Designed Synthesis of In₂O₃ Beads@TiO₂–In₂O₃ Composite Nanofibers for High Performance NO₂ Sensor at Room Temperature

Abstract

Porous single crystal In2O3 beads@TiO2-In2O3 composite nanofibers (TINFs) have been prepared via a facile electrospinning method. The beads were formed because of the existence of hemimicelles in pecursor solution. The formation of hemimicelles was attributed to the synergy of tetrabutyl titanate (TBT) and polyvinylpyrrolidone (PVP). Abundant In(3+) ions were drawn toward the ketonic oxygen of PVP resulting in In(3+) ions aggregation. Compared with pristine In2O3 nanofibers (INFs), the as-prepared TINFs exhibited excellent properties for sensing NO2 gas at room temperature (25 °C). The enhanced sensing property was due to much absorbed oxygen and Schottky junctions between the porous single crystal In2O3 beads and the Au electrode of the sensor. The strategy for combining the unique In2O3 beads@TiO2-In2O3 nanofibers structure which possessed superior conductivity and sufficient electrons with the addition of TiO2 offered an innovation to enhance the gas sensing performance.

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

“…Thus, the development of NO 2 gas sensors with high sensitivity and low detect limitation is urgently necessary. At present, metal oxide semiconductors with various nanostructures, such as SnO 2 [3][4][5], ZnO [6,7], WO 3 [8,9], and TiO 2 [10], have been well investigated to detect NO 2 owing to their low cost, simple operation, and nontoxic nature. Among them, tungsten oxide, a n-type semiconductor with wide bandgap (2.6-3.2 eV), has been considered as a promising sensing material for the detection of NO 2 because of its low cost, high sensitivity, and good repeatability [11][12][13].…”

Mulberry-like heterostructure (Fe–O–Ti): a novel sensing material for ethanol gas sensors

“…6d) were located at 458.66 and 463.8 eV, which tted well with the binding energy of TiO 2 . [32][33][34] The result of XPS analysis further demonstrates that preparation of the Fe-O-Ti nanoparticles is the success.…”

Fabrication of Nanosized Island-Like CdO Crystallites-Decorated TiO2 Rod Nanocomposites via a Combinational Methodology and Their Low-Concentration NO2 Gas-Sensing Behavior

“…The recovery times are in the range of 305–341 s when the TiO 2 -CdO rods were exposed to 1.0–5.0 ppm NO 2 gas, respectively. Table 1 summarized NO 2 gas-sensing performance of other one-dimensional TiO 2 -based heterostructures prepared by various methods [ 35 , 36 , 37 , 38 ]. Comparatively, the TiO 2 –CdO rods have potential in gas sensor applications in detecting low-concentration NO 2 gas.…”