Preparation and characterization of PANI@G/CWO nanocomposite for enhanced 2-nitrophenol sensing
Abstract A new material by polymer insertion via graphene oxide into cerium tungstate was prepared by very simple oxidation-reduction method. Aniline polymerization was done on the surface of graphene oxide (GO) which was reduced to graphene (G) simultaneously mixed with separately prepared inorganic matrices of cerium tungstate (Ce 2 (WO 4 ) 3 (CWO)). PANI@G/CWO was characterized by various spectroscopic methods as SEM, FTIR, TGA, XRD and XPS to confirm its possibilities. Selective 2-nitrophenol sensor was fabricated on flat glassy carbon electrode (GCE) and PANI@G/CWO nanocomposites in the form of thin layer. It was found excellent sensitivity as well as long life spam with broad dynamic concentration range (LDR) that showed efficient electrochemical performance towards 2-nitrophenol on fabricated chemical sensor by PANI@G/CWO. The linear calibration curve (r 2 = 0.9914) with wide range of 2-nitrophenol concentration (1.0nM–1.0mM) was found having the detection limit of 0.87nM while the sensitivity of the sensor was around 1.229μAμM −1 cm −2 . It was introduced a new route for the development of a versatile phenolic sensor based on PANI@G/CWO nanocomposites by I–V method that is proved more selective and sensitive for environmental toxic materials. Highlights PANI@G/CWO nanocomposite was synthesized by simple sol-gel method. PANI@G/CWO advances for layered materials with higher electrochemical performance so they chosen for the purpose. PANI@G/CWO was used as selective 2-nitrophenol sensor, fabricated on flat glassy carbon electrode (GCE). Phenolic sensor development based on PANI@G/CWO nanocomposite offers a cost effective materials. PANI@G/CWO nanocomposite is a viable alternative for detecting and removing toxic phenolic compounds from wastewater samples. Graphical abstract Schematic diagram showing the preparation of PANI@G/CWO nanocomposite. [DISPLAY OMISSION]
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