Abstract
An experimental study about fluorophores, which have never been used before in thermometric applications has been carried out for the development of fluorescence based temperature sensors. Fluorescent dyes like: 10-(3-sulfopropyl) acridinium betaine, quinacrine dihydrochloride, naphthofluorescein, fluorescein and 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt have been immobilized on sol-gel derived coatings deposited on optical fibers by dip coating. Comparison between the characteristics of the different sensors revealed that the fluorescent dye 10-(3-sulfopropyl) acridinium betaine showed the best performances: a sensitivity around 1 °C, response time lower than 8 s in thermal transitions between 30 and 250 °C and negligible hysteresis along the dynamic range: 30-250 °C (220 °C). Extended study of cross-sensitivity and fluorescence degradation when sensors are exposed to volatile organic compounds or humidity variations has been performed with 10-(3-sulfopropyl) acridinium betaine. Consequently, methods for isolating the sensors to the effect of harmful atmospheres have also been developed.
| Original language | English |
|---|---|
| Pages (from-to) | 425-432 |
| Number of pages | 8 |
| Journal | Sensors and Actuators B: Chemical |
| Volume | 118 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 25 Oct 2006 |
| Externally published | Yes |
Keywords
- 10-(3-Sulfopropyl) acridinium betaine
- Dip coating
- Fluorescence
- Optical fiber
- Sol-gel
- Temperature sensor