Preparation of p-LaFeO3/n-Fe2O3 Heterojunction Composites by One-Step Hydrothermal Method and Gas Sensing Properties for Acetone

Perovskite LaFeO3 materials have received increasing attention in volatile organic compound (VOC) gas detection due to their unique crystal structure and excellent physicochemical properties. However, achieving high sensitivity with a low limit of detection at low temperature is still an important research topic. In this work, p-LaFeO3/n-Fe2O3 composites were prepared by a simple one-step hydrothermal method for the detection of acetone gas. Various characterizations showed that the LaFeO3/Fe2O3 composites were successfully synthesized. The test results showed that the LaFeO3/Fe2O3 composites have more excellent gas sensing properties than acetone compared with pure LaFeO3 material. The response of the LaFeO3/Fe2O3 sensor to 10 ppm acetone (23.5) at 210 degrees C is almost five times larger than that of the pure LaFeO3 material. In addition, the LaFeO3/Fe2O3 sensor has a low limit of detection (100 ppb), good long-term stability, and selectivity. The enhanced acetone sensing performance can he ascribed to changes in the electronic structure and surface properties caused by heterojunctions, as well as to the synergistic effect formed between the two components. This work provides a simple synthetic strategy to enhance the acetone gas sensing performance of perovskite-type LaFeO3, which has promising applications in industrial production and healthcare.

Automated summary

In this study, LaFeO3/Fe2O3 composites were synthesized by a hydrothermal method for the detection of acetone gas. The composite material showed superior gas sensing properties compared to pure LaFeO3, with a response almost five times higher. It also exhibited a low limit of detection, good long-term stability, and selectivity.