摘要
A novel non-enzymatic nitrite sensor was fabricated by immobilizing MnOOH-PANI nanocomposites on a gold electrode （Au electrode）. The morphology and composition of the nanocomposites were investigated by transmission electron microscopy （TEM） and Fourier transform infrared spectrum （FTIR）. The electrochemical results showed that the sensor possessed excellent electrocatalytic ability for NO2 oxidation. The sensor displayed a linear range from 3.0 μmol·L^-1 to 76.0 mmol·L^-1 with a detection limit of 0.9 μmol·L^-1 （S/N=3）, a sensitivity of 132.2 μA·L·mol^-1·cm^-2 and a response time of 3 s. Furthermore, the sensor showed good reproducibility and long-term stability. It is expected that the MnOOH-PANI nanocomposites could be applied for more active sensors and used in practice for nitrite sensing.
A novel non-enzymatic nitrite sensor was fabricated by immobilizing MnOOH-PANI nanocomposites on a gold electrode （Au electrode）. The morphology and composition of the nanocomposites were investigated by transmission electron microscopy （TEM） and Fourier transform infrared spectrum （FTIR）. The electrochemical results showed that the sensor possessed excellent electrocatalytic ability for NO2 oxidation. The sensor displayed a linear range from 3.0 μmol·L^-1 to 76.0 mmol·L^-1 with a detection limit of 0.9 μmol·L^-1 （S/N=3）, a sensitivity of 132.2 μA·L·mol^-1·cm^-2 and a response time of 3 s. Furthermore, the sensor showed good reproducibility and long-term stability. It is expected that the MnOOH-PANI nanocomposites could be applied for more active sensors and used in practice for nitrite sensing.
基金
Acknowledgement The authors gratefully acknowledge the financial support of this project by the National Science Foundation of China （No. 21575113）, the Specialized Research Fund for the Doctoral Program of Higher Education （No 20126101110013）, the Natural Science Foundation of Shaanxi Province in China （No. 2013KJXX-25）, and the Scientific Research Foundation of Shaanxi Provincial Key Laboratory （Nos. 15JS100 and 16JS099）.
