Enhance the Room‐Temperature Gas Sensing Performance of TiO ₂ Nanoparticles Prepared Using a Chemical Technique

Vertically aligned titanium dioxide nanorods (TiO 2 NRs) have recently been considered to be suitable structures for the creation of extremely selective and sensitive gas sensors. To improve the performance of the nitrogen dioxide (NO 2 ) gas sensor at room temperature, TiO 2 NRs were hydrothermally formed on FTO substrates at different growth times. X‐ray diffraction showed the rutile phase of the main pattern. The morphologies and crystalline structure confirmed the tetragonal rutile structure of the TiO 2 samples. The well‐crystallized nanorods are said to have grown in the (001) direction, according to the enhanced (002) peak at 62.8°, the images obtained with an FESEM demonstrate the influence of the TiO 2 NRs’ growth time. With diameters ranging from 32.06 to 44.77 nm for TiO 2 nanoparticles (30 and 60 min), respectively, the images showed extremely homogenous surfaces. This indicates that all of the TiO 2 materials that have been studied include nonmetric particles smaller than 100 nm, and the crystal size equal to 16.3 nm at 30 min and 17.7 nm at 60 min duration. By examining the UV‐visible spectra of the produced TiO 2 NRs, the optical characteristics were examined. It is evident that as the growth time increases, the absorption edge shifts toward higher wavelengths. The optical energy gap of TiO 2 NRs decreases from 3.64 to 3.56 eV with different growth times. The findings demonstrated that TiO 2 NRs had the best sensing performance when their hydrothermal reaction time was 60 min. This work proposes a reliable procedure for fabricating a NO 2 gas sensor that exhibits peak sensitivity when operated at 100°C.