Background: A sensing material of zinc oxide (ZnO) was investigated for its use in the
electrospun nanofibers for gas sensing. The metal oxide semiconductor gas sensor response is caused
by the oxygen that undergoes a chemical reaction on the surface of an oxide, resulting in a change in
the measured resistance.
Objective: One-dimensional nanofibers gas sensor have high sensitivity and diverse selectivity.
Methods: One-dimensional nanofiber by an electrospinning method was collected and a sensing
membrane was formed. In addition, the gas sensing mechanism was discussed and verified by X-ray
photoelectron spectroscopy (XPS).
Results: The ZnO nanofiber membrane had an optimum crystalline phase with a lattice spacing of
0.245 nm and a non-woven fabric structure at a calcination temperature of 500°C, whereas the nanofiber
diameter and membrane thickness were about 100 nm and 8 μm, respectively. At an operating
temperature of 200°C, the sensing material exhibited good recovery and reproducibility in response
to Carbon monoxide (CO), and the concentration was also highly discernible. In addition, the reduction
in the peak of OIII at 531.5 to 532.5 eV according to the analysis of XPS was consistent with the
description of the sensing mechanism.
Conclusion: The gas sensor of ZnO nanofiber membranes has high sensitivity and diverse selectivity,
which can be widely applied in potential applications in various sensors and devices.