Long-range ordered porous carbons produced from C_60
Long-range ordered porous carbons produced from C_60
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DOI：
10.1038/s41586-022-05532-0
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发表时间：
2023-01
期刊：
影响因子：
64.8
通讯作者：
Fei Pan;Kun Ni;T. Xu;Huaican Chen;Yusong Wang;Ke Gong;Cai Liu;X. Li;Miao‐Ling Lin;
中科院分区：
文献类型：
--
作者：
Fei Pan;Kun Ni;T. Xu;Huaican Chen;Yusong Wang;Ke Gong;Cai Liu;X. Li;Miao‐Ling Lin;
已经报道了具有连接C60分子的共价键的碳结构，但是它们的生产方法通常导致非常少量的样品，这限制了潜在应用所需的详细表征和探索。本文报道了以C_（60）粉末为原料，α-Li_3 N为催化剂，在常压下制备出一种新型炭材料--长程有序多孔炭（LOPC）。LOPC由连续的断裂的C60笼组成，保持长程周期性，并已通过X射线衍射，拉曼光谱，魔角旋转固体核磁共振光谱，像差校正透射电子显微镜和中子散射表征。基于神经网络的数值模拟表明，LOPC是一种亚稳态结构的富勒烯型碳转化为石墨烯型碳。在较低的温度、较短的退火时间或使用较少的α-Li 3 N时，由于电子从α-Li 3 N转移到C60，形成了众所周知的聚合C60晶体。碳的K边近边X射线吸收精细结构表明，LOPC中的电子离域程度高于C60（s）。室温下的电导率为1.17 × 10−2S cm− 1，在T < 30 K时的传导似乎是由短距离的类金属输运与载流子跳跃的结合造成的。LOPC的制备使得能够发现从C60（s）开始的其他结晶碳。
Carbon structures with covalent bonds connecting C60molecules have been reported, –, but their production methods typically result in very small amounts of sample, which restrict the detailed characterization and exploration necessary for potential applications. We report the gram-scale preparation of a new type of carbon, long-range ordered porous carbon (LOPC), from C60powder catalysed by α-Li3N at ambient pressure. LOPC consists of connected broken C60cages that maintain long-range periodicity, and has been characterized by X-ray diffraction, Raman spectroscopy, magic-angle spinning solid-state nuclear magnetic resonance spectroscopy, aberration-corrected transmission electron microscopy and neutron scattering. Numerical simulations based on a neural network show that LOPC is a metastable structure produced during the transformation from fullerene-type to graphene-type carbons. At a lower temperature, shorter annealing time or by using less α-Li3N, a well-known polymerized C60crystal forms owing to the electron transfer from α-Li3N to C60. The carbon K-edge near-edge X-ray absorption fine structure shows a higher degree of delocalization of electrons in LOPC than in C60(s). The electrical conductivity is 1.17 × 10−2S cm−1at room temperature, and conduction atT< 30 K appears to result from a combination of metallic-like transport over short distances punctuated by carrier hopping. The preparation of LOPC enables the discovery of other crystalline carbons starting from C60(s).