Synthesis of Micro-dumbbell Shaped rGO/ZnO Composite Rods and Its Application Towards as Electrochemical Sensor for the Simultaneous Determination of Ammonia and Formaldehyde Using Hexamine and Its Structural Analysis
| Autor: | G. Padmalaya, B. S. Sreeja, Sujan Shrestha, S. Radha, M. Arivanandan, S. Shoba, R. Rajavel |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Materials science Polymers and Plastics Scanning electron microscope Composite number Formaldehyde 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Electrochemical gas sensor Crystallinity chemistry.chemical_compound chemistry Materials Chemistry Cyclic voltammetry 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Inorganic and Organometallic Polymers and Materials. 30:943-954 |
| ISSN: | 1574-1451 1574-1443 |
| Popis: | The author describes a voltammetric sensor for the simultaneous determination of formaldehyde and ammonia using rGO/ZnO composite micro-dumbbell shaped rods. A facile hydrothermal technique was adopted to synthesize rGO/ZnO composite based micro-dumbbell shaped rods. The potential application based on obtained product has been employed as electrochemical sensor towards the detection of ammonia and formaldehyde using hexamine. For performing an electrochemical sensing application, glassy carbon electrode was modified with rGO/ZnO composite rods and analysed for the formation of multiple peaks thus emphasizing the detection of formaldehyde and ammonia using hexamine. Hexamine is toxic food preservative when it dissolutes in saline medium containing pH 7.4 emits ammonia and formaldehyde. The crystallinity property has been examined using X-ray diffraction technique revealing composite rods (rGO/ZnO) with 29.5 nm were lesser than ZnO NPs (38.33 nm). The surface morphology was investigated by scanning electron microscopy (SEM). In order to examine limit of detection (LOD) and sensitivity, cyclic voltammetry was carried out to determine the formaldehyde and ammonia. The voltammetric results revealed three different redox peaks with increased hexamine concentrations in which 0.4 V for formaldehyde, 0.13 V for ammonia and ~ 0.3 V for Zn2+ ions. The calibrated curve for ammonia with LOD and LOQ was found to be 0.1 µM and 0.9 µM and for formaldehyde with 0.023 µM and 0.07 µM respectively. Based on investigated results, the modified electrode was applied to the determination of ammonia and formaldehyde in urine samples (real-time analysis) and the results proved that the method is sensitive and can be an alternative to chromatographic and spectroscopic techniques. |
| Databáze: | OpenAIRE |
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