|Title:||Amperometric sensing of nitrite at nanomolar concentrations by using carboxylated multiwalled carbon nanotubes modified with titanium nitride nanoparticles||Authors:||Annalakshmi, Muthaiah
Chen, Shen Ming
Chen, Tse Wei
|Keywords:||Electrochemical sensor | Heterogeneous electron transfer rate | Inorganic pollutants | Low impedance | Methemoglobinemia||Issue Date:||1-Jan-2019||Journal Volume:||186||Journal Issue:||1||Source:||Microchimica Acta||Abstract:||
© 2018, Springer-Verlag GmbH Austria, part of Springer Nature. A glassy carbon electrode (GCE) was modified with a nanocomposite prepared from carboxylated multiwalled carbon nanotubes (c-MWCNT) and titanium nitride (TiN) nanoparticles to obtain a sensor for nitrite. The nanocomposite was characterized by transmission electron microscopy, elemental mapping, X-ray diffraction, and Raman spectroscopy. Electrochemical studies results show the modified GCE to possess a low electrochemical resistance (Rct = 7 Ω) and a large electroactive surface (A = 0.112 cm 2 ). The heterogeneous electron transfer rate (k s ) is found to be 1.26 × 10 −2 cm s −1 . Due to the excellent synergistic effect of c-MWCNT and TiN, the GCE displays and excellent performance in terms of nitrite sensing. At a typical working voltage of +0.8 V (vs. Ag/AgCl), the limit of detection (LOD) is as low as 4 nM, and the useful analytical range extends from 6 nM to 950 μM. This is much better than the LODs of previously reported nitrite sensors. The sensor is fast (response time 4 s), selective, and long-term stable. It was applied to the determination of nitrite in spiked water and meat samples and gave good recoveries. [Figure not available: see fulltext.].
|Appears in Collections:||政治學系|
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