Novel synthesis of amorphous CP@HfO2 nanomaterials for high-performance electrochemical sensing of 2-naphthol
Abstract
Abstract
Present research, for the first time, reports a cetylpyridinium (CP)-capped hafnia (HfO
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
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
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
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
2
-NMs
/
Au sensor exhibited a sensitivity of 1.62 µA µM
−1
cm
−2
, a low limit of detection (LOD) of 133.92 nM, and a wide linear dynamic range (LDR) from 2.5 to 100 µM. 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
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
Keywords
- Nanomaterials,
- Sensors,
- CP@HfO2,
- Electrochemical sensing,
- 2-Naphthol,
- Environmental monitoring
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