully practiced for the detection of 2-NPT in environmental water samples. The outcomes of this research suggest that the CP@HfO.sub.2-NMs/Au system is an effective analytical tool for selective 2-NPT detection, which is essential for environmental monitoring and quality assurance. Graphical abstract
Author(s): Mehar Singh [sup.1], Moondeep Chauhan [sup.2], Yogendra K. Mishra [sup.3], Scott L. Wallen [sup.4], Gurpreet Kaur [sup.1], Ajeet Kaushik [sup.4], Ganga Ram Chaudhary [sup.1] [sup.5] Author Affiliations: (1) grid.261674.0, [...]