α-Fe_2O_3气敏纳米粉体的红外光谱

IR Spectra of α Fe 2O 3 Gas sensing Nanopowder

研究了不同粒径的αＦｅ２Ｏ３纳米粉体在红外光谱中的ＦｅＯ特征振动带，结果表明当粒径为５０ｎｍ时出现Ａ２ｕ振动，减少到１０ｎｍ时，Ｅｕ振动带劈裂为双峰。根据在不同温度下烧结的αＦｅ２Ｏ３粉体中残存硝酸根的红外光谱峰强度变化。

The pattern of Fe O vibration in the IR spectra of α Fe 2O 3 nanopowder with different crystal sizes was studied. The A 2u vibration mode can be observed as the size decreasing to 50nm. The E u band is split into two peaks when the size is decreased to 10nm. The intensity of the residual nitrate in the IR spectra of the nanopowder calcinated at different temperatures was also investigated. The result implies that the residual nitrate could enhance the gas sensitivity of the thick film sensor.