The application and development of a gaseous nitric oxide sensor for highly selective nitrite detection
| Autor: | Ya-Li Hsu, 徐亞力 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 We have developed an amperometric NO gas sensor based on a screen-printed edge band carbon ultramicroelectrode (designated as SPUME) deposited with Pt nanoparticles and coated with Nafion as solid polymer electrolyte. The concentration of nitrite is determined indirectly by measuring the amount of NO generated from the reaction of nitrite and sulfuric acid. Under optimized conditions, the calibration curve was linear in the range of 0.2 μM – 10 mM and the detection limit (S/N = 3) was calculated as 3.7 nM. The major advantage of detection in gas phase is to avoid the interference of easily oxidized molecules. In real sample analysis, an almost 100% recovery values was achieved for the detection of nitrite in cured meat and vegetable. Compared to official spectrophotometric method, the sample preparation is much simpler and avoids the use of toxic reagent. The proposed method is promising for in-situ analysis due to simple pre-treatment procedure. Furthermore, We also presented a facile way to fabricate bimetallic nano–PtPd material on SPUME, which exhibits a highly electrocatalytic performance for redox of NO. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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