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氧化石墨是石墨的氧化产物,由于它的碳层表面引入了很多极性功能团,使得很多分子都能够嵌入其层间形成纳米复合物,但也正是这些功能团使得它散失了石墨良好的导电性。为了考察氧化石墨受热处理后还原的可能性,通过X 射线衍射、扫描电镜、红外光谱分析以及元素分析等手段研究了氧化石墨在不同热处理条件下的结构变化。研究发现热处理时的升温速度对氧化石墨的结构影响很大,快速升温时,氧化石墨迅速分解,发生膨胀形成类似于膨胀石墨的含有丰富的50nm至5μm左右孔洞的一种结构;而当缓慢升温时,氧化石墨随着热处理温度的升高,逐渐恢复成类似于石墨的结构,同时电导率也随热处理温度的升高而提高,当热处理温度高于180℃时,电导率大于1S/cm。这些结果表明利用氧化石墨作为前驱体,通过先制备聚合物/氧化石墨纳米复合物后经热处理来得到导电性的聚合物/碳纳米复合材料是可行的。
Graphite oxide is an oxidation product of graphite. Due to the introduction of many polar functional groups on the surface of its carbon layer, many molecules can be embedded into the layers to form nanocomposites. However, these functional groups make it lose the good graphite Conductivity. In order to investigate the possibility of graphite oxide reduction after heat treatment, the structural changes of graphite oxide under different heat treatment conditions were studied by means of X-ray diffraction, scanning electron microscopy, infrared spectroscopy and elemental analysis. The results show that the rate of heating during heat treatment has a great influence on the structure of graphite oxide. When the temperature is rapidly increased, the graphite oxide decomposes rapidly and expands to form a structure rich in pores of about 50 nm to 5 μm, which is similar to expanded graphite. , Graphite oxide gradually recovered to a graphite-like structure with the increase of heat treatment temperature. Meanwhile, the conductivity of graphite oxide increased with the increase of heat treatment temperature. When the heat treatment temperature was higher than 180 ℃, the conductivity was more than 1S / cm. These results indicate that it is feasible to obtain a conductive polymer / carbon nanocomposite by thermal treatment of a polymer / graphite oxide nanocomposite using graphite oxide as a precursor.