Effect of end group of amorphous perfluoro-polymer electrets on electron trapping

Science and Technology of Advanced Materials

Ai Sugie¹  Hiroyuki Yoshida¹  Yuji Suzuki²  Kuniko Suzuki²  Seonwoo Kim²  Masafumi Yoshida³ 

[1] Chiba University;The University of Tokyo;Tokyo City University;

关键词: Electret;    fluorinated polymer;    CYTOP;    density functional theory;    low-energy inverse photoelectron spectroscopy (LEIPS);    electron affinity (EA);   

DOI  :  10.1080/14686996.2018.1477395

来源: DOAJ

【 摘 要 】

Charge trap in amorphous perfluoro-polymer electret is studied, focusing on electron trap site and trap energy. Low-energy inverse photoelectron spectroscopy is adopted to measure solid-state electron affinity (EA) of cyclic transparent optical polymer (CYTOP). EA of CYTOP CTL-S is discovered by compensating the unwanted charge-up effect. Negatively-charged electret materials (polyethylene, ethylene-tetra-fluoro-ethylene, poly-tetra-fluoro-ethylene, and CYTOP) are analyzed by quantum mechanical calculation. Density functional theory with long-range correction is adopted to analyze orbital energies of single molecular systems. Intramolecular distribution of trapped electron and EA are investigated. Calculated electron affinities of CYTOP polymers with different end group are qualitatively in accordance with trapped charge stability measured with thermal stimulated discharge, signifying that electron affinities obtained with the present simulation can be used as an index of amorphous polymer electret.

【 授权许可】

Unknown