Preparation and EPR characterization of N@C60 and N@C70 based peapods
Preparation and EPR characterization of N@C60 and N@C70 based peapods
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N@C60 和 N@C70 基豌豆的制备和 EPR 表征
DOI：
10.1063/1.2103878
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发表时间：
2005
影响因子：
--
通讯作者：
K. Dinse
中科院分区：
文献类型：
--
作者：
B. Corzilius;A. Gembus;N. Weiden;K. Dinse
利用包裹氮原子的四重自旋作为电子顺磁共振（EPR）探针，可以检查豆荚中富勒烯/纳米管的相互作用。开发了一种纯化方法，允许用内嵌富勒烯低温填充纳米管。未掺杂单壁碳纳米管 (SWNT) 的顺磁杂质通过 EPR 进行表征，导致剩余催化剂颗粒的宽超顺磁信号和碳质材料的相当窄的信号。几种氮内嵌掺杂豆荚的 EPR 光谱与其在固体富勒烯基质中获得的类似物的比较显示 N@C60 和 N@C70 EPR 信号显着展宽。这种展宽与封装时富勒烯笼变形引起的非消失零场分裂有关。
Using the quartet spin of encased nitrogen atoms as an electron paramagnetic resonance (EPR) probe, it is possible to examine the fullerene/nanotube interactions in a peapod. A purification method is developed which allows low temperature filling of nanotubes with endohedral fullerenes. The paramagnetic impurities of undoped single wall carbon nanotubes (SWNT) are characterized via EPR resulting in a broad superparamagnetic signal of the remaining catalyst particles and a rather narrow signal of carbonaceous material. Comparison of EPR spectra of several nitrogen endohedral doped peapods with their analogues obtained in a solid fullerene matrix shows a significant broadening of N@C60 and N@C70 EPR signals. This broadening is related to a non‐vanishing zero‐field splitting caused by deformation of the fullerene cage upon encapsulation.