Stabilizing perovskite quantum dot oxygen sensors through ultra-long 2 mm horizontally aligned nanopores in anodic alumina oxide templates

Abstract

Perovskite quantum dots (PQDs) have attracted significant attention as fluorescent oxygen gas sensors due to their exceptional optical and electronic properties. However, their application is hindered by stability challenges in oxygen-rich environments, particularly under UV-light exposure and oxidative conditions. This study addresses these stability issues by employing ultra-long 2 mm horizontally aligned nanopores in anodic alumina oxide (HAAO) templates as a novel protective strategy. The highly ordered nanopore structure of the HAAO templates acts as a robust scaffold, effectively mitigating oxidative degradation and enhancing the stability of PQDs in oxygen-sensing applications. The resulting gas sensors exhibit a response time of approximately 83.9 seconds and a recovery time of around 113.3 seconds. Long-term stability assessments, extending over 504 hours, demonstrate that PQDs embedded within HAAO maintain their performance integrity, even under prolonged exposure to UV-light and oxygen-rich conditions. This synergistic integration of PQDs and HAAO not only stabilizes the sensors but also positions them as robust candidates for oxygen detection in challenging environments, paving the way for further innovation and optimization in this field.