1. Institute of Electrical Engineering, Chinese Academy of Sciences Beijing 100190 China2. Graduate University of Chinese Academy of Sciences Beijing 100039 China 3. State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China
Abstract：Study of characteristics and application of dielectric barrier discharge (DBD) excited by unipolar nanosecond pulse are presented in this paper. Characteristics of unipolar nanosecond-pulse DBD in atmospheric air are investigated using electrical measurement and discharge photograph, and homogeneous discharge is obtained under certain conditions, and the influence of discharge characteristics and uniform of DBD dependent on air gap spacing are analyzed. Furthermore, surface treatment of polyimide films using the homogeneous DBDs is studied. The change of chemical and physical modification of the surface before and after plasma processing is evaluated according to static angle measurement, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS), which is compared with the effect of filamentary DBDs treatment. Results show that the measured discharge current exhibits bipolar pulses and the discharge current, electric barrier voltage and discharge power decrees with the gap spacing and the homogeneous DBD can be obtained under narrow gap spacing. In addition, both surface morphology and chemical composition of polyimide films are modified, and the modification includes the rise of hydrophilicity, surface oxidation and the enhancement of surface roughness, and homogeneous DBD can modify the surface more uniformly than filamentary DBD.
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2010, Vol. 25 
