摘要
通过元素分析、X射线衍射分析、Fourier变换红外光谱仪和粉末电阻率测定探讨了不同热解温度处理的热解氧化石墨的化学组成、晶体结构和电导率随热解温度的变化规律。结果表明：氧化石墨的热解过程可分为3个阶段：第Ⅰ阶段即热解温度低于180℃时，热解氧化石墨仍维持着氧化石墨的层状有序结构，但层间距迅速减小，电导率逐渐增加；第Ⅱ阶段即热解温度在180～500℃之间时，热解氧化石墨的晶体结构由氧化石墨态经由过渡态逐渐向类石墨态转变，当热解温度为500℃时完全转化为类石墨态，电导率达到最大值；第Ⅲ阶段即热解温度在500～1000℃之间时，热解氧化石墨的晶体结构为类石墨态，相比原石墨存在明显的晶粒细化现象，电导率也随着热解温度的上升而逐渐降低。
The changes of compositions, crystal structures and conductivities of pyrolytic graphite oxide （PGO） heat-treated at different temperatures were investigated by chemical elemental analysis, X-ray diffraction, Fourier transform infrared spectroscopy and conductivity measurement. The results show that there are three stages in the process of pyrolysis of graphite oxide （GO）. At the first stage, namely under 180℃, the crystal structures of PGO are still order layered structures of GO. But with the temperature rise the interlayer distance of graphite flakes becomes smaller and the conductivity increases gradually. At the second stage, namely at 180-500 ℃, the crystal structure of the PGO from GO gradually transforms into a graphite-like state via a transition state, and at 500℃ it transforms completely into a graphite-like state, and conductivity reaches the maximum. At the third stage, namely at 500-1 000℃, the crystal structure of PGO is a graphite-like state structure, with obviously refined grains of PGO. With the increase of temperature, the conductivity decreases.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第3期318-323,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50372019)资助项目。
关键词
氧化石墨
热解
晶体结构
电导率
graphite oxide
pyrolysis
crystal structure
electro-conductivity
