Characterization of graphite oxide after heat treatment
Characterization of graphite oxide after heat treatment
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热处理后氧化石墨的表征
DOI：
10.1039/c2nj20833d
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发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
Chen, Han
中科院分区：
文献类型：
--
作者：
Hu, Zhongliang;Chen, Yifeng;Chen, Han
将氧化石墨 (GO) 在 N-2 气体环境中加热至 120 ℃、140 ℃、160 ℃、200 ℃ 和 600 ℃，并通过 X 射线衍射、红外 (IR) 光谱、热重分析 (TG)、差热分析 (DTA)、元素分析和阳离子交换容量 (CEC) 测试对加热的样品进行研究。结果发现，当加热温度升高到160℃时，层间距离减小，并且当加热到200℃和600℃时，GO塌陷形成石墨。红外分析表明，在120℃时仅损失水，在160℃时含氧基团（OCG）分解，在200℃或以上时，除了少数OH基团外，几乎所有OCG都消失。 TG/DTA分析表明，当GO在600℃加热时，已经形成了部分石墨烯片。CEC测试推断，GO中的OCG在140℃以下仍能良好保存，并且本研究中GO的分解温度为140-160℃，元素分析也支持了这一点。
Graphite oxide (GO) was heated at 120 degrees C, 140 degrees C, 160 degrees C, 200 degrees C and 600 degrees C in ambient N-2 gas and the heated samples were investigated by X-ray diffraction, infrared (IR) spectroscopy, thermal gravimetry (TG), differential thermal analysis (DTA), elemental analysis and cation exchange capacity (CEC) tests. It was found that the interlayer distance decreases upon increasing the heating temperature up to 160 degrees C, and GO collapses to form graphite when heated at 200 degrees C and 600 degrees C. IR analyses showed that at 120 degrees C only water is lost, at 160 degrees C oxygen-containing groups (OCGs) decompose and at 200 degrees C or above almost all OCGs disappear except a few of the OH groups. TG/DTA analysis showed that a part of graphene sheets have been formed when GO is heated at 600 degrees C. CEC tests inferred that OCGs in GO are well preserved up to 140 degrees C, and the decomposition temperature of GO in this study is 140-160 degrees C, which is supported by the elemental analysis.