Preparation and characterization of alkylamine-intercalated graphite oxides
Preparation and characterization of alkylamine-intercalated graphite oxides
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DOI：
10.1016/j.carbon.2006.12.023
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发表时间：
2007-04-01
期刊：
影响因子：
10.9
通讯作者：
Sugie, Yosohiro
中科院分区：
文献类型：
--
作者：
Matsuo, Yoshiaki;Miyabe, Tadaaki;Sugie, Yosohiro
在少量正己烷存在下，合成了各种正烷基胺插层氧化石墨氧化物，并对其组成、化学键和烷基链的取向进行了表征。当氧化石墨中含有约11 mmol/g的正十六胺时，氧化石墨层间空间达到饱和。红外和X射线光电子能谱分析表明，GO插层化合物中含有3种烷基胺，即氢键中性胺、氢键质子化胺和离子结合质子化胺。在这些物种之间建立了平衡。正十六胺饱和的GO在乙醇中浸泡会导致胺的脱嵌，其残留胺的量为3.0 mmol/g，与3.5 mmol/g的GO中的易交换质子的脱插量相当。当烷基链长变短时，由于烷基链间疏水作用不足，所得插层化合物的烷基胺含量减少。X-射线衍射和偏光红外光谱数据表明，对于较小的层间距和较大的层间距，烷基胺的烷基链分别呈交错的单层和双层取向。(C)2006爱思唯尔有限公司。保留所有权利。
Various n-alkylamine-intercalated graphite oxides were synthesized in the presence of a small amount of hexane and their compositions, chemical bonding and orientation of alkyl chains in them were characterized. The interlayer space of graphite oxide was saturated when about 11 mmol/g of n-hexadecylamine was included in it. Three types of alkylamines in GO were identified in the resulting intercalation compounds, hydrogen-bonded neutral amines, hydrogen-bonded protonated amines and ionically bound protonated amines, based on the infrared and XPS studies. The equilibrium between these species was established. Immersion of GO saturated by n-hexadecylamine in ethanol resulted in the de-intercalation of amines and the amount of residual amines was 3.0 mmol/g, which was rather similar to that of readily exchangeable protons in GO of 3.5 mmol/g. When alkyl chain length became shorter, the resulting intercalation compounds contained less alkylamine due to insufficient hydrophobic interaction between alkyl chains. The X-ray diffraction and polarized-infrared spectroscopic data indicated that alkyl chains of alkylamines took interdigitated monolayer and bilayer orientations for smaller and larger interlayer spacings, respectively. (c) 2006 Elsevier Ltd. All rights reserved.