(393ba) Electrospun Metal Oxide Nanofibers for Selective High Temperature CO Detection
A high temperature CO sensor was developed based on electrospun metal oxide nanofibers. The morphology of the nanofibers was investigated by scanning electron microscopy (SEM) and transmission electron microscopy and the cystal structure and composition was examined by X-ray diffaction (XRD). The high temperature stability was investigated by SEM and XRD. The impedance spectroscopy of the as-prepared nanofibers based sensor was investigated in N2 and different gas mixtures (O2, CO, CO2, NO and SO2 balanced by N2 in varied concentrations) at 800 oC to study the interaction between the sensing materials and different gases. Sensitive, selective and stable detection of CO in high temperature environment was achieved, suggesting that the as-prepared nanofiber is a promising material for the application of high temperature CO sensors. The interference responses from other gases (O2, CO2, NO and SO2) are examined. The analytical characteristics such as limit of detection, reproducibility, and accuracy will also be discussed.