Oxygen-sensing properties of optical sensor using layer of 1-pyrenedodecanoic acid and perfluorocar- boxylic acid (perfluorodecanoic acid and perfluorotetradecanoic acid) chemisorbed onto anodic oxidized aluminium plate was investigated. The sensitivity index I0/I100, where I0 and I100 represent the detected fluorescence intensities from a substrate exposed to 100 % argon and 100 % oxygen, respectively, and Stern-Volmer constant, KSV values decreased with increase in the molar ratio of perfluorocarboxylic acid to 1-pyrenedodecanoic acid. The oxygen-sensitivity of optical sensor using 1-pyrenedodecanoic acid is controlled by perfluorocarboxylic acid chemisorption. The response time of the 1-pyrenedodecanoic acid layer is 5.0 s on going from argon to oxygen and the recovery time is 50 s on going from oxygen to argon, respectively. In contrast, the response and recovery times of the 1-pyrenedodecanoic acid and perfluorocarboxylic acid chemisorbed layer are less than 3.5 s and 35 s, respectively. Thus, the optical oxygen sensor using 1-pyrenedodecanoic acid and perfluorocarboxylic acid chemisorbed layer has rapid response and recovery times.
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