Facile preparation of hierarchical Sb-doped In2O3 microstructures for acetone detection

In this work, the peony-like hierarchical Sb-doped In2O3 flowers with different Sb contents have been successfully fabricated via the oxidization conversion of hydrothermally synthesized In2S3 precursors. The results of the sensing properties indicate that the as-fabricated sensors based on 2 mol% Sb-doped In2O3 hierarchical microstructures exhibit high response (64.3 for acetone with 50 ppm), fast response/recovery time (8/27 s), and long term stability characteristics towards acetone gas. Furthermore, selective detection of acetone can be readily achieved with sensors attached with 2 mol% Sb-doped In2O3 even with other common chemicals such as ethanol, methanol, benzene and ammonia around, which provide insights and strategies for developing novel acetone gas sensors used to monitor air-quality and environmental.