Novel optical oxygen sensing by phosphorescence quenching of palladium porphyrin self-assembled film on alumina plate
✍ Scribed by Yutaka Amao; Keisuke Asai; Ichiro Okura
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 66 KB
- Volume
- 04
- Category
- Article
- ISSN
- 1088-4246
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✦ Synopsis
An optical oxygen sensor based on the phosphorescence quenching of palladium tetrakis(4-carboxyphenyl)porphyrin (PdTCPP) self-assembled film (SAM) on alumina plate was developed. The phosphorescence intensity of PdTCPP film decreased with increasing oxygen pressure, indicating that the film can be used as an optical oxygen-sensing device based on phosphorescence quenching by oxygen. The ratio I~0~/I~100~ as a sensitivity measure of the sensing film is estimated to be 17.7, showing that the film is a highly sensitive device for oxygen pressure. The film obeyed Stern–Volmer plots with a multisite model and possessed good operational stability and a fast response. Response times are 36 s for deoxygenated to oxygenated conditions and 148 s for the reverse conditions.