摘要
用X射线光电子能谱（XPS）技术分析了由PAN（聚丙烯腈）薄膜所制得的炭膜中碳、氮和氧三种元素的结合状态。在PAN原膜中C1s峰、N1s峰和O1s峰的结合能分别为284．6ev、399．4ev和531．75ev。在整个热解过程中，样品中的C、N和O结构的功能团和转变的变化已被测定出。随着热解温度的提高，样品表面存在着不同化学状态的碳和不同形式的含氧基因，以及由单一氨结构转变为更加稳定地不同化学态的氮结构的形式。而且，在210℃氧化热解后样品表面的碳含量和氧及氮的含量分别降低20％和增加6％及14％；在氮气流中氧化热解后的样品随热解炭化温度的增加其表面的氮含量一直处于下降状态，在N／C比值也随炭化热解温度的增加而减小的同时，对样品在不同温度下所得到的C1s、O1s和N1s峰进行了曲线拟合分峰处理和所得实验结果进行了推理性的讨论。
The binding states of three typical elements of carbon. nitrogen and oxygen in carbon film prepared from the polyacrylonitrile (PAN ) film were analyzed by using X ray photoelectron spectroscopic technique. The binding energies of Cls, Nls and Ols peaks in PAN original film measured to be 284. 6ev, 399. 4ev and 531. 75ev respectively. The groups of the containing-carbon, nitrogen and oxygen structures and the convertible changes of which in sample were measured during whole pyrolysis. As the pyrolytic temperature raised the different chemical state carbons and the different form containing oxygen groups existed in sample surface. and the forms of the more stable nitrogen structure of the different chemical states transformed from a single nitrogen also existed in sample surface. Furthermore. the contents of carbon, nitrogen and oxygen on the surface of sample oxidate-pyrolyzed at 21℃ were decreased by^20% and increased by^6%. and ~ 14% respectjvely, As the pyrolytic carbonization temperature raised the content of nitrogen on the surface of sample oxidate-pyrolyzed in N2 was the decreasing state straightly. the value of ratio N /C decroased with increasing pyrolysis temperature.Simultaneously, For Cls, Ols and Nls peaks of the sample obtained at different temperature ttie treatments of Cls, Ols and Nls peaks of the curve fitting peak processing and the reasoning discussion on the obtaining experimental results.
出处
《炭素》
1997年第4期1-6,共6页
Carbon
