氧气
荧光
化学
猝灭(荧光)
分析化学(期刊)
极限氧浓度
分子
阳离子聚合
人口
分压
光化学
氧传感器
化学物理
环境化学
物理
光学
有机化学
社会学
人口学
作者
Ruixiang Wu,Ruiyun Chen,Haitao Zhou,Yaqiang Qin,Guofeng Zhang,Chengbing Qin,Yan Gao,Ya‐Jun Gao,Liantuan Xiao,Suotang Jia
摘要
We present a sensitive method for detection of ultra-low oxygen concentrations based on the fluorescence blinking dynamics of single molecules. The relationship between the oxygen concentration and the fraction of time spent in the off-state, stemming from the population and depopulation of triplet states and radical cationic states, can be fitted with a two-site quenching model in the Stern-Volmer plot. The oxygen sensitivity is up to 43.42 kPa−1 in the oxygen partial pressure region as low as 0.01–0.25 kPa, which is seven times higher than that of the fluorescence intensity indicator. This method avoids the limitation of the sharp and non-ignorable fluctuations that occur during the measurement of fluorescence intensity, providing potential applications in the field of low oxygen-concentration monitoring in life science and industry.
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