Decay of Free Radicals in Polycarbosilane Induced by gamma-Rays Irradiation
Cheng, Y; Li, XH; Liu, WH; Wu, GZ; Wang, MH; Wang, MH (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
2016
发表期刊CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN0251-0790
卷号37期号:3页码:595—599
文章类型期刊文献
摘要The formation and decay behavior of the free radicals trapped in polycarbosilane (PCS) induced by gamma-rays irradiation in N-2 were investigated by electron spin resonance (ESR). ESR analysis showed that the trapped radicals induced by gamma-rays irradiation were assigned to Si radicals ( Si center dot "). The concentration of free radicals increased with absorbed dose linearly at the lower dose, and the G value of the radical formation was calculated to be 9. However, the concentration of free radicals tends to be saturated when the absorbed dose reached 200 kGy. Upon storage in N-2 at ambient temperature the free radicals decayed slowly with a half-life of 23 d. On the contrary, the free radicals decayed rapidly after the sample was exposed to air due to their oxidation, the half-life was only 8 h. The rate of radical decay was accelerated by annealing at elevated temperature, the free radicals trapped in PCS could be removed thoroughly after heating up to 250 degrees C in N-2.
关键词Silicon-carbide Conversion Esr
DOI10.7503/cjcu20150705
收录类别SCI
语种英语
WOS记录号WOS:000372872300028
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/25678
专题中科院上海应用物理研究所2011-2018年
通讯作者Wang, MH (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
推荐引用方式
GB/T 7714
Cheng, Y,Li, XH,Liu, WH,et al. Decay of Free Radicals in Polycarbosilane Induced by gamma-Rays Irradiation[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2016,37(3):595—599.
APA Cheng, Y,Li, XH,Liu, WH,Wu, GZ,Wang, MH,&Wang, MH .(2016).Decay of Free Radicals in Polycarbosilane Induced by gamma-Rays Irradiation.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,37(3),595—599.
MLA Cheng, Y,et al."Decay of Free Radicals in Polycarbosilane Induced by gamma-Rays Irradiation".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 37.3(2016):595—599.
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