Abstract
This paper presents a high-sensitive and linear fiber-optic carbon dioxide (CO 2) sensor based on a sol–gel matrix composed of n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) doped with 1-hydroxy-3,6,8-pyrenetrisulfonic acid trisodium salt (HPTS, PTS-), silica particles and a tetraoctylammonium hydroxide (TOAOH) phase transfer agent (i.e. the base). The experimental results indicate that the relative fluorescence intensity of the ion pair form of HPTS dye decreases as the CO 2 gas phase concentration increases. The sensor has a sensitivity of approximately 26 and exhibits a uniquely linear response for CO 2 concentrations in the range of 0–100%. The sensitivity of the optical fiber CO 2 sensor is quantified in terms of the ratio I N 2 / I C O 2 , where I N 2 and I C O 2 represent the detected fluorescence intensities in pure nitrogen and pure carbon dioxide environments, respectively. The response time of the sensor is 9.8 s when switching from a pure N 2 atmosphere to a pure CO 2 atmosphere and 195.4 s when switching from CO 2 to N 2. The signal changes are fully reversible as the atmosphere is switched repeatedly between N 2 and CO 2. Overall, the experimental results demonstrate that the use of a sol–gel matrix doped with the ion pair form of HPTS and silica particles uniquely enhances the sensitivity and linearity of the proposed optic-fiber CO 2 sensor.
Published Version
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