Zinc Phthalocyanine Thin Film-Based Optical Waveguide H2S Gas Sensor

Abstract The detection of hydrogen sulfide (H 2 S) is essential because of its toxicity and abundance in the environment. Hence, there is an urgent requisite to develop a highly sensitive and economical H 2 S detection system. Herein, a zinc phthalocyanine (ZnPc) thin film-based K + -exchanged optical waveguide (OWG) gas sensor was developed for H 2 S detection by using spin coating. The sensor showed excellent H 2 S sensing performance at room temperature with a wide linear range (0.1 ppm–500 ppm), reproducibility, stability, and a low detection limit of 0.1 ppm. The developed sensor showed a significant prospect in the development of cost-effective and highly sensitive H 2 S gas sensors.