Abstract <p>Recently, the development of an n-pentane-sensing product has always been plagued by the lack of suitable inorganic material with good gas-sensing response and selectivity at low operating temperatures. In this work, Ti-MIL-125-induced one-dimensional tubular In₂O₃/TiO₂ heterostructures have been fabricated by a facile electrospinning method and a subsequent heat-treatment process. Obvious morphological evolution from a fibrous to a tubular shape with the presence of In₂O₃-TiO₂ heterojunctions can be adjusted by varying the added amount of the Ti-ML-125 component. Compared with pure In₂O₃, the optimal In₂O₃/TiO₂ composites exhibit a blue-shifted energy band (2.52&#xa0;eV) and an increased specific surface area (227.70&#xa0;m²/g), as well as the enhanced gas-sensing performance on various concentrations of n-pentane. For example, In₂O₃/TiO₂-3% can not only display excellent long-term stability and humidity stability but also has a high response of 670–100&#xa0;ppm n-pentanol at 50°C, much larger than that of pure In₂O₃ (50) at 150°C. Significantly, In₂O₃/TiO₂-3% can still reach the high response of 197–100&#xa0;ppm n-pentanol at room temperature. According to density functional theory (DFT) calculations, the enhanced gas-sensing mechanism is mainly attributed to the combination of the distinctly increased surface active sites through the regulation of morphology and the introduction of effective In₂O₃-TiO₂ heterojunctions, which can be beneficial to improving the surface adsorption/desorption characteristics and the electron transport between n-pentanol and the sensing material interface.</p> Graphical Abstract <p></p>