中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50701-050701.doi: 10.1088/1674-1056/20/5/050701

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Adsorption-controlled transition of the electrical properties realized in Hematite (alpha-Fe2O3) nanorods ethanol sensing

付星球1, 张恩迪2, 许志2, 王翀3, 王菲菲4   

  1. (1)Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China; (2)Micro-Nano Technologies Research Center, Hunan University, Changsha 410082, China; (3)School of Opto-electronic Information Science and Technology, Yantai University, Yantai 264005, China; (4)School of Physics, Ludong University, Yantai 264025, China
  • 收稿日期:2010-10-16 修回日期:2010-12-16 出版日期:2011-05-15 发布日期:2011-05-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2007CB310500), the National Natural Science Foundation of China (Grant No. 90606009), the Funds for Doctor of Yantai University, China (Grant No. WL08B8), the Funds for Doctor of

Adsorption-controlled transition of the electrical properties realized in Hematite (alpha-Fe2O3) nanorods ethanol sensing

Wang Chong(王翀)a)†, Wang Fei-Fei(王菲菲)b), Fu Xing-Qiu(付星球)c), Zhang En-Di(张恩迪)d), and Xu Zhi(许志) d)   

  1. a School of Opto-electronic Information Science and Technology, Yantai University, Yantai 264005, China; b School of Physics, Ludong University, Yantai 264025, China; c Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China; d Micro-Nano Technologies Research Center, Hunan University, Changsha 410082, China
  • Received:2010-10-16 Revised:2010-12-16 Online:2011-05-15 Published:2011-05-15
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2007CB310500), the National Natural Science Foundation of China (Grant No. 90606009), the Funds for Doctor of Yantai University, China (Grant No. WL08B8), the Funds for Doctor of Ludong University, China (Grant No. LY20082802), and the Natural Science Foundation of Hunan Province, China (Grant No. 10JJ1011).

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摘要： Alpha-Fe2O3 nanorods are synthesized through a hydrothermal method with no surfactant introduced and ethanol sensors are fabricated from these nanorods. The device can respond to ethanol vapour in a concentration range from 1 to 1500 parts per million and shows both p-type and n-type responding characteristics during the investigation of the ethanol sensing. The sensor displays a p-type characteristic when the ethanol concentration is low and converted into an n-type characteristic as the concentration exceeds a certain value. Such a phenomenon is attributed to the chemisorbed oxygen, which leads to different modifications of the energy band at the surface, namely, depletion layer or inversion layer.

关键词: adsorption, sensing, depletion, oxygen

Abstract: Alpha-Fe2O3 nanorods are synthesized through a hydrothermal method with no surfactant introduced and ethanol sensors are fabricated from these nanorods. The device can respond to ethanol vapour in a concentration range from 1 to 1500 parts per million and shows both p-type and n-type responding characteristics during the investigation of the ethanol sensing. The sensor displays a p-type characteristic when the ethanol concentration is low and converted into an n-type characteristic as the concentration exceeds a certain value. Such a phenomenon is attributed to the chemisorbed oxygen, which leads to different modifications of the energy band at the surface, namely, depletion layer or inversion layer.

Key words: adsorption, sensing, depletion, oxygen

中图分类号:  (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

  • 07.07.Df
73.63.Bd (Nanocrystalline materials) 81.07.Bc (Nanocrystalline materials)