A quantitative analysis of carbon edge sites and an estimation of graphene sheet size in high-temperature treated, non-porous carbons
A quantitative analysis of carbon edge sites and an estimation of graphene sheet size in high-temperature treated, non-porous carbons
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DOI：
10.1016/j.carbon.2014.08.048
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发表时间：
2014-12-01
期刊：
影响因子：
10.9
通讯作者：
Kyotani, Takashi
中科院分区：
文献类型：
--
作者：
Ishii, Takafumi;Kashihara, Susumu;Kyotani, Takashi
通过使用非石墨化和石墨化的碳制备的聚（糠醇）和聚（氯乙烯），分别，试图通过分析它们的氢含量和表面氧络合物和本地化的自旋的量来确定碳边缘网站的数量。据发现，在目前的制备条件下，无论碳的类型和热处理温度如何，氢封端的边缘的数量远高于表面氧络合物的数量，但是当热处理温度较高时，来自封闭空间中的σ自由基和/或三重态卡宾/碳炔物种的局部自旋的贡献可能变得与氢含量相当。此外，在这些碳中的石墨烯层的平均尺寸估计从边缘站点的总数。这种分析表明，在聚（糠醇）衍生的碳的实际大小是远远大于用透射电子显微镜检测到的大小。这种大的差异是讨论有关的一个真实的结构的石墨烯层在不可石墨化的碳。(C)2014爱思唯尔有限公司版权所有。
By using non-graphitizable and graphitizable carbons prepared from poly(furfulyl alcohol) and poly(vinyl chloride), respectively, an attempt is made to determine the number of carbon edge sites by analyzing their hydrogen content and the amounts of surface oxygen complexes and localized spins. It is found that, at the present preparation conditions, the number of hydrogen-terminated edges is much higher than the number of surface oxygen complexes regardless of the type of carbon and the heat-treatment temperature, but the contribution of the localized spins derived from sigma free radicals in closed spaces and/or triplet carbene/carbyne species may become comparable to the hydrogen content when the heat-treatment temperature is higher. Moreover, the average sizes of graphene layers in these carbons are estimated from the total number of edge sites. This analysis suggests that the actual size in the poly(furfulyl alcohol)-derived carbons is much larger than the size detected with transmission electron microscopy. This large difference is discussed in relation to a real structure of graphene layers in non-graphitizable carbons. (C) 2014 Elsevier Ltd. All rights reserved.