Spectral analysis of the emission current noise exhibited by few layer WS2 nanosheets emitter

Spectral analysis of the field emission (FE) current fluctuations has been carried out at the base pressure ~1×10−8mbar. The emission current stability investigated at preset value of 2µA is characterized by ‘step’ like fluctuation. The spectral analysis performed on a FFT (Fast Fourier Transform) a...

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Bibliographic Details
Published in:Ultramicroscopy 2015-02, Vol.149, p.51-57
Main Authors: Suryawanshi, Sachin R., Kolhe, Pankaj S., Rout, Chandra S., Late, Dattatray J., More, Mahendra A.
Format: Article
Language:English
Subjects:
Current fluctuations
Emission analysis
Emittance
Field emission
Fluctuation
Nanostructure
Noise
Spectral emissivity
Surface chemistry
WS2 nanosheets
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Summary:Spectral analysis of the field emission (FE) current fluctuations has been carried out at the base pressure ~1×10−8mbar. The emission current stability investigated at preset value of 2µA is characterized by ‘step’ like fluctuation. The spectral analysis performed on a FFT (Fast Fourier Transform) analyzer revealed that the observed noise is of 1/fα type, with the value of α as ~1.05. The estimated value of α implies that the current fluctuations are mainly due the various processes occurring on atomic scale like adsorption, migration, and/or desorption of the residual gas species on the emitter surface. [Display omitted]
ISSN:0304-3991
1879-2723
DOI:10.1016/j.ultramic.2014.10.004