Fabrication of monodispersed hollow flower-like porous In2O3 nanostructures and their application as gas sensors

Abstract

The solvothermal method using L-lysine as a surfactant and ethylene glycol as an efficient auxiliary was used to prepare mono-dispersed, hollow, flower-like porous (HFP) In₂O₃. The morphology of the materials was characterized through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In addition the structure and composition were analysed using X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The sensing performance of the In₂O₃ material for 500 ppb NO₂ was evaluated at near room temperature 40 °C. The results revealed that the HFP-In₂O₃ exhibited better gas-sensing properties, indicating its practical potential for detecting NO₂ at lower concentrations and temperatures.