Acta scientiarum naturalium Universitatis Pekinensis
TAO Xiong, ZHANG Zhaoxiang, WANG Mingsheng, WU Yue, ZHANG Gengmin
A tungsten tip received discharge treatment under a high voltage over 10kV in a field-emission microscope (FEM). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation showed that some nanometer-scale protrusions resulted from the discharge treatment. The post-treatment tungsten tip delivered a field emission current as high as 1.55mA. The FEM pattern of the tip demonstrated a four-fold symmetry and thus the field emission was attributed to a single protrusion. The dependence of the field emission current on the applied voltage approximately followed the Fowler-Nordheim (F-N) theory. The value of the emission area calculated by the F-N theory is in agreement with that obtained from the TEM observation in the order of magnitude.
TAO Xiong,ZHANG Zhaoxiang,WANG Mingsheng,WU Yue,ZHANG Gengmin. Field Emission Properties of a Tungsten Tip after Discharge Treatment[J].Acta scientiarum naturalium Universitatis Pekinensis, 2006, 42(3): 385-387.
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