石墨烯
电极
壳聚糖
纳米颗粒
亚硝酸盐
电化学
材料科学
纳米技术
化学工程
无机化学
化学
硝酸盐
有机化学
工程类
物理化学
作者
Rijian Mo,Xuehua Wang,Qiong Yuan,Xiemin Yan,Tiantian Su,Yanting Feng,Lulu Lv,Chunxia Zhou,Pengzhi Hong,Shengli Sun,Zhe Wang,Chengyong Li
出处
期刊:Sensors
[Multidisciplinary Digital Publishing Institute]
日期:2018-06-21
卷期号:18 (7): 1986-1986
被引量:51
摘要
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 µM to 18.9 µM. The detection limit was estimated to be 0.3 µM. 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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