Hydrothermal Synthesis Of Nano-porous Fe₂O₃ Gas-sensing Materials

In recent years, as more industrial accidents have happened, gas sensors have been paid more attention to and have been widely used in medical treatment, biotechnology, catalysts, and traffic safety. Nano-porous Fe₂O₃ gas sensing materials are prepared by the hydrothermal method; the materials obtained are characterized and analyzed by making use of XRD, SEM, BET, and so on. Nano-porous Fe₂O₃ gas sensing materials demonstrate better than other common materials for the special appearance. During the experiment, a variety of the appearances of nano- Fe2O3 are synthezed, including nano-particles, nano-porous structure of hollow spheres and nanorods, and each appearance is detailed analyzed, aiming to gain Fe₂O₃ gas sensing materials with structure advantage and gas advantages.The main contents of this paper are as follows: first, the development of nano-materials and the meaning of metal nano-materials in practical applications are expounded; the advantages of iron oxide nano-materials among these materials are also illustrated. Second, in the experiment, not only are the experimental apparatus, reagents, and preparation methods concisely described, but also the representation and analysis methods on different products are described. Third, sucrose and urea are taken as morphology control agents to synthesize iron oxide hollow microspheres. Forth, glucose is taken as morphology control agents to synthesize iron oxide hollow microspheres. During the experiment, different appearances of nano Fe₂O₃ gas sensing materials are prepared by changing the addition of glucose, the reaction time, and the reaction temperature; the products under each reaction condition are tested. Fifth, EDTA and glucose are prepared as morphology control agents to synthesize iron oxide hollow microspheres. By changing the ratio their addition to prepare products of different appearances and analyze its gas sensing properties.This paper aims to do various types of experiments by hydrothermal method, such as changing morphology control agents, reaction time, reaction temperature, the addition ratio of morphology control agents, analyzing and characterize the products, testing the gas sensing properties, and finding gas sensing materials with distinct nano-porous Fe₂O₃ structure and best gas sensing properties.