One-step solvent exfoliation of graphite to produce a highly-sensitive electrochemical sensor for tartrazine
| Autor: | Xiaohong Tan, Guishen Liu, Zhen Shi, Shenghui Zhang, Kangbing Wu, Xinjian Song |
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| Rok vydání: | 2014 |
| Předmět: |
Detection limit
Materials science Inorganic chemistry Metals and Alloys Condensed Matter Physics Electrochemistry Exfoliation joint Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrochemical gas sensor Solvent chemistry.chemical_compound Linear range chemistry Materials Chemistry Graphite Electrical and Electronic Engineering Instrumentation Tartrazine Nuclear chemistry |
| Zdroj: | Sensors and Actuators B: Chemical. 197:104-108 |
| ISSN: | 0925-4005 |
| Popis: | Exfoliated graphite was facilely prepared through one-step liquid exfoliation of graphite powder in N-methyl-2-pyrrolidone. The resulting exfoliated graphite was redispersed into N,N-dimethylformamide, and then used to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. The electrochemical behaviors of tartrazine were studied, and a sensitive oxidation peak was observed. Interestingly, the oxidation peak current of tartrazine was greatly improved on the surface of exfoliated graphite-modified GCE. The considerable peak current enlargement indicates that the exfoliated graphite exhibits remarkable signal enhancement effects toward tartrazine oxidation. The influences of pH value, amount of exfoliated graphite, accumulation potential and time were examined on the oxidation signal of tartrazine. As a result, a sensitive and rapid electrochemical method was developed for the detection of tartrazine. The linear range was from 5 μg/L to 0.2 mg L−1, and the detection limit was 1.5 μg/L (2.8 nM). This new sensor was used in soft drink samples, and the detected results consisted with the values that obtained by high-performance liquid chromatography. |
| Databáze: | OpenAIRE |
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