Novel Preparation and Characterization of Fe₂O₃/CNT Thin Films for Flammable Gas Sensors

Abstract

In this work, novel preparation for Fe2O3/CNT thin films was investigated. The Fe/CNT thin films were synthesized through vertical floating-catalyst chemical vapor deposition technique (FC-CVD) and subsequently annealed in air. The various annealing temperature to create Fe2O3 was examined and characterized by field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Ultraviolet–visible spectroscopy (UV-Vis) and Raman spectroscopy. In addition, effect of wet/dry process on gas sensing of Fe2O3/CNTs was also investigated. The results suggest that the interfacial oxide layer helps to significantly improve LPG sensing performance with rapid response and recovery times. The proposed method can be considered as a promising approach for producing ultra-Fe2O3/CNT thin films that are appropriate for sensing application.

Recent trends in gas sensingviacarbon nanomaterials: outlook and challenges

“…Therefore, several hazardous air pollutants such as NO 2 , CO, CO 2 , and CH 4 , explosive gases, and VOCs have been detected via CNT-based gas sensors with a shorter recovery time in comparison with MOS sensors. 72 The effects of these gaseous agents have also been studied theoretically by using first-principal approximations and density calculations. In this case, Kumar et al studied the adsorption mechanism theoretically via DFT implemented in the computational quantum chemical HF code of the 6-31G basis set on (1,1) and (2,2) CNTs.…”