Electrical properties and structural characterizations of polyphenylquinoxaline pyrolyzed at high temperature
文献类型：期刊论文
| 作者 | Piao, MJ; Wan, MX; Lu, FC |
| 刊名 | JOURNAL OF APPLIED POLYMER SCIENCE
 |
| 出版日期 | 1998-07-05 |
| 卷号 | 69期号:1页码:123-128 |
| 关键词 | Polyphenylquinoxaline Pyrolysis Electrical Conductor |
| ISSN号 | 0021-8995 |
| 英文摘要 | Insulating polyphenylquinoxaline (PPQ) was converted into an electrical conductor by pyrolysis at high temperature in nitrogen. Room temperature conductivity was measured as a function of pyrolytic conditions, and it was found that it strongly depends on the pyrolytic temperature and time. A maximum of room temperature conductivity about 177 S cm(-1) for PPQ film pyrolyzed at 1200 degrees C for 1 h was obtained, which is 18 orders of magnitude greater than that of the original PPQ film. The current voltage (I-V) curve of pyrolyzed PPQ films follows Ohm's law characteristics of metals. Anisotropy in conductivity along and perpendicular to the surface of the film indicates the formation of a graphite-like structure in pyrolyzed PPQ films. The structure of the pyrolyzed PPQ films was investigated by elemental analysis, X-ray photoelectron spectroscopy spectra, X-ray diffraction, and scanning electron microscopic image. The electrical property and the structural characterizations suggest that the pyrolysis of PPQ films consists of two processes (i.e., carbonization and graphitization), and the critical temperature is at about 800 degrees C. During carbonization (T-p < 800 degrees C), some H, N, and O atoms are removed and the temperature dependence of conductivity of pyrolyzed PPQ film can be expressed by the three-dimensional Variable-Range Hopping (3-D VRH) model. During graphitization (T-p > 800 degrees C), most H, N, and O atoms are removed from the residue, and a polyconjugated structure forms in it. The temperature dependence of conductivity deviates somewhat from the 3-D VRH model and can befitted with a modified 3-D VRH model. (C) 1998 John Wiley & Sons, Inc. |
| 语种 | 英语 |
| WOS记录号 | WOS:000073642500014 |
| 出版者 | JOHN WILEY & SONS INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/74309]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wan, MX |
| 作者单位 | Acad Sinica, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Piao, MJ,Wan, MX,Lu, FC. Electrical properties and structural characterizations of polyphenylquinoxaline pyrolyzed at high temperature[J]. JOURNAL OF APPLIED POLYMER SCIENCE,1998,69(1):123-128. |
| APA | Piao, MJ,Wan, MX,&Lu, FC.(1998).Electrical properties and structural characterizations of polyphenylquinoxaline pyrolyzed at high temperature.JOURNAL OF APPLIED POLYMER SCIENCE,69(1),123-128. |
| MLA | Piao, MJ,et al."Electrical properties and structural characterizations of polyphenylquinoxaline pyrolyzed at high temperature".JOURNAL OF APPLIED POLYMER SCIENCE 69.1(1998):123-128. |
入库方式： OAI收割
来源：化学研究所
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