Journal
SENSORS
Volume 18, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s18071986
Keywords
nitrite; electrochemical sensor; glassy carbon electrode; graphene; chitosan; Au nanoparticles
Funding
- National Natural Science Foundation of China [21405024]
- Science and Technology Planning Project of Guangdong Province [2016A020210114]
- Science and Technology Planning Project of Zhanjiang City [2016C01002]
- Science and Technology Planning Project of Shenzhen City [JCYJ20170818111719650]
- Industrial Development Special Funds of Dapeng New Area [KY20170209]
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A highly sensitive nitrite (NO2-) electrochemical sensor is fabricated using glassy carbon electrode modified with Au nanoparticle and grapheme oxide. Briefly, this electrochemical sensor was prepared by drop-coating graphene oxide-chitosan mixed film on the surface of the electrode and then electrodepositing a layer of Au nanoparticle using cyclic voltammetry. The electrochemical behavior of NO2- on the sensor was investigated by cyclic voltammetry and amperometric i-t curve. The results showed that the sensor exhibited better electrocatalytic activity for NO2- in 0.1 mol/L phosphate buffer solution (PBS) (pH 5.0). The oxidation peak current was positively correlated with NO2- concentration in the ranges of 0.9 mu M to 18.9 mu M. The detection limit was estimated to be 0.3 mu M. In addition, the interference of some common ions (e.g., NO3-, CO32-, SO42-, Cl-, Ca2+ and Mg2+) and oxidizable compound including sodium sulfite and ascorbic acid in the detection of nitrite was also studied. The results show that this sensor is more sensitive and selective to NO2-. Therefore, this electrochemical sensor provided an effective tool for the detection of NO2-.
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