中国物理B ›› 2009, Vol. 18 ›› Issue (9): 3985-3989.doi: 10.1088/1674-1056/18/9/061

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Highly sensitive room-temperature gas sensors based on hydrothermal synthesis of Cr2O3 hollow nanospheres

李盛, 李凤丽, 周少敏, 王鹏, 程轲, 杜祖亮   

  1. Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China
  • 收稿日期:2008-11-30 修回日期:2009-02-28 出版日期:2009-09-20 发布日期:2009-09-20
  • 基金资助:
    Project sponsored by the Program for Science \& Technology Innovation Talents in Universities of Henan Province (Grant No 2008 HASTIT002), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province of China and the National Natural Science Foundation of China (Grant No 20941002).

Highly sensitive room-temperature gas sensors based on hydrothermal synthesis of Cr2O3 hollow nanospheres

Li Sheng(李盛), Li Feng-Li(李凤丽), Zhou Shao-Min(周少敏)†, Wang Peng(王鹏), Cheng Ke(程轲), and Du Zu-Liang(杜祖亮)   

  1. Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China
  • Received:2008-11-30 Revised:2009-02-28 Online:2009-09-20 Published:2009-09-20
  • Supported by:
    Project sponsored by the Program for Science \& Technology Innovation Talents in Universities of Henan Province (Grant No 2008 HASTIT002), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province of China and the National Natural Science Foundation of China (Grant No 20941002).

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摘要： This paper reports that Cr2O3 hollow nanospheres (HNs) were synthesized via a hydrothermal approach and characterized by scanning electron microscopy, x-ray powder diffraction, transmission electron microscopy (TEM), selective area electron diffraction and high resolution TEM, respectively. In addition, the room-temperature (RT) gas sensing properties of Cr2O3 HNs and conventional powders (CPs) were investigated by means of the surface photovoltage technique. The experimental data demonstrate that the RT gas sensor of the as-fabricated HNs reaches below 5~ppm whereas that of the CPs is about 40~ppm, which results from there being much more adsorbed and desorbed oxygen in HNs than in CPs at RT. The as-prepared Cr2O3 HNs could have potential applications as RT nanosensors.

Abstract: This paper reports that Cr2O3 hollow nanospheres (HNs) were synthesized via a hydrothermal approach and characterized by scanning electron microscopy, x-ray powder diffraction, transmission electron microscopy (TEM), selective area electron diffraction and high resolution TEM, respectively. In addition, the room-temperature (RT) gas sensing properties of Cr2O3 HNs and conventional powders (CPs) were investigated by means of the surface photovoltage technique. The experimental data demonstrate that the RT gas sensor of the as-fabricated HNs reaches below 5 ppm whereas that of the CPs is about 40 ppm, which results from there being much more adsorbed and desorbed oxygen in HNs than in CPs at RT. The as-prepared Cr2O3 HNs could have potential applications as RT nanosensors.

Key words: Cr2O3, hollow nanospheres, gas sensing, surface photovoltage

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

  • 07.07.Df
61.05.cp (X-ray diffraction) 68.37.Hk (Scanning electron microscopy (SEM) (including EBIC)) 68.37.Lp (Transmission electron microscopy (TEM)) 81.16.-c (Methods of micro- and nanofabrication and processing)