High electrochemical response of TiO2@C-dots nanocomposites as electrode modifiers for Pb (II) detection. (15th June 2023)

• Record Type: Journal Article
• Authors: Arham, Zul; Kurniawan, Kurniawan; Anhusadar, Laode
• Is Part Of: Materials science in semiconductor processing. Volume 160(2023)
• Publication Date: 2023-06-15
• Subjects: Nanomaterial -- CPE -- TiO2@C-dots -- Pb (II) -- Voltammetry; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2023.107466
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: The synthesis of new modifiers based on nanomaterials as Pb (II) sensing electrode composites has attracted much attention in recent years. Modifiers are believed to produce stable electrodes with good sensitivity. In this study, we synthesized TiO2 -incorporated carbon dots (TiO2 @C-dots) and tested their performance as modifiers in the detection of Pb (II) using a carbon paste electrode (CPE). The fabrication of TiO2 @C-dots-decorated CPE (CPE/TiO2 @C-dots) has been carried out using several methods including electrochemical, hydrothermal impregnation, and mechanical homogenization at low temperatures. Based on the results of SEM, XRD, and FTIR characterization, the morphology of the nanocomposites is known to consist of uniform solid particles. Also, there are voids on the nanocomposite surface. The nanocomposite has an average particle size of 22.61 nm and a specific 2θ angle of 26.33°. The nanocomposites actively absorb IR at specific wavenumbers of 3600 cm −1 (-OH stretch) and 1759 cm −1 (CO stretch). Performance test results for Pb (II) detection showed that decorative modifiers (TiO2 @C-dots) and CPE affected the peak redox current of Pb (II). This effect correlates with the mass of TiO2 @C-dots, with a mass of 10.0 mg being the best mass for TiO2 @C-dots. During the detection process, Pb (II) underwent redox reactions with oxidation (Epa) and reduction (Epc) potential values of −0.38 V and −0.50 V, respectively. During application, it is controlled by the interaction diffusivity with the Pb (II) molecule, yielding an accuracy of 0.36%.