Efficient Fluorescence 鈥淭urn-On鈥?Sensing of Dissolved Oxygen by Electrochemical Switching

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• 作者：Ik-Soo Shin ; Thomas Hirsch ; Benno Ehrl ; Dong-Hak Jang ; Otto S. Wolfbeis ; Jong-In Hong
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：November 6, 2012
• 年：2012
• 卷：84
• 期：21
• 页码：9163-9168
• 全文大小：314K
• 年卷期：v.84,no.21(November 6, 2012)
• ISSN：1520-6882

文摘

We report on a novel method for sensing oxygen that is based on the use of a perylene diimide dye (1) which is electrochemically reduced to its nonfluorescent dianion form (1^{2鈥?/sup>). In the presence of oxygen, the dianion is oxidized to its initial form via an electron-transfer reaction with oxygen upon which fluorescence is recovered. As a result, the fluorescence intensity of the dianion solution increases upon the addition of oxygen gas. Results demonstrate that high sensitivity is obtained, and the emission intensity shows a linear correlation with oxygen content (0.0鈥?.0% v/v) at ambient barometric pressure. In addition, using electrochemical reduction, oxygen determination becomes regenerative, and no significant degradation is observed over several turnovers. The limit of detection is 0.4% oxygen in argon gas.}