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.
Received: 30 November 2008
Revised: 28 February 2009
Accepted manuscript online:
(Methods of micro- and nanofabrication and processing)
Fund: 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).
Cite this article:
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) Highly sensitive room-temperature gas sensors based on hydrothermal synthesis of Cr2O3 hollow nanospheres 2009 Chin. Phys. B 18 3985
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