SENSORES ÓPTICOS FOTOLUMINESCENTES DE BAIXO CUSTO PARA DETECÇÃO DE OXIGÊNIO APLICADOS EM SISTEMAS DE CONTROLE E MONITORAMENTO AMBIENTAL

Abstract

This work reports the development of photo-luminescent sensors for oxygen detection using thin films of polystyrene doped with Platinum octaethylporphyrin dye, deposited directly on the surface of commercial opto-electronic and MOS devices. This manufacturing strategy allowed to integrate the sensor active part with the detectors of photoluminescent emission (optoelectronic and MOS device). The detection principle is based on quenching the photoluminescent emission of Platinum octaethylporphyrin molecule by interaction with oxygen molecules from the environment. The manufactured devices showed high sensitivity to oxygen in the range of 0 to 20% O2, in both cases. This new fabrication strategy showed to be promising for a future integration process of these devices in embedded electronic systems, with acquisition capacity and signal processing, giving rise to a portable low cost system that can be applied to the monitoring of dissolved oxygen in rivers. Index Terms - Luminescence quenching, MOS sensor, Optical oxygen detection, Platinum octaethylporphyrin (PtOEP).