Simultaneously measured photoluminescent and conductive properties of printed ZnO nanocrystals under Ar/O2 mixtures

摘要

In this work, both optical and electrical responses of screen-printed metal oxide gas sensors are measured under different Ar/O2 mixtures at room temperature. Printed gas sensors are based on ZnO nanocrystals deposited and further sintered at 400°C on interdigitated Pt electrodes. The ZnO ～5 nm nanoparticles synthetized by an organometallic route form aggregates after deposition and present surface defects observed on photoluminescence (PL) spectrum. Current and PL intensity variations are simultaneously compared under Ar/O2 mixtures at room temperature. The sorption kinetics appear to be clearly different, with higher sensitivity for electrical conduction but unstable signal and longer time responses.