Efficient Fluorescence “Turn-On” Sensing of Dissolved Oxygen by Electrochemical Switching

다국어 초록 (Multilingual Abstract)

<P>We report on a novel method for sensing oxygen that is based on the use of a perylene diimide dye (<B>1</B>) which is electrochemically reduced to its nonfluorescent dianion form (<B>1</B><SUP>2–</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 (0.0–4.0% 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.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2012/ancham.2012.84.issue-21/ac301830a/production/images/medium/ac-2012-01830a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac301830a'>ACS Electronic Supporting Info</A></P>