Gas-sensing properties of hollow and hierarchical copper oxide microspheres
Zhang, YangHe, XiuliLi, JianpingZhang, HuigangGao, Xiaoguang
Abstract
Novel microgas sensors based on hollow and hierarchical copper oxide microspheres are fabricated and their gas-sensing properties are researched. The copper oxide microspheres are characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) after being annealed at 300 degrees C, 500 degrees C and 700 degrees C. The experimental results show that the microspheres have large response, fast response/recovery rate and good stability. The detection limits toward CO and C2H5OH of the microspheres annealed at 700 degrees C are below 1 ppm and 100 ppb, respectively. There is no obvious change in resistance and response within I month. (c) 2007 Elsevier B.V. All rights reserved.
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