高分辨透射电子显微镜（HRTEM），X射线衍射（XRD）和拉曼光谱揭示了一个多面体多壳富勒烯类结构的astralen碳纳米粒子。多面体由大的平面石墨面连接的缺陷边缘区域，大概五边形的结构。这些面包括20-50个平面石墨烯片的堆叠，片间距离为~ 0.340 nm。颗粒的平均尺寸和它们的平面分别为~ 40 nm和~ 15 nm。阿斯塔伦粒子被认为具有无缺陷的sp^2平面，所有缺陷都聚集在它们的多面体边缘。多晶astralen样品的电子顺磁共振（EPR）谱揭示了两个组成部分：一个非常宽的信号与DHpp > 1 T和一个不对称的窄中心接近g = 2.00。后者由两条重叠的洛伦兹线组成。所有光谱分量都与环境压力无关。从T = 300 K降到4 K时，EPR信号强度没有变化，证明了泡利顺磁性。电子自旋-晶格弛豫时间T1 e在相同的温度范围内保持非常短。温度依赖的13 C核磁共振？共振（NMR）测量得到核自旋-晶格弛豫时间T1 n ~ T^-0.612。Astralen的T1 n（T）依赖性指数介于金属行为T1 n ~ T^-1（柯林加关系）和半导体行为T1 n ~T^-0.5之间。astralen所有不寻常的磁共振特征都归因于离域的载流子，其数量大大超过了多壳层多面体边缘缺陷中的自旋。
英文摘要：
High Resolution Transmission Electron Microscopy (HRTEM), X-ray Diffraction (XRD) and Raman spectroscopy reveal a polyhedral multi-shell fullerene-like structure of astralen carbon nanoparticles. The polyhedra consist of large flat graphitic faces connected by defective edge regions with presumably pentagon-like structure. The faces comprise a stacking of 20-50 planar graphene sheets with inter-sheet distance of ~ 0.340 nm. Average sizes of the particles and their flat faces are ~ 40 nm and ~ 15 nm, respectively. The astralen particles are suggested to have defect-free sp^2 flat faces and all defects condense at their polyhedral edges. Electron Paramagnetic Resonance (EPR) spectra of polycrystalline astralen samples reveal two components: a very broad signal with DHpp > 1 T and an asymmetric narrow one centered close to g = 2.00. The latter consists of two overlapping Lorentzian lines. All spectral components are independent of ambient pressure. The intensities of all EPR signals show no changes on decreasing temperature from T = 300 K down to 4 K demonstrating the Pauli paramagnetism. Electron spin-lattice relaxation times T1e remain very short within the same temperature range. Temperature dependent 13C Nuclear Magneti? Resonance (NMR) measurements yield nuclear spin-lattice relaxation times T1n ~ T^-0.612. The exponent in the T1n(T)-dependence for astralen falls between the metallic behavior, T1n ~ T^-1 (Korringa relation), and the semiconductor behavior, T1n ~T^-0.5. All unusual magnetic resonance features of astralen are attributed to delocalized charge carriers which amount considerably exceeds that of spins localized in defects on multi-shell polyhedra edges.
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Università degli Studi di Napoli Federico II（那不勒斯费德里科二世大学）；Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili, Consiglio Nazionale delle Ricerche（意大利国家研究委员会可持续能源与交通科学和技术研究所）；Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Capodimonte（卡波迪蒙特国家天体物理研究所天文台）；NEST, Istituto Nanoscienze - CNR, and Scuola Normale Superiore（纳米科学研究所-意大利国家研究委员会，以及比萨高等师范学院）
Carbon encapsulation of levitated Au nanoparticles
University of Maryland, College Park（马里兰大学帕克分校）；Laboratory for Physical Sciences（物理科学实验室）；Joint Quantum Institute, University of Maryland, College Park（马里兰大学帕克分校联合量子研究所）
