Enhanced acetone sensing properties of Eu‐In 2 O 3 nanotubes with bumps

Pure and Eu‐In 2 O 3 nanotubes with bumps were synthesised via electrospinning and calcination method. The crystal structure and morphologies of the as‐prepared materials were characterised by X‐ray diffraction (XRD), energy‐dispersive spectrometer and scanning electron microscopy (SEM), respectively. The SEM images displayed the unique nanotube structure which is constructed with bumps on the nanotube surface. Tests on gas sensing properties validated that the response of Eu‐In 2 O 3 nanotube sensors to 20 ppm acetone was up to 20 at 240°C which was 3.4 times larger than that of the pure (5.8) and the response and recovery times were 3 and 90 s, respectively. The sensor could detect 200 ppb acetone with a response of 2. It showed excellent selectivity to acetone and sorted acetone from ethanol successfully which has similar properties with acetone.