Hybrid Clay / Porphyrin Nanomaterials for Oxygen Sensing

Abstract

The presented research is focused on the investigation of hybrid systems of hosting clay minerals with incorporated metallated porphyrin molecules. These systems are used with intention to develop materials suitable for the construction of perspectively efficient oxygen sensors, as well as for the singlet oxygen production. As a guest materials, metalloporphyrins containing a heavy metals such as platinum and palladium are usually utilized. These are known to be very efficient for the oxygen sensing applications due to a “heavy atom effect”. This effect promotes a spin-orbit coupling, resulting in the fact that almost all of the radiation from singlet excited state undergoes the intersystem crossing, followed by a de-excitation via a triplet state. As a result, a phosphorescence from these systems can be observed in a presence of an inert gas, e.g. nitrogen. However, in a presence of a reactive oxygen the collisional quenching takes place, resulting in a diminish of phosphorescence. By changing the nitrogen-to-oxygen atmosphere and vice versa, one can study the behaviour of an “on-off” type sensing. It was found out that the clay/metalloporphyrin nanomaterials are perspective candidates for optical oxygen sensing applications. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35279