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Citation: LIN De-Juan, SHE Shui-Fa, CHEN Nai-Sheng, HUANG Jin-Ling. The Surface Structure of Nano-semiconductor SO₄^2-/La-α-Fe₂O₃ and Sensitivity to Ethanol[J]. Chinese Journal of Applied Chemistry, ;2002, 19(10): 972-975. shu

The Surface Structure of Nano-semiconductor SO₄^2-/La-α-Fe₂O₃ and Sensitivity to Ethanol

1.
a Department of Chemistry, Zhangzhou Teachers College, Zhangzhou 363000;
2.
b Research Institute of Functional Materials, Fuzhou University, Fuzhou

Corresponding author: LIN De-Juan,
Received Date: 5 February 2002
Available Online: 29 May 2002
Fund Project: 福建省科委(98-H-13) (98-H-13)福建省高校(JA00232)资助项目 (JA00232)

Nano-semiconductive material SO₄^2-/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 SO₄^2- is combined with Fe³⁺ of La-T-Fe₂O₃ through an inorganic bridge structure. Addition of SO₄^2- makes the binding energy of Fep_1/3 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 SO₄^2-/La-T-Fe₂O₃, calcinated at 450℃ showed sensitivity of 35.7 to ethyl alcohol and good stability.
- nano-semiconductor material,
- SO₄^2-/La-T-Fe₂O₃,
- surface structure,
- ethanol sensitivity
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The Surface Structure of Nano-semiconductor SO₄^2-/La-α-Fe₂O₃ and Sensitivity to Ethanol