The facile synthesis of MoO3 microsheets and their excellent gas-sensing performance toward triethylamine: high selectivity, excellent stability and superior repeatability

Abstract

In this work, MoO₃ microsheets were successfully prepared by thermally oxidizing the MoO₂ nanospheres synthesized by a hydrothermal method. The crystal structures and morphologies of precursor MoO₂ and the final product were characterized by XRD, FESEM, and TEM. Gas sensors based on MoO₃ were fabricated and their gas sensing properties were tested. These results revealed that they exhibited excellent sensing performance towards triethylamine (TEA) with high selectivity, good repeatability, relatively high response and short response time (<3 s). In particular, the fabricated sensor displayed excellent long-term stability and superior selectivity, making it a promising triethylamine gas sensor. The possible reasons related to these characteristics of MoO₃ microsheets are further discussed.