期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 135, 期 1, 页码 46-51出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.07.017
关键词
Oxygen sensor; Calorimetric; Luminescence; Platinum octaethylporphyrin; LED
资金
- EPRSC
A simple colorimetric oxygen sensor using a coloured LED and only one luminescent oxygen-sensitive emissive layer is described. A green LED acts as both a green emission source and an excitation source for a film of oxygen-sensitive Pt octaethylporphyrin (PtOEP) in ethyl cellulose containing TiO(2) or ZnO as a scattering agent. This gives a sensor with a traffic light, red-yellow-green, response to increasing oxygen concentration. The addition of the singlet oxygen stabiliser diazobicyclo[2.2.2]octane increases the sensor stability significantly. Because of the relatively thick sensor layer used response times are long, with 90% response times of ca. 1000 s for nitrogen to oxygen and ca. 300 s for oxygen to nitrogen. (c) 2008 Elsevier B.V. All rights reserved.
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