Surface free-carrier screening effect on the output of a ZnO nanowire nanogenerator and its potential as a self-powered active gas sensor.

@article{Xue2013SurfaceFS,
  title={Surface free-carrier screening effect on the output of a ZnO nanowire nanogenerator and its potential as a self-powered active gas sensor.},
  author={Xinyu Xue and Yuxin Nie and Bin He and Lili Xing and Yan Zhang and Zhong Lin Wang},
  journal={Nanotechnology},
  year={2013},
  volume={24 22},
  pages={
          225501
        }
}
The output of a piezoelectric nanogenerator (NG) fabricated using ZnO nanowire arrays is largely influenced by the density of the surface charge carriers at the nanowire surfaces. Adsorption of gas molecules could modify the surface carrier density through a screening effect, thus, the output of the NG is sensitive to the gas concentration. Based on such a mechanism, we first studied the responses of an unpackaged NG to oxygen, H2S and water vapor, and demonstrated its sensitivity to H2S to a… 
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