期刊
CHEMICAL PAPERS
卷 69, 期 7, 页码 911-920出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1515/chempap-2015-0099
关键词
electrochemical sensor; graphene oxide; magnetic nanocomposites; nitrite
资金
- National Science Fund of China [21275116]
- Specialized Research Fund for the Doctorol Program of Higher Education [20126101120023]
- Natural Science Foundation of the Shaanxi Province in China [2012JM2013, 2013JM2006]
- Shaanxi Province Educational Committee of China [12JK0576]
- Scientific Research Foundation of the Shaanxi Provincial Key Laboratory [11JS080, 12JS087, 13JS097, 13JS098]
A functional Ag-Fe3O4-grapheme oxide magnetic nanocomposite was synthesized and used to prepare a nitrite sensor. Morphology and composition of the nanocomposites were characterized by a transmission electron microscope, UV-VIS spectroscopy, X-ray diffraction, and Fourier transform infrared spectra. Electrochemical investigation indicated that the nanocomposites possess excellent electrochemical oxidation ability towards nitrites. The sensor exhibited two linear ranges: one from 0.5 mu M to 0.72 mM with a correlation coefficient of 0.996 and sensitivity of 1996 mu A mM(-1) cm(-2); the other from 0.72 mM to 8.15 mM with a correlation coefficient of 0.998 and sensitivity of 426 mu A mM(-1) cm(-2). The limit of detection of this sensing system was 0.17 mu M at the signal-to-noise ratio of 3. Additionally, the sensor exhibited long-term stability, good reproducibility, and anti-interference. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences
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