Highly selective amperometric nitrite sensor based on chemically reduced graphene oxide modified electrode

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• 作者：Veerappan Mani ; Arun Prakash Periasamy ; Shen-Ming Chen ; ^{smchen78@ms15.hinet.net}
• 关键词：Chemically reduced graphene oxide ; Nitrite ; Amperometry ; Electrocatalysis
• 刊名：Electrochemistry Communications
• 出版年：2012
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：April, 2012
• 卷：17
• 期：Complete
• 页码：75-78
• 文件大小：686 K

摘要

Herein, we report a highly selective amperometric nitrite sensor using a chemically reduced graphene oxide (CR-GO) modified glassy carbon electrode (GCE). The nitrite oxidation peak current (I_p) at CR-GO/GCE was 1.3 and 2.2 fold higher than that of electrochemically reduced graphene oxide (ER-GO) and unmodified GCEs respectively. Moreover, nitrite oxidation at CR-GO/GCE occurred at + 0.8 V, roughly 80 and 130 mV lower potential than ER-GO and unmodified GCEs respectively. CR-GO/GCE detects nitrite in the linear range of 8.9-167 渭M, with a sensitivity of 0.0267 A M^鈭?#xA0;1. The limit of detection (LOD) was 1 渭M. This sensor selectively detects nitrite even in the presence of 1000/250 fold of common ions and biological interferrants. CR-GO/GCE also demonstrates an excellent operational stability and good antifouling properties. The excellent recovery (~ 99%) achieved for nitrite determination in various water samples reveal its promising practicality.