Preparation of Cd-Loaded In2O3 Hollow Nanofibers by Electrospinning and Improvement of Formaldehyde Sensing Performance

الملخص EN

Pure In2O3 and Cd-loaded In2O3 hollow and porous nanofibers with different Cd/In molar ratios (1/20, 1/10, 1/1) were synthesized by electrospinning method.

X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and transmission electron microscopy (TEM) were used to characterize the nanofibers.

The porous nanofibers were composed of small grains.

The average grain sizes and the diameters of Cd-loaded In2O3 nanofibers increased with the increasing of Cd/In molar ratios.

The formaldehyde sensing properties of the sensors based on pure In2O3 and Cd-loaded In2O3 nanofibers were investigated in formaldehyde concentration range of 0.5∼100 ppm.

Moreover, the selectivity of those sensors was studied by testing responses to methanol, toluene, ethanol, acetone, and ammonia.

The result showed that Cd-loaded In2O3 nanofibers with Cd/In molar ratio of 1/10 possessed the highest response value and good selectivity at operating temperature 280°C.

In addition, the formaldehyde sensing mechanism of the sensors based on Cd-loaded nanofibers was briefly analyzed.