Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6065, USA.
Small. 2012 Nov 5;8(21):3283-8. doi: 10.1002/smll.201200894. Epub 2012 Aug 14.
A scanning transmission electron microscopy investigation of two nanoporous carbon materials, wood-based ultramicroporous carbon and poly(furfuryl alcohol)-derived carbon, is reported. Atomic-resolution images demonstrate they comprise isotropic, three-dimensional networks of wrinkled one-atom-thick graphene sheets. In each graphene plane, nonhexagonal defects are frequently observed as connected five- and seven-atom rings. Atomic-level modeling shows that these topological defects induce localized rippling of graphene sheets, which interferes with their graphitic stacking and induces nanopores that lead to enhanced adsorption of H(2) molecules. The poly(furfuryl alcohol)-derived carbon contains larger regions of stacked layers, and shows significantly smaller surface area and pore volume than the ultramicroporous carbon.
本文报道了两种纳米多孔碳材料（木质基超微孔碳和糠醇衍生碳）的扫描透射电子显微镜研究。原子分辨率图像表明，它们由各向同性的、褶皱的单层石墨烯片的三维网络组成。在每个石墨烯平面中，经常观察到非六边形缺陷，这些缺陷表现为相连的五元和七元环。原子级建模表明，这些拓扑缺陷会引起石墨烯片的局部起伏，从而干扰其石墨化堆叠并诱导纳米孔，从而增强对 H(2)分子的吸附。与超微孔碳相比，糠醇衍生碳含有更大的堆叠层区域，并且其比表面积和孔体积明显更小。
