Mechanisms of surface charge dissipation of silicone rubber enhanced by dielectric barrier discharge plasma treatments
This paper investigates mechanisms of the surface charge dissipation of silicone rubber (SiR) after dielectric barrier discharge (DBD) plasma treatments in an open air. Electrical and physicochemical properties of the untreated and plasma treated samples were evaluated by surface and volume conducti...
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Veröffentlicht in: | Journal of applied physics 2019-09, Vol.126 (9) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | This paper investigates mechanisms of the surface charge dissipation of silicone rubber (SiR) after dielectric barrier discharge (DBD) plasma treatments in an open air. Electrical and physicochemical properties of the untreated and plasma treated samples were evaluated by surface and volume conductivity, surface potential decay (SPD) measurements, Fourier transform infrared (FT-IR), and water contact angle tests. Results show that the surface conductivity of the plasma treated samples evidently increases with the treatment time. The samples with a longer DBD plasma treatment time enhance the SPD rate after the positive and negative corona charging. However, an abnormal surface potential variation is observed at the beginning of the SPD after the negative corona charging. It is found that the top-bottom surface plasma treatment can further accelerate the SPD of the samples compared with the untreated and single surface plasma treated samples. The physicochemical analysis shows that the concentration of polar groups is increased after the plasma treatment, and the water contact angle is consistently declined with the increase of the plasma treatment time. The calculated trap distribution illustrates that the hole trap energy and the electron trap density of the sample are decreased after the plasma treatments. This investigation attributes the measured SPD of the untreated sample and single surface treated samples to the electrical conduction along the sample surface, but the SPD of the top-bottom surfaces plasma treated samples is enhanced by the charge neutralization and transportation through the material bulk as well as the sample top surface conduction. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.5110615 |