Akademik Veri Yönetim Sistemi
ANALYTICAL LETTERS, cilt.48, sa.3, ss.489-502, 2015 (SCI-Expanded)
The monitoring of green house gas carbon dioxide of great global significance. In this study, a natural zeolite-polymer composite material was used for the first time for the sensing of dissolved and gaseous carbon dioxide with a spectrofluorimetric method. A carbon dioxide gas sensitive dye, 8-hydroxypyrene-1, 3, 6-trisulfonic acid, was used in its ion pair form either entrapped in the pores of zeolite-polymer composite as a thin film or in an electrospun polymer coated zeolite. The zeolite was modified with sodium hydroxide solution in order to supply a functional environment for the dye. The zeolite was preferred for its superior characteristics, including forming a porous, selective, and filtering layer to improve the selectivity and sensitivity of the sensor. The sensing membranes containing zeolites exhibited nearly a six-fold enhancement in the sensitivity and wide dynamic range between 0.0% and 100.0% gaseous carbon dioxide. The limits of quantification for gaseous and dissolved carbon dioxide were 0.5% and 9.89x10(-6)mol/L, respectively. The zeolite-polymer composite films were stable for a longer period than the free zeolite films. No significant changes in the fluorescence intensity and sensor characteristics were observed over three months. Future work may involve other natural or synthetic zeolites with specific pore diameters for the design of task specific sensors.