C₂H₅OH sensing properties of solid-state mediated BiOBr nanoplates

In present work, hierarchical bismuth oxybromide nanoplates (BiOBr NPs) have been synthesized rapidly through a simple solid-state reaction method without any template/surfactant/additives at room temperature and utilized it as gas sensing materials. Various techniques were used to characterize the structure, composition, and morphology of as-synthesized BiOBr products. Structural and compositional analysis supports to crystalline tetragonal configuration of BiOBr NPs. A compact arrangement of BiOBr NPs, with ∼600 nm length and width of ∼300 nm, was confirmed through morphological study. Gas sensing measurements on as-fabricated BiOBr NPs sensors were performed towards different target gases thoroughly and discussed. The sensors based on solid-state processed BiOBr NPs are responsive (R_a/R_g = 11.40, 1000 ppm) towards C₂H₅OH at 300 °C together with excellent response reversibility kinetics. Nanoplate-type BiOBr structure offers a specific surface area of 18.29 m²/g to enhance the exposed surface sites for the chemisorption of C₂H₅OH gas molecules and contributed in higher response. This work provides a rapid, easy, and efficient mode to fabricate BiOBr NPs, which can be applied to synthesize other oxide structures too, for the application of sensitive C₂H₅OH gas sensors.