| Molten salt solvent method is very simple, environment-friendly and cost effective, so it is suitable for the preparation of nano-materials.BaTiO3 nano-wires were prepared by molten salt method from different barium precursors. All the samples were characterized using BET, X-ray diffraction (XRD), differential scanning calorimetry measurements (DSC/TG), scanning electron microscopy (SEM) and transmission electron microscope (TEM) techniques. The possible effects of various factors on BaTiO3 nano-wires were investigated. In order to find influences of the precursors on the humidity sensing behavior, the humidity sensitivity of the as-prepared nano-wires were tested. The humidity sensing mechanism was further investigated.The results indicated that the factors, such as calcination temperature, holding time and precursor species etc., all greatly influence the morphologies of BaTiO3 nano-wires. BaTiO3 nano-wires were prepared through controlling the shape and size of the product powders through adjusting the synthetic temperature and the ratio of raw materials.Moreover, the current work also provided a proposed synthetic mechanism of BaTiO3 nano-wires which were prepared by barium nitrate. The results revealed that the dissolution rate of titanium dioxide was a critical factor which determined the shapes of the final products. The results indicated in comparison with barium nitrate and barium carbonate precursors, the humidity hysteresis of barium acetate and barium hydroxide precursors are smaller. Furthermore, their recovery times are also shorter. Among all the four precursors, the recovery time of barium hydroxide is the smallest, which is only 3s. |
PDF Full Text Request