Abstract
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 μM, with a sensitivity of 0.0267 A M - 1. The limit of detection (LOD) was 1 μM. 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.
| Original language | English |
|---|---|
| Pages (from-to) | 75-78 |
| Number of pages | 4 |
| Journal | Electrochemistry Communications |
| Volume | 17 |
| Issue number | 1 |
| DOIs | |
| State | Published - Apr 2012 |
Bibliographical note
Funding Information:This work was supported by the National Science Council and the Ministry of Education of Taiwan (Republic of China) .
Keywords
- Amperometry
- Chemically reduced graphene oxide
- Electrocatalysis
- Nitrite
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