碘修饰多钼酸的制备及其气敏性能

Preparation and Gas Sensitivity of the Iodine-Modified Molybdic Acid

采用钼酸铵与硝酸通过直接沉淀法制备了六方晶型的多钼酸,将该多钼酸与碘酒在外加直流电场下的两个电极间研磨制备了碘修饰多钼酸。研究了该多钼酸对氨气、乙醇、丙酮、臭氧的气敏性质,结果表明碘修饰后的多钼酸对极性气体乙醇和氨气具有良好的灵敏性,且在低温范围内气敏性随温度升高而提高,而对非极性气体丙酮和臭氧灵敏性很低。因此,碘修饰多钼酸可成为一种潜在的新型检测极性气体用低温气敏材料。

Hexagonal molybdic acid was prepared through the reaction of （NH4）6 MoT O24 · 4H2O with HNO3, and iodine-modified molybdic acid was obtained by polarizing of the molybdic acid mixed with iodine under the external electric field and gritting conditions. The gas sensitivity of the iodine-modified molybdic acid to ammonia, ethanol, acetone and ozone was investigated, The results indicate that the iodine-modified molybdic acid shows high sensitivity to polar gases such as ethanol and ammonia, and the sensitivity was enhanced with increasing temperature at the range of low temperature, while low sensitivity to nonpolar gases such as acetone and ozone. Therefore, iodine-modified molybdic acid can be used as a new type of potential gas-sensing material to detect polar gases at low temperature.