Synthesis of a novel in₂o₃-innbottle nanotube using in-situ partial oxidation with enhanced gas sensing platform to detect NO₂

A brand-new gas sensor nanocomposite, In₂O₃-InN, was synthesized by in-situ partial oxidation of InN and presented fast response–recovery property for NO₂ detecting. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray detection (EDX) analysis. The results show that the final In₂O₃-InNcomposites were composed of hexagonal type In₂O₃ and hexagonal type InN, which exhibited bottle nanotube structure on the relative macroscopic level. Microscopically, atthe interface of In₂O₃ and InN, n–n heterojunction formed. Works form gas sensing property found that it is obviously that In₂O₃-InNgot a quite stronger response, 1021, at relatively lower temperature, 100 °С, comparing to pure In₂O₃, 279.1 at 150 °С.After doping, the gas-sensing performance was improved. By analyzing the concentration of oxygen vacation and n–n heterojunctions mechanism, it wasverified that the superiority of gas sensing properties of the In₂O₃-InNcan be attributed to the high concentration of oxygen vacancies and the formation of n–n heterojunctions.