Abstract
Carbon dioxide sensing ability of 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium (HPTS) has been improved by using nano-scale zinc oxide (ZnO) and silver coated zinc oxide (ZnO@Ag) particles. Sol-gel synthesized particles were characterized by XRD, XPS, SEM, FTIR and UV–vis spectroscopy. When the ion pair form of the HPTS embedded in ethyl-cellulose thin film along with the additives, resulted in many advances such as high relative signal change (I0/I100 = 116) and larger response range, improved sensor dynamics and higher sensitivity with respect to the additive-free form. More specifically, in the presence of the ZnO and ZnO@Ag nanoparticles, 80.0 and 97.0 % variation in relative signal intensity was observed for the concentration range of 0–20 % [CO2], respectively. The observed enhancement in the CO2 induced sensitivity of the HPTS can be attributed to the absorption-emission abilities of the ZnO and silver-coated-ZnO nanoparticles as well as their hygroscopic characteristics.
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