Development of Highly Sensitive Metal-Free Tetraphenylporphyrin-Based Optical Oxygen Sensing Materials along with ILs and AgNPs

Authors : Merve ZEYREK ONGUN

Pages : 131-138

Doi:10.18466/cbayarfbe.507626

View : 15 | Download : 14

Publication Date : 2019-03-22

Article Type : Research Paper

Abstract :An oxygen sensitive optical chemical sensor has been developed based on fluorescence quenching of the meso-tetraphenylporphyrin (H 2 TPP) immobilized in a silicone derivative along with silver nanoparticles (AgNPs) and different ionic liquids (ILs). Emission spectra of the H 2 TTP doped thin film exhibited an increment due to the formation of an associated complex between H 2 TPP and AgNPs. The offered thin films responded to the oxygen in the direction of quenching with extreme sensitivity. Emission and decay-time measurements of the H 2 TPP in thin solid matrices were studied in the concentration range of 0-100% p(O 2 ). Utilization of the porphyrin dye along with AgNPs and ionic liquid as an additive exhibited higher oxygen sensitivity with respect to the additive-free forms and resulted in many advances such as linear response, improvement in sensor dynamics and extreme sensitivity. Together with additives, the meso-tetraphenylporphyrin-based composites yielded higher Stern-Volmer constant (Ksv), faster response time, and larger linear response range when compared with the additive-free form. The response time of the sensor has been recorded as 90 s
Keywords : meso tetraphenylporphyrin H2TPP, silver nanoparticles, ionic liquids, O2, sensing