引用本文:
林德娟, 沈水发, 陈耐生, 黄金陵. 纳米半导体材料SO42-/La-α-Fe2O3的表面结构与酒敏特性[J]. 应用化学,
2002, 19(10): 972-975.
Citation: LIN De-Juan, SHE Shui-Fa, CHEN Nai-Sheng, HUANG Jin-Ling. The Surface Structure of Nano-semiconductor SO42-/La-α-Fe2O3 and Sensitivity to Ethanol[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 972-975.
Citation: LIN De-Juan, SHE Shui-Fa, CHEN Nai-Sheng, HUANG Jin-Ling. The Surface Structure of Nano-semiconductor SO42-/La-α-Fe2O3 and Sensitivity to Ethanol[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 972-975.
纳米半导体材料SO42-/La-α-Fe2O3的表面结构与酒敏特性
摘要:
对纳米半导体材料SO42-/La-T-Fe2O3进行了IR、XPS分析和比表面积测定实验,并制成厚膜型酒敏元件,探索了焙烧温度与灵敏度的关系以及气敏元件的稳定性。结果表明,样品中SO42-与La-T-Fe2O3表面的金属离子(Fe3+或La3+)结合构型是无机桥式配位型,SO42-的加入使Fe2p3/2电子结合能从710.85 eV提高到712.10 eV,表面Fe3+在SO42-的作用下显示出更正的电位,从而改变了半导体性质,由p型转变成为n型;在焙烧温度为450℃烧结的SO42-/La-T-Fe2O3元件,对酒精的灵敏度最高(S=35.7)、稳定性好。
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关键词:
- 纳米材料
- / SO42-/La-T-Fe2O3
- / 表面结构
- / 酒敏性
English
The Surface Structure of Nano-semiconductor SO42-/La-α-Fe2O3 and Sensitivity to Ethanol
Abstract:
Nano-semiconductive material SO42-/La-T-Fe2O3 has been characterized by means of IR、XPS and specific surface area measurements. The ethanol sensors were fabricated with the nano powders. The results indicated that SO42- is combined with Fe3+ of La-T-Fe2O3 through an inorganic bridge structure. Addition of SO42- makes the binding energy of Fep1/3 increased from 710.85 eV to 712.10 eV and Fe3+ became more positive in charge, thus, the semicudutivity of La-T-Fe2O3 is changed from the p-type into the n-type. The sensor fabricated from SO42-/La-T-Fe2O3, calcinated at 450℃ showed sensitivity of 35.7 to ethyl alcohol and good stability.
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Key words:
- nano-semiconductor material
- / SO42-/La-T-Fe2O3
- / surface structure
- / ethanol sensitivity
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